From 90b9222ec632bc8b262981768c7b16f7e67dfe58 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Mon, 12 Dec 2011 09:24:40 +0100
Subject: ARM: 7199/2: only look for TCM on ARMv5 and later

The Integrator AP/CP can have a varying set of core modules, some
(like ARM920T) are so old that trying to read the TCM status register
with CP15 will make them hang. So we need to make sure that we are
running on v5 or later in order to be able to activate this for
the Integrator. (The Integrator with CM926EJ-S has 32+32 kb of TCM
memory.)

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/tcm.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/tcm.c b/arch/arm/kernel/tcm.c
index 30e302d33e0a..01ec453bb924 100644
--- a/arch/arm/kernel/tcm.c
+++ b/arch/arm/kernel/tcm.c
@@ -180,9 +180,9 @@ static int __init setup_tcm_bank(u8 type, u8 bank, u8 banks,
  */
 void __init tcm_init(void)
 {
-	u32 tcm_status = read_cpuid_tcmstatus();
-	u8 dtcm_banks = (tcm_status >> 16) & 0x03;
-	u8 itcm_banks = (tcm_status & 0x03);
+	u32 tcm_status;
+	u8 dtcm_banks;
+	u8 itcm_banks;
 	size_t dtcm_code_sz = &__edtcm_data - &__sdtcm_data;
 	size_t itcm_code_sz = &__eitcm_text - &__sitcm_text;
 	char *start;
@@ -191,6 +191,22 @@ void __init tcm_init(void)
 	int ret;
 	int i;
 
+	/*
+	 * Prior to ARMv5 there is no TCM, and trying to read the status
+	 * register will hang the processor.
+	 */
+	if (cpu_architecture() < CPU_ARCH_ARMv5) {
+		if (dtcm_code_sz || itcm_code_sz)
+			pr_info("CPU TCM: %u bytes of DTCM and %u bytes of "
+				"ITCM code compiled in, but no TCM present "
+				"in pre-v5 CPU\n", dtcm_code_sz, itcm_code_sz);
+		return;
+	}
+
+	tcm_status = read_cpuid_tcmstatus();
+	dtcm_banks = (tcm_status >> 16) & 0x03;
+	itcm_banks = (tcm_status & 0x03);
+
 	/* Values greater than 2 for D/ITCM banks are "reserved" */
 	if (dtcm_banks > 2)
 		dtcm_banks = 0;
-- 
cgit v1.2.3


From 0c9030deaf59d444f9e757ee73d6d81bfe2d3376 Mon Sep 17 00:00:00 2001
From: Leif Lindholm <leif.lindholm@arm.com>
Date: Mon, 12 Dec 2011 19:31:55 +0100
Subject: ARM: 7206/1: Add generic ARM instruction set condition code checks.

This patch breaks the ARM condition checking code out of nwfpe/fpopcode.{ch}
into a standalone file for opcode operations. It also modifies the code
somewhat for coding style adherence, and adds some temporary variables for
increased readability.

Signed-off-by: Leif Lindholm <leif.lindholm@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/include/asm/opcodes.h | 20 ++++++++++++
 arch/arm/kernel/Makefile       |  2 +-
 arch/arm/kernel/opcodes.c      | 72 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 93 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/include/asm/opcodes.h
 create mode 100644 arch/arm/kernel/opcodes.c

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/include/asm/opcodes.h b/arch/arm/include/asm/opcodes.h
new file mode 100644
index 000000000000..c0efdd60966f
--- /dev/null
+++ b/arch/arm/include/asm/opcodes.h
@@ -0,0 +1,20 @@
+/*
+ *  arch/arm/include/asm/opcodes.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_ARM_OPCODES_H
+#define __ASM_ARM_OPCODES_H
+
+#ifndef __ASSEMBLY__
+extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr);
+#endif
+
+#define ARM_OPCODE_CONDTEST_FAIL   0
+#define ARM_OPCODE_CONDTEST_PASS   1
+#define ARM_OPCODE_CONDTEST_UNCOND 2
+
+#endif /* __ASM_ARM_OPCODES_H */
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 16eed6aebfa4..43b740d0e374 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -13,7 +13,7 @@ CFLAGS_REMOVE_return_address.o = -pg
 
 # Object file lists.
 
-obj-y		:= elf.o entry-armv.o entry-common.o irq.o \
+obj-y		:= elf.o entry-armv.o entry-common.o irq.o opcodes.o \
 		   process.o ptrace.o return_address.o setup.o signal.o \
 		   sys_arm.o stacktrace.o time.o traps.o
 
diff --git a/arch/arm/kernel/opcodes.c b/arch/arm/kernel/opcodes.c
new file mode 100644
index 000000000000..f8179c6a817f
--- /dev/null
+++ b/arch/arm/kernel/opcodes.c
@@ -0,0 +1,72 @@
+/*
+ *  linux/arch/arm/kernel/opcodes.c
+ *
+ *  A32 condition code lookup feature moved from nwfpe/fpopcode.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <asm/opcodes.h>
+
+#define ARM_OPCODE_CONDITION_UNCOND 0xf
+
+/*
+ * condition code lookup table
+ * index into the table is test code: EQ, NE, ... LT, GT, AL, NV
+ *
+ * bit position in short is condition code: NZCV
+ */
+static const unsigned short cc_map[16] = {
+	0xF0F0,			/* EQ == Z set            */
+	0x0F0F,			/* NE                     */
+	0xCCCC,			/* CS == C set            */
+	0x3333,			/* CC                     */
+	0xFF00,			/* MI == N set            */
+	0x00FF,			/* PL                     */
+	0xAAAA,			/* VS == V set            */
+	0x5555,			/* VC                     */
+	0x0C0C,			/* HI == C set && Z clear */
+	0xF3F3,			/* LS == C clear || Z set */
+	0xAA55,			/* GE == (N==V)           */
+	0x55AA,			/* LT == (N!=V)           */
+	0x0A05,			/* GT == (!Z && (N==V))   */
+	0xF5FA,			/* LE == (Z || (N!=V))    */
+	0xFFFF,			/* AL always              */
+	0			/* NV                     */
+};
+
+/*
+ * Returns:
+ * ARM_OPCODE_CONDTEST_FAIL   - if condition fails
+ * ARM_OPCODE_CONDTEST_PASS   - if condition passes (including AL)
+ * ARM_OPCODE_CONDTEST_UNCOND - if NV condition, or separate unconditional
+ *                              opcode space from v5 onwards
+ *
+ * Code that tests whether a conditional instruction would pass its condition
+ * check should check that return value == ARM_OPCODE_CONDTEST_PASS.
+ *
+ * Code that tests if a condition means that the instruction would be executed
+ * (regardless of conditional or unconditional) should instead check that the
+ * return value != ARM_OPCODE_CONDTEST_FAIL.
+ */
+asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr)
+{
+	u32 cc_bits  = opcode >> 28;
+	u32 psr_cond = psr >> 28;
+	unsigned int ret;
+
+	if (cc_bits != ARM_OPCODE_CONDITION_UNCOND) {
+		if ((cc_map[cc_bits] >> (psr_cond)) & 1)
+			ret = ARM_OPCODE_CONDTEST_PASS;
+		else
+			ret = ARM_OPCODE_CONDTEST_FAIL;
+	} else {
+		ret = ARM_OPCODE_CONDTEST_UNCOND;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(arm_check_condition);
-- 
cgit v1.2.3


From c245dcd326fb9f8cca4b396796f0d2e54171b5c9 Mon Sep 17 00:00:00 2001
From: Leif Lindholm <leif.lindholm@arm.com>
Date: Mon, 12 Dec 2011 19:45:24 +0100
Subject: ARM: 7208/1: Add condition code checking to SWP emulation handler.

This patch fixes two separate issues with the SWP emulation handler:
1: Certain processors implementing ARMv7-A can (legally) take an
   undef exception even when the condition code would have meant that
   the instruction should not have been executed.
2: Opcodes with all flags set (condition code = 0xf) have been reused
   in recent, and not-so-recent, versions of the ARM architecture to
   implement unconditional extensions to the instruction set. The
   existing code would still have processed any undefs triggered by
   executing an opcode with such a value.

This patch uses the new generic ARM instruction set condition code
checks to implement proper handling of these situations.

Signed-off-by: Leif Lindholm <leif.lindholm@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/swp_emulate.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/swp_emulate.c b/arch/arm/kernel/swp_emulate.c
index 5f452f8fde05..df745188f5de 100644
--- a/arch/arm/kernel/swp_emulate.c
+++ b/arch/arm/kernel/swp_emulate.c
@@ -25,6 +25,7 @@
 #include <linux/syscalls.h>
 #include <linux/perf_event.h>
 
+#include <asm/opcodes.h>
 #include <asm/traps.h>
 #include <asm/uaccess.h>
 
@@ -185,6 +186,21 @@ static int swp_handler(struct pt_regs *regs, unsigned int instr)
 
 	perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, regs->ARM_pc);
 
+	res = arm_check_condition(instr, regs->ARM_cpsr);
+	switch (res) {
+	case ARM_OPCODE_CONDTEST_PASS:
+		break;
+	case ARM_OPCODE_CONDTEST_FAIL:
+		/* Condition failed - return to next instruction */
+		regs->ARM_pc += 4;
+		return 0;
+	case ARM_OPCODE_CONDTEST_UNCOND:
+		/* If unconditional encoding - not a SWP, undef */
+		return -EFAULT;
+	default:
+		return -EINVAL;
+	}
+
 	if (current->pid != previous_pid) {
 		pr_debug("\"%s\" (%ld) uses deprecated SWP{B} instruction\n",
 			 current->comm, (unsigned long)current->pid);
-- 
cgit v1.2.3


From c41584ddc1b9c7d06726057456d188d4eefec60b Mon Sep 17 00:00:00 2001
From: Leif Lindholm <leif.lindholm@arm.com>
Date: Mon, 12 Dec 2011 19:45:36 +0100
Subject: ARM: 7209/1: Use generic ARM instruction set condition code checks
 for kprobes.

This patch changes the kprobes implementation to use the generic ARM
instruction set condition code checks, rather than a dedicated
implementation.

Signed-off-by: Leif Lindholm <leif.lindholm@arm.com>
Acked-by: Jon Medhurst <tixy@yxit.co.uk>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/kprobes-test.c | 66 +++++-------------------------------------
 1 file changed, 7 insertions(+), 59 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/kprobes-test.c b/arch/arm/kernel/kprobes-test.c
index e17cdd6d90d8..1862d8f2fd44 100644
--- a/arch/arm/kernel/kprobes-test.c
+++ b/arch/arm/kernel/kprobes-test.c
@@ -202,6 +202,8 @@
 #include <linux/slab.h>
 #include <linux/kprobes.h>
 
+#include <asm/opcodes.h>
+
 #include "kprobes.h"
 #include "kprobes-test.h"
 
@@ -1050,65 +1052,9 @@ static int test_instance;
 
 static unsigned long test_check_cc(int cc, unsigned long cpsr)
 {
-	unsigned long temp;
-
-	switch (cc) {
-	case 0x0: /* eq */
-		return cpsr & PSR_Z_BIT;
-
-	case 0x1: /* ne */
-		return (~cpsr) & PSR_Z_BIT;
-
-	case 0x2: /* cs */
-		return cpsr & PSR_C_BIT;
-
-	case 0x3: /* cc */
-		return (~cpsr) & PSR_C_BIT;
-
-	case 0x4: /* mi */
-		return cpsr & PSR_N_BIT;
-
-	case 0x5: /* pl */
-		return (~cpsr) & PSR_N_BIT;
-
-	case 0x6: /* vs */
-		return cpsr & PSR_V_BIT;
-
-	case 0x7: /* vc */
-		return (~cpsr) & PSR_V_BIT;
+	int ret = arm_check_condition(cc << 28, cpsr);
 
-	case 0x8: /* hi */
-		cpsr &= ~(cpsr >> 1); /* PSR_C_BIT &= ~PSR_Z_BIT */
-		return cpsr & PSR_C_BIT;
-
-	case 0x9: /* ls */
-		cpsr &= ~(cpsr >> 1); /* PSR_C_BIT &= ~PSR_Z_BIT */
-		return (~cpsr) & PSR_C_BIT;
-
-	case 0xa: /* ge */
-		cpsr ^= (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-		return (~cpsr) & PSR_N_BIT;
-
-	case 0xb: /* lt */
-		cpsr ^= (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-		return cpsr & PSR_N_BIT;
-
-	case 0xc: /* gt */
-		temp = cpsr ^ (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-		temp |= (cpsr << 1);	   /* PSR_N_BIT |= PSR_Z_BIT */
-		return (~temp) & PSR_N_BIT;
-
-	case 0xd: /* le */
-		temp = cpsr ^ (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-		temp |= (cpsr << 1);	   /* PSR_N_BIT |= PSR_Z_BIT */
-		return temp & PSR_N_BIT;
-
-	case 0xe: /* al */
-	case 0xf: /* unconditional */
-		return true;
-	}
-	BUG();
-	return false;
+	return (ret != ARM_OPCODE_CONDTEST_FAIL);
 }
 
 static int is_last_scenario;
@@ -1128,7 +1074,9 @@ static unsigned long test_context_cpsr(int scenario)
 
 	if (!test_case_is_thumb) {
 		/* Testing ARM code */
-		probe_should_run = test_check_cc(current_instruction >> 28, cpsr) != 0;
+		int cc = current_instruction >> 28;
+
+		probe_should_run = test_check_cc(cc, cpsr) != 0;
 		if (scenario == 15)
 			is_last_scenario = true;
 
-- 
cgit v1.2.3


From 2f0778afac79bd8d226225556858a636931eeabc Mon Sep 17 00:00:00 2001
From: Marc Zyngier <Marc.Zyngier@arm.com>
Date: Thu, 15 Dec 2011 12:19:23 +0100
Subject: ARM: 7205/2: sched_clock: allow sched_clock to be selected at runtime

sched_clock() is yet another blocker on the road to the single
image. This patch implements an idea by Russell King:

http://www.spinics.net/lists/linux-omap/msg49561.html

Instead of asking the platform to implement both sched_clock()
itself and the rollover callback, simply register a read()
function, and let the ARM code care about sched_clock() itself,
the conversion to ns and the rollover. sched_clock() uses
this read() function as an indirection to the platform code.
If the platform doesn't provide a read(), the code falls back
to the jiffy counter (just like the default sched_clock).

This allow some simplifications and possibly some footprint gain
when multiple platforms are compiled in. Among the drawbacks,
the removal of the *_fixed_sched_clock optimization which could
negatively impact some platforms (sa1100, tegra, versatile
and omap).

Tested on 11MPCore, OMAP4 and Tegra.

Cc: Imre Kaloz <kaloz@openwrt.org>
Cc: Eric Miao <eric.y.miao@gmail.com>
Cc: Colin Cross <ccross@android.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Olof Johansson <olof@lixom.net>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Alessandro Rubini <rubini@unipv.it>
Cc: STEricsson <STEricsson_nomadik_linux@list.st.com>
Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Ben Dooks <ben-linux@fluff.org>
Tested-by: Jamie Iles <jamie@jamieiles.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Krzysztof Halasa <khc@pm.waw.pl>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/include/asm/sched_clock.h       | 108 +---------------------------
 arch/arm/kernel/sched_clock.c            | 118 +++++++++++++++++++++++++++----
 arch/arm/mach-ixp4xx/common.c            |  16 +----
 arch/arm/mach-mmp/time.c                 |  16 +----
 arch/arm/mach-omap1/time.c               |  58 ++-------------
 arch/arm/mach-omap2/timer.c              |  20 ++----
 arch/arm/mach-picoxcell/time.c           |  17 +----
 arch/arm/mach-pxa/time.c                 |  15 +---
 arch/arm/mach-sa1100/time.c              |  28 +-------
 arch/arm/mach-tegra/timer.c              |  24 +------
 arch/arm/mach-u300/timer.c               |  15 +---
 arch/arm/plat-iop/time.c                 |  16 +----
 arch/arm/plat-mxc/time.c                 |  15 +---
 arch/arm/plat-nomadik/timer.c            |  20 ++----
 arch/arm/plat-omap/counter_32k.c         |  40 +----------
 arch/arm/plat-omap/include/plat/common.h |   1 -
 arch/arm/plat-orion/time.c               |  21 +-----
 arch/arm/plat-s5p/s5p-time.c             |  19 +----
 arch/arm/plat-versatile/sched-clock.c    |  29 ++------
 19 files changed, 161 insertions(+), 435 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/include/asm/sched_clock.h b/arch/arm/include/asm/sched_clock.h
index c8e6ddf3e860..e3f757263438 100644
--- a/arch/arm/include/asm/sched_clock.h
+++ b/arch/arm/include/asm/sched_clock.h
@@ -8,113 +8,7 @@
 #ifndef ASM_SCHED_CLOCK
 #define ASM_SCHED_CLOCK
 
-#include <linux/kernel.h>
-#include <linux/types.h>
-
-struct clock_data {
-	u64 epoch_ns;
-	u32 epoch_cyc;
-	u32 epoch_cyc_copy;
-	u32 mult;
-	u32 shift;
-};
-
-#define DEFINE_CLOCK_DATA(name)	struct clock_data name
-
-static inline u64 cyc_to_ns(u64 cyc, u32 mult, u32 shift)
-{
-	return (cyc * mult) >> shift;
-}
-
-/*
- * Atomically update the sched_clock epoch.  Your update callback will
- * be called from a timer before the counter wraps - read the current
- * counter value, and call this function to safely move the epochs
- * forward.  Only use this from the update callback.
- */
-static inline void update_sched_clock(struct clock_data *cd, u32 cyc, u32 mask)
-{
-	unsigned long flags;
-	u64 ns = cd->epoch_ns +
-		cyc_to_ns((cyc - cd->epoch_cyc) & mask, cd->mult, cd->shift);
-
-	/*
-	 * Write epoch_cyc and epoch_ns in a way that the update is
-	 * detectable in cyc_to_fixed_sched_clock().
-	 */
-	raw_local_irq_save(flags);
-	cd->epoch_cyc = cyc;
-	smp_wmb();
-	cd->epoch_ns = ns;
-	smp_wmb();
-	cd->epoch_cyc_copy = cyc;
-	raw_local_irq_restore(flags);
-}
-
-/*
- * If your clock rate is known at compile time, using this will allow
- * you to optimize the mult/shift loads away.  This is paired with
- * init_fixed_sched_clock() to ensure that your mult/shift are correct.
- */
-static inline unsigned long long cyc_to_fixed_sched_clock(struct clock_data *cd,
-	u32 cyc, u32 mask, u32 mult, u32 shift)
-{
-	u64 epoch_ns;
-	u32 epoch_cyc;
-
-	/*
-	 * Load the epoch_cyc and epoch_ns atomically.  We do this by
-	 * ensuring that we always write epoch_cyc, epoch_ns and
-	 * epoch_cyc_copy in strict order, and read them in strict order.
-	 * If epoch_cyc and epoch_cyc_copy are not equal, then we're in
-	 * the middle of an update, and we should repeat the load.
-	 */
-	do {
-		epoch_cyc = cd->epoch_cyc;
-		smp_rmb();
-		epoch_ns = cd->epoch_ns;
-		smp_rmb();
-	} while (epoch_cyc != cd->epoch_cyc_copy);
-
-	return epoch_ns + cyc_to_ns((cyc - epoch_cyc) & mask, mult, shift);
-}
-
-/*
- * Otherwise, you need to use this, which will obtain the mult/shift
- * from the clock_data structure.  Use init_sched_clock() with this.
- */
-static inline unsigned long long cyc_to_sched_clock(struct clock_data *cd,
-	u32 cyc, u32 mask)
-{
-	return cyc_to_fixed_sched_clock(cd, cyc, mask, cd->mult, cd->shift);
-}
-
-/*
- * Initialize the clock data - calculate the appropriate multiplier
- * and shift.  Also setup a timer to ensure that the epoch is refreshed
- * at the appropriate time interval, which will call your update
- * handler.
- */
-void init_sched_clock(struct clock_data *, void (*)(void),
-	unsigned int, unsigned long);
-
-/*
- * Use this initialization function rather than init_sched_clock() if
- * you're using cyc_to_fixed_sched_clock, which will warn if your
- * constants are incorrect.
- */
-static inline void init_fixed_sched_clock(struct clock_data *cd,
-	void (*update)(void), unsigned int bits, unsigned long rate,
-	u32 mult, u32 shift)
-{
-	init_sched_clock(cd, update, bits, rate);
-	if (cd->mult != mult || cd->shift != shift) {
-		pr_crit("sched_clock: wrong multiply/shift: %u>>%u vs calculated %u>>%u\n"
-			"sched_clock: fix multiply/shift to avoid scheduler hiccups\n",
-			mult, shift, cd->mult, cd->shift);
-	}
-}
-
 extern void sched_clock_postinit(void);
+extern void setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate);
 
 #endif
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c
index 9a46370fe9da..5416c7c12528 100644
--- a/arch/arm/kernel/sched_clock.c
+++ b/arch/arm/kernel/sched_clock.c
@@ -14,61 +14,153 @@
 
 #include <asm/sched_clock.h>
 
+struct clock_data {
+	u64 epoch_ns;
+	u32 epoch_cyc;
+	u32 epoch_cyc_copy;
+	u32 mult;
+	u32 shift;
+};
+
 static void sched_clock_poll(unsigned long wrap_ticks);
 static DEFINE_TIMER(sched_clock_timer, sched_clock_poll, 0, 0);
-static void (*sched_clock_update_fn)(void);
+
+static struct clock_data cd = {
+	.mult	= NSEC_PER_SEC / HZ,
+};
+
+static u32 __read_mostly sched_clock_mask = 0xffffffff;
+
+static u32 notrace jiffy_sched_clock_read(void)
+{
+	return (u32)(jiffies - INITIAL_JIFFIES);
+}
+
+static u32 __read_mostly (*read_sched_clock)(void) = jiffy_sched_clock_read;
+
+static inline u64 cyc_to_ns(u64 cyc, u32 mult, u32 shift)
+{
+	return (cyc * mult) >> shift;
+}
+
+static unsigned long long cyc_to_sched_clock(u32 cyc, u32 mask)
+{
+	u64 epoch_ns;
+	u32 epoch_cyc;
+
+	/*
+	 * Load the epoch_cyc and epoch_ns atomically.  We do this by
+	 * ensuring that we always write epoch_cyc, epoch_ns and
+	 * epoch_cyc_copy in strict order, and read them in strict order.
+	 * If epoch_cyc and epoch_cyc_copy are not equal, then we're in
+	 * the middle of an update, and we should repeat the load.
+	 */
+	do {
+		epoch_cyc = cd.epoch_cyc;
+		smp_rmb();
+		epoch_ns = cd.epoch_ns;
+		smp_rmb();
+	} while (epoch_cyc != cd.epoch_cyc_copy);
+
+	return epoch_ns + cyc_to_ns((cyc - epoch_cyc) & mask, cd.mult, cd.shift);
+}
+
+/*
+ * Atomically update the sched_clock epoch.
+ */
+static void notrace update_sched_clock(void)
+{
+	unsigned long flags;
+	u32 cyc;
+	u64 ns;
+
+	cyc = read_sched_clock();
+	ns = cd.epoch_ns +
+		cyc_to_ns((cyc - cd.epoch_cyc) & sched_clock_mask,
+			  cd.mult, cd.shift);
+	/*
+	 * Write epoch_cyc and epoch_ns in a way that the update is
+	 * detectable in cyc_to_fixed_sched_clock().
+	 */
+	raw_local_irq_save(flags);
+	cd.epoch_cyc = cyc;
+	smp_wmb();
+	cd.epoch_ns = ns;
+	smp_wmb();
+	cd.epoch_cyc_copy = cyc;
+	raw_local_irq_restore(flags);
+}
 
 static void sched_clock_poll(unsigned long wrap_ticks)
 {
 	mod_timer(&sched_clock_timer, round_jiffies(jiffies + wrap_ticks));
-	sched_clock_update_fn();
+	update_sched_clock();
 }
 
-void __init init_sched_clock(struct clock_data *cd, void (*update)(void),
-	unsigned int clock_bits, unsigned long rate)
+void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate)
 {
 	unsigned long r, w;
 	u64 res, wrap;
 	char r_unit;
 
-	sched_clock_update_fn = update;
+	BUG_ON(bits > 32);
+	WARN_ON(!irqs_disabled());
+	WARN_ON(read_sched_clock != jiffy_sched_clock_read);
+	read_sched_clock = read;
+	sched_clock_mask = (1 << bits) - 1;
 
 	/* calculate the mult/shift to convert counter ticks to ns. */
-	clocks_calc_mult_shift(&cd->mult, &cd->shift, rate, NSEC_PER_SEC, 0);
+	clocks_calc_mult_shift(&cd.mult, &cd.shift, rate, NSEC_PER_SEC, 0);
 
 	r = rate;
 	if (r >= 4000000) {
 		r /= 1000000;
 		r_unit = 'M';
-	} else {
+	} else if (r >= 1000) {
 		r /= 1000;
 		r_unit = 'k';
-	}
+	} else
+		r_unit = ' ';
 
 	/* calculate how many ns until we wrap */
-	wrap = cyc_to_ns((1ULL << clock_bits) - 1, cd->mult, cd->shift);
+	wrap = cyc_to_ns((1ULL << bits) - 1, cd.mult, cd.shift);
 	do_div(wrap, NSEC_PER_MSEC);
 	w = wrap;
 
 	/* calculate the ns resolution of this counter */
-	res = cyc_to_ns(1ULL, cd->mult, cd->shift);
+	res = cyc_to_ns(1ULL, cd.mult, cd.shift);
 	pr_info("sched_clock: %u bits at %lu%cHz, resolution %lluns, wraps every %lums\n",
-		clock_bits, r, r_unit, res, w);
+		bits, r, r_unit, res, w);
 
 	/*
 	 * Start the timer to keep sched_clock() properly updated and
 	 * sets the initial epoch.
 	 */
 	sched_clock_timer.data = msecs_to_jiffies(w - (w / 10));
-	update();
+	update_sched_clock();
 
 	/*
 	 * Ensure that sched_clock() starts off at 0ns
 	 */
-	cd->epoch_ns = 0;
+	cd.epoch_ns = 0;
+
+	pr_debug("Registered %pF as sched_clock source\n", read);
+}
+
+unsigned long long notrace sched_clock(void)
+{
+	u32 cyc = read_sched_clock();
+	return cyc_to_sched_clock(cyc, sched_clock_mask);
 }
 
 void __init sched_clock_postinit(void)
 {
+	/*
+	 * If no sched_clock function has been provided at that point,
+	 * make it the final one one.
+	 */
+	if (read_sched_clock == jiffy_sched_clock_read)
+		setup_sched_clock(jiffy_sched_clock_read, 32, HZ);
+
 	sched_clock_poll(sched_clock_timer.data);
 }
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index b86a0055ab96..c1b12f945fc9 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -17,7 +17,6 @@
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/serial.h>
-#include <linux/sched.h>
 #include <linux/tty.h>
 #include <linux/platform_device.h>
 #include <linux/serial_core.h>
@@ -403,18 +402,9 @@ void __init ixp4xx_sys_init(void)
 /*
  * sched_clock()
  */
-static DEFINE_CLOCK_DATA(cd);
-
-unsigned long long notrace sched_clock(void)
+static u32 notrace ixp4xx_read_sched_clock(void)
 {
-	u32 cyc = *IXP4XX_OSTS;
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace ixp4xx_update_sched_clock(void)
-{
-	u32 cyc = *IXP4XX_OSTS;
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return *IXP4XX_OSTS;
 }
 
 /*
@@ -430,7 +420,7 @@ unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ;
 EXPORT_SYMBOL(ixp4xx_timer_freq);
 static void __init ixp4xx_clocksource_init(void)
 {
-	init_sched_clock(&cd, ixp4xx_update_sched_clock, 32, ixp4xx_timer_freq);
+	setup_sched_clock(ixp4xx_read_sched_clock, 32, ixp4xx_timer_freq);
 
 	clocksource_mmio_init(NULL, "OSTS", ixp4xx_timer_freq, 200, 32,
 			ixp4xx_clocksource_read);
diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c
index 4e91ee6e27c8..71fc4ee4602c 100644
--- a/arch/arm/mach-mmp/time.c
+++ b/arch/arm/mach-mmp/time.c
@@ -25,7 +25,6 @@
 
 #include <linux/io.h>
 #include <linux/irq.h>
-#include <linux/sched.h>
 
 #include <asm/sched_clock.h>
 #include <mach/addr-map.h>
@@ -42,8 +41,6 @@
 #define MAX_DELTA		(0xfffffffe)
 #define MIN_DELTA		(16)
 
-static DEFINE_CLOCK_DATA(cd);
-
 /*
  * FIXME: the timer needs some delay to stablize the counter capture
  */
@@ -59,16 +56,9 @@ static inline uint32_t timer_read(void)
 	return __raw_readl(TIMERS_VIRT_BASE + TMR_CVWR(1));
 }
 
-unsigned long long notrace sched_clock(void)
+static u32 notrace mmp_read_sched_clock(void)
 {
-	u32 cyc = timer_read();
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace mmp_update_sched_clock(void)
-{
-	u32 cyc = timer_read();
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return timer_read();
 }
 
 static irqreturn_t timer_interrupt(int irq, void *dev_id)
@@ -201,7 +191,7 @@ void __init timer_init(int irq)
 {
 	timer_config();
 
-	init_sched_clock(&cd, mmp_update_sched_clock, 32, CLOCK_TICK_RATE);
+	setup_sched_clock(mmp_read_sched_clock, 32, CLOCK_TICK_RATE);
 
 	ckevt.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC, ckevt.shift);
 	ckevt.max_delta_ns = clockevent_delta2ns(MAX_DELTA, &ckevt);
diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index 485a21d31004..b8faffa44f9e 100644
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -37,7 +37,6 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
-#include <linux/sched.h>
 #include <linux/spinlock.h>
 #include <linux/clk.h>
 #include <linux/err.h>
@@ -190,30 +189,9 @@ static __init void omap_init_mpu_timer(unsigned long rate)
  * ---------------------------------------------------------------------------
  */
 
-static DEFINE_CLOCK_DATA(cd);
-
-static inline unsigned long long notrace _omap_mpu_sched_clock(void)
-{
-	u32 cyc = ~omap_mpu_timer_read(1);
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-#ifndef CONFIG_OMAP_32K_TIMER
-unsigned long long notrace sched_clock(void)
-{
-	return _omap_mpu_sched_clock();
-}
-#else
-static unsigned long long notrace omap_mpu_sched_clock(void)
-{
-	return _omap_mpu_sched_clock();
-}
-#endif
-
-static void notrace mpu_update_sched_clock(void)
+static u32 notrace omap_mpu_read_sched_clock(void)
 {
-	u32 cyc = ~omap_mpu_timer_read(1);
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return ~omap_mpu_timer_read(1);
 }
 
 static void __init omap_init_clocksource(unsigned long rate)
@@ -223,7 +201,7 @@ static void __init omap_init_clocksource(unsigned long rate)
 			"%s: can't register clocksource!\n";
 
 	omap_mpu_timer_start(1, ~0, 1);
-	init_sched_clock(&cd, mpu_update_sched_clock, 32, rate);
+	setup_sched_clock(omap_mpu_read_sched_clock, 32, rate);
 
 	if (clocksource_mmio_init(&timer->read_tim, "mpu_timer2", rate,
 			300, 32, clocksource_mmio_readl_down))
@@ -254,30 +232,6 @@ static inline void omap_mpu_timer_init(void)
 }
 #endif	/* CONFIG_OMAP_MPU_TIMER */
 
-#if defined(CONFIG_OMAP_MPU_TIMER) && defined(CONFIG_OMAP_32K_TIMER)
-static unsigned long long (*preferred_sched_clock)(void);
-
-unsigned long long notrace sched_clock(void)
-{
-	if (!preferred_sched_clock)
-		return 0;
-
-	return preferred_sched_clock();
-}
-
-static inline void preferred_sched_clock_init(bool use_32k_sched_clock)
-{
-	if (use_32k_sched_clock)
-		preferred_sched_clock = omap_32k_sched_clock;
-	else
-		preferred_sched_clock = omap_mpu_sched_clock;
-}
-#else
-static inline void preferred_sched_clock_init(bool use_32k_sched_clcok)
-{
-}
-#endif
-
 static inline int omap_32k_timer_usable(void)
 {
 	int res = false;
@@ -299,12 +253,8 @@ static inline int omap_32k_timer_usable(void)
  */
 static void __init omap1_timer_init(void)
 {
-	if (omap_32k_timer_usable()) {
-		preferred_sched_clock_init(1);
-	} else {
+	if (!omap_32k_timer_usable())
 		omap_mpu_timer_init();
-		preferred_sched_clock_init(0);
-	}
 }
 
 struct sys_timer omap1_timer = {
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 9edcd520510f..6eeff0e0ae01 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -254,7 +254,6 @@ static struct omap_dm_timer clksrc;
 /*
  * clocksource
  */
-static DEFINE_CLOCK_DATA(cd);
 static cycle_t clocksource_read_cycles(struct clocksource *cs)
 {
 	return (cycle_t)__omap_dm_timer_read_counter(&clksrc, 1);
@@ -268,23 +267,12 @@ static struct clocksource clocksource_gpt = {
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-static void notrace dmtimer_update_sched_clock(void)
+static u32 notrace dmtimer_read_sched_clock(void)
 {
-	u32 cyc;
-
-	cyc = __omap_dm_timer_read_counter(&clksrc, 1);
-
-	update_sched_clock(&cd, cyc, (u32)~0);
-}
-
-unsigned long long notrace sched_clock(void)
-{
-	u32 cyc = 0;
-
 	if (clksrc.reserved)
-		cyc = __omap_dm_timer_read_counter(&clksrc, 1);
+		return __omap_dm_timer_read_counter(clksrc.io_base, 1);
 
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
+	return 0;
 }
 
 /* Setup free-running counter for clocksource */
@@ -301,7 +289,7 @@ static void __init omap2_gp_clocksource_init(int gptimer_id,
 
 	__omap_dm_timer_load_start(&clksrc,
 			OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1);
-	init_sched_clock(&cd, dmtimer_update_sched_clock, 32, clksrc.rate);
+	setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate);
 
 	if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))
 		pr_err("Could not register clocksource %s\n",
diff --git a/arch/arm/mach-picoxcell/time.c b/arch/arm/mach-picoxcell/time.c
index 90a554ff4499..6c89cf8ab22e 100644
--- a/arch/arm/mach-picoxcell/time.c
+++ b/arch/arm/mach-picoxcell/time.c
@@ -11,7 +11,6 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
-#include <linux/sched.h>
 
 #include <asm/mach/time.h>
 #include <asm/sched_clock.h>
@@ -66,21 +65,11 @@ static void picoxcell_add_clocksource(struct device_node *source_timer)
 	dw_apb_clocksource_register(cs);
 }
 
-static DEFINE_CLOCK_DATA(cd);
 static void __iomem *sched_io_base;
 
-unsigned long long notrace sched_clock(void)
+unsigned u32 notrace picoxcell_read_sched_clock(void)
 {
-	cycle_t cyc = sched_io_base ? __raw_readl(sched_io_base) : 0;
-
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace picoxcell_update_sched_clock(void)
-{
-	cycle_t cyc = sched_io_base ? __raw_readl(sched_io_base) : 0;
-
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return __raw_readl(sched_io_base);
 }
 
 static const struct of_device_id picoxcell_rtc_ids[] __initconst = {
@@ -100,7 +89,7 @@ static void picoxcell_init_sched_clock(void)
 	timer_get_base_and_rate(sched_timer, &sched_io_base, &rate);
 	of_node_put(sched_timer);
 
-	init_sched_clock(&cd, picoxcell_update_sched_clock, 32, rate);
+	setup_sched_clock(picoxcell_read_sched_clock, 32, rate);
 }
 
 static const struct of_device_id picoxcell_timer_ids[] __initconst = {
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c
index de684701449c..b503049d6d26 100644
--- a/arch/arm/mach-pxa/time.c
+++ b/arch/arm/mach-pxa/time.c
@@ -16,7 +16,6 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/clockchips.h>
-#include <linux/sched.h>
 
 #include <asm/div64.h>
 #include <asm/mach/irq.h>
@@ -32,18 +31,10 @@
  * long as there is always less than 582 seconds between successive
  * calls to sched_clock() which should always be the case in practice.
  */
-static DEFINE_CLOCK_DATA(cd);
 
-unsigned long long notrace sched_clock(void)
+static u32 notrace pxa_read_sched_clock(void)
 {
-	u32 cyc = OSCR;
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace pxa_update_sched_clock(void)
-{
-	u32 cyc = OSCR;
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return OSCR;
 }
 
 
@@ -119,7 +110,7 @@ static void __init pxa_timer_init(void)
 	OIER = 0;
 	OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3;
 
-	init_sched_clock(&cd, pxa_update_sched_clock, 32, clock_tick_rate);
+	setup_sched_clock(pxa_read_sched_clock, 32, clock_tick_rate);
 
 	clockevents_calc_mult_shift(&ckevt_pxa_osmr0, clock_tick_rate, 4);
 	ckevt_pxa_osmr0.max_delta_ns =
diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c
index fa6602491d54..1ee6d4ca8dd7 100644
--- a/arch/arm/mach-sa1100/time.c
+++ b/arch/arm/mach-sa1100/time.c
@@ -12,7 +12,6 @@
 #include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/sched.h>	/* just for sched_clock() - funny that */
 #include <linux/timex.h>
 #include <linux/clockchips.h>
 
@@ -20,29 +19,9 @@
 #include <asm/sched_clock.h>
 #include <mach/hardware.h>
 
-/*
- * This is the SA11x0 sched_clock implementation.
- */
-static DEFINE_CLOCK_DATA(cd);
-
-/*
- * Constants generated by clocks_calc_mult_shift(m, s, 3.6864MHz,
- * NSEC_PER_SEC, 60).
- * This gives a resolution of about 271ns and a wrap period of about 19min.
- */
-#define SC_MULT		2275555556u
-#define SC_SHIFT	23
-
-unsigned long long notrace sched_clock(void)
-{
-	u32 cyc = OSCR;
-	return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
-}
-
-static void notrace sa1100_update_sched_clock(void)
+static u32 notrace sa100_read_sched_clock(void)
 {
-	u32 cyc = OSCR;
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return OSCR;
 }
 
 #define MIN_OSCR_DELTA 2
@@ -109,8 +88,7 @@ static void __init sa1100_timer_init(void)
 	OIER = 0;
 	OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3;
 
-	init_fixed_sched_clock(&cd, sa1100_update_sched_clock, 32,
-			       3686400, SC_MULT, SC_SHIFT);
+	setup_sched_clock(sa1100_read_sched_clock, 32, 3686400);
 
 	clockevents_calc_mult_shift(&ckevt_sa1100_osmr0, 3686400, 4);
 	ckevt_sa1100_osmr0.max_delta_ns =
diff --git a/arch/arm/mach-tegra/timer.c b/arch/arm/mach-tegra/timer.c
index e2272d263a83..732c724008b1 100644
--- a/arch/arm/mach-tegra/timer.c
+++ b/arch/arm/mach-tegra/timer.c
@@ -19,7 +19,6 @@
 
 #include <linux/init.h>
 #include <linux/err.h>
-#include <linux/sched.h>
 #include <linux/time.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
@@ -106,25 +105,9 @@ static struct clock_event_device tegra_clockevent = {
 	.set_mode	= tegra_timer_set_mode,
 };
 
-static DEFINE_CLOCK_DATA(cd);
-
-/*
- * Constants generated by clocks_calc_mult_shift(m, s, 1MHz, NSEC_PER_SEC, 60).
- * This gives a resolution of about 1us and a wrap period of about 1h11min.
- */
-#define SC_MULT		4194304000u
-#define SC_SHIFT	22
-
-unsigned long long notrace sched_clock(void)
-{
-	u32 cyc = timer_readl(TIMERUS_CNTR_1US);
-	return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
-}
-
-static void notrace tegra_update_sched_clock(void)
+static u32 notrace tegra_read_sched_clock(void)
 {
-	u32 cyc = timer_readl(TIMERUS_CNTR_1US);
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return timer_readl(TIMERUS_CNTR_1US);
 }
 
 /*
@@ -218,8 +201,7 @@ static void __init tegra_init_timer(void)
 		WARN(1, "Unknown clock rate");
 	}
 
-	init_fixed_sched_clock(&cd, tegra_update_sched_clock, 32,
-			       1000000, SC_MULT, SC_SHIFT);
+	setup_sched_clock(tegra_read_sched_clock, 32, 1000000);
 
 	if (clocksource_mmio_init(timer_reg_base + TIMERUS_CNTR_1US,
 		"timer_us", 1000000, 300, 32, clocksource_mmio_readl_up)) {
diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c
index 5f51bdeef0ef..bc1c7897e82d 100644
--- a/arch/arm/mach-u300/timer.c
+++ b/arch/arm/mach-u300/timer.c
@@ -9,7 +9,6 @@
  * Author: Linus Walleij <linus.walleij@stericsson.com>
  */
 #include <linux/interrupt.h>
-#include <linux/sched.h>
 #include <linux/time.h>
 #include <linux/timex.h>
 #include <linux/clockchips.h>
@@ -337,18 +336,10 @@ static struct irqaction u300_timer_irq = {
  * this wraps around for now, since it is just a relative time
  * stamp. (Inspired by OMAP implementation.)
  */
-static DEFINE_CLOCK_DATA(cd);
 
-unsigned long long notrace sched_clock(void)
+static u32 notrace u300_read_sched_clock(void)
 {
-	u32 cyc = readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace u300_update_sched_clock(void)
-{
-	u32 cyc = readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
 }
 
 
@@ -366,7 +357,7 @@ static void __init u300_timer_init(void)
 	clk_enable(clk);
 	rate = clk_get_rate(clk);
 
-	init_sched_clock(&cd, u300_update_sched_clock, 32, rate);
+	setup_sched_clock(u300_read_sched_clock, 32, rate);
 
 	/*
 	 * Disable the "OS" and "DD" timers - these are designed for Symbian!
diff --git a/arch/arm/plat-iop/time.c b/arch/arm/plat-iop/time.c
index 568dd0223d17..cbfbbe461788 100644
--- a/arch/arm/plat-iop/time.c
+++ b/arch/arm/plat-iop/time.c
@@ -18,7 +18,6 @@
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/timex.h>
-#include <linux/sched.h>
 #include <linux/io.h>
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
@@ -52,21 +51,12 @@ static struct clocksource iop_clocksource = {
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-static DEFINE_CLOCK_DATA(cd);
-
 /*
  * IOP sched_clock() implementation via its clocksource.
  */
-unsigned long long notrace sched_clock(void)
+static u32 notrace iop_read_sched_clock(void)
 {
-	u32 cyc = 0xffffffffu - read_tcr1();
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace iop_update_sched_clock(void)
-{
-	u32 cyc = 0xffffffffu - read_tcr1();
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return 0xffffffffu - read_tcr1();
 }
 
 /*
@@ -152,7 +142,7 @@ void __init iop_init_time(unsigned long tick_rate)
 {
 	u32 timer_ctl;
 
-	init_sched_clock(&cd, iop_update_sched_clock, 32, tick_rate);
+	setup_sched_clock(iop_read_sched_clock, 32, tick_rate);
 
 	ticks_per_jiffy = DIV_ROUND_CLOSEST(tick_rate, HZ);
 	iop_tick_rate = tick_rate;
diff --git a/arch/arm/plat-mxc/time.c b/arch/arm/plat-mxc/time.c
index 4b0fe285e83c..1c96cdb4c35e 100644
--- a/arch/arm/plat-mxc/time.c
+++ b/arch/arm/plat-mxc/time.c
@@ -108,18 +108,9 @@ static void gpt_irq_acknowledge(void)
 
 static void __iomem *sched_clock_reg;
 
-static DEFINE_CLOCK_DATA(cd);
-unsigned long long notrace sched_clock(void)
+static u32 notrace mxc_read_sched_clock(void)
 {
-	cycle_t cyc = sched_clock_reg ? __raw_readl(sched_clock_reg) : 0;
-
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace mxc_update_sched_clock(void)
-{
-	cycle_t cyc = sched_clock_reg ? __raw_readl(sched_clock_reg) : 0;
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return sched_clock_reg ? __raw_readl(sched_clock_reg) : 0;
 }
 
 static int __init mxc_clocksource_init(struct clk *timer_clk)
@@ -129,7 +120,7 @@ static int __init mxc_clocksource_init(struct clk *timer_clk)
 
 	sched_clock_reg = reg;
 
-	init_sched_clock(&cd, mxc_update_sched_clock, 32, c);
+	setup_sched_clock(mxc_read_sched_clock, 32, c);
 	return clocksource_mmio_init(reg, "mxc_timer1", c, 200, 32,
 			clocksource_mmio_readl_up);
 }
diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c
index 30b6433d910d..ad1b45b605a4 100644
--- a/arch/arm/plat-nomadik/timer.c
+++ b/arch/arm/plat-nomadik/timer.c
@@ -17,7 +17,6 @@
 #include <linux/clk.h>
 #include <linux/jiffies.h>
 #include <linux/err.h>
-#include <linux/sched.h>
 #include <asm/mach/time.h>
 #include <asm/sched_clock.h>
 
@@ -79,23 +78,12 @@ void __iomem *mtu_base; /* Assigned by machine code */
  * local implementation which uses the clocksource to get some
  * better resolution when scheduling the kernel.
  */
-static DEFINE_CLOCK_DATA(cd);
-
-unsigned long long notrace sched_clock(void)
+static u32 notrace nomadik_read_sched_clock(void)
 {
-	u32 cyc;
-
 	if (unlikely(!mtu_base))
 		return 0;
 
-	cyc = -readl(mtu_base + MTU_VAL(0));
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void notrace nomadik_update_sched_clock(void)
-{
-	u32 cyc = -readl(mtu_base + MTU_VAL(0));
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return -readl(mtu_base + MTU_VAL(0));
 }
 #endif
 
@@ -231,9 +219,11 @@ void __init nmdk_timer_init(void)
 			rate, 200, 32, clocksource_mmio_readl_down))
 		pr_err("timer: failed to initialize clock source %s\n",
 		       "mtu_0");
+
 #ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK
-	init_sched_clock(&cd, nomadik_update_sched_clock, 32, rate);
+	setup_sched_clock(nomadik_read_sched_clock, 32, rate);
 #endif
+
 	/* Timer 1 is used for events */
 
 	clockevents_calc_mult_shift(&nmdk_clkevt, rate, MTU_MIN_RANGE);
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index a6cbb712da51..5f0f2292b7fb 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -17,7 +17,6 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
-#include <linux/sched.h>
 #include <linux/clocksource.h>
 
 #include <asm/sched_clock.h>
@@ -37,41 +36,9 @@ static void __iomem *timer_32k_base;
 
 #define OMAP16XX_TIMER_32K_SYNCHRONIZED		0xfffbc410
 
-/*
- * Returns current time from boot in nsecs. It's OK for this to wrap
- * around for now, as it's just a relative time stamp.
- */
-static DEFINE_CLOCK_DATA(cd);
-
-/*
- * Constants generated by clocks_calc_mult_shift(m, s, 32768, NSEC_PER_SEC, 60).
- * This gives a resolution of about 30us and a wrap period of about 36hrs.
- */
-#define SC_MULT		4000000000u
-#define SC_SHIFT	17
-
-static inline unsigned long long notrace _omap_32k_sched_clock(void)
-{
-	u32 cyc = timer_32k_base ? __raw_readl(timer_32k_base) : 0;
-	return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
-}
-
-#if defined(CONFIG_OMAP_32K_TIMER) && !defined(CONFIG_OMAP_MPU_TIMER)
-unsigned long long notrace sched_clock(void)
-{
-	return _omap_32k_sched_clock();
-}
-#else
-unsigned long long notrace omap_32k_sched_clock(void)
-{
-	return _omap_32k_sched_clock();
-}
-#endif
-
-static void notrace omap_update_sched_clock(void)
+static u32 notrace omap_32k_read_sched_clock(void)
 {
-	u32 cyc = timer_32k_base ? __raw_readl(timer_32k_base) : 0;
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return timer_32k_base ? __raw_readl(timer_32k_base) : 0;
 }
 
 /**
@@ -147,8 +114,7 @@ int __init omap_init_clocksource_32k(void)
 					  clocksource_mmio_readl_up))
 			printk(err, "32k_counter");
 
-		init_fixed_sched_clock(&cd, omap_update_sched_clock, 32,
-				       32768, SC_MULT, SC_SHIFT);
+		setup_sched_clock(omap_32k_read_sched_clock, 32, 32768);
 	}
 	return 0;
 }
diff --git a/arch/arm/plat-omap/include/plat/common.h b/arch/arm/plat-omap/include/plat/common.h
index 257f9770b2da..b4d7ec3fbfbe 100644
--- a/arch/arm/plat-omap/include/plat/common.h
+++ b/arch/arm/plat-omap/include/plat/common.h
@@ -31,7 +31,6 @@
 #include <plat/omap_hwmod.h>
 
 extern int __init omap_init_clocksource_32k(void);
-extern unsigned long long notrace omap_32k_sched_clock(void);
 
 extern void omap_reserve(void);
 extern int omap_dss_reset(struct omap_hwmod *);
diff --git a/arch/arm/plat-orion/time.c b/arch/arm/plat-orion/time.c
index 69a61367e4b8..1ed8d1397fcf 100644
--- a/arch/arm/plat-orion/time.c
+++ b/arch/arm/plat-orion/time.c
@@ -12,7 +12,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/sched.h>
 #include <linux/timer.h>
 #include <linux/clockchips.h>
 #include <linux/interrupt.h>
@@ -60,24 +59,10 @@ static u32 ticks_per_jiffy;
  * Orion's sched_clock implementation. It has a resolution of
  * at least 7.5ns (133MHz TCLK).
  */
-static DEFINE_CLOCK_DATA(cd);
 
-unsigned long long notrace sched_clock(void)
+static u32 notrace orion_read_sched_clock(void)
 {
-	u32 cyc = ~readl(timer_base + TIMER0_VAL_OFF);
-	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
-}
-
-
-static void notrace orion_update_sched_clock(void)
-{
-	u32 cyc = ~readl(timer_base + TIMER0_VAL_OFF);
-	update_sched_clock(&cd, cyc, (u32)~0);
-}
-
-static void __init setup_sched_clock(unsigned long tclk)
-{
-	init_sched_clock(&cd, orion_update_sched_clock, 32, tclk);
+	return ~readl(timer_base + TIMER0_VAL_OFF);
 }
 
 /*
@@ -217,7 +202,7 @@ orion_time_init(u32 _bridge_base, u32 _bridge_timer1_clr_mask,
 	/*
 	 * Set scale and timer for sched_clock.
 	 */
-	setup_sched_clock(tclk);
+	setup_sched_clock(orion_read_sched_clock, 32, tclk);
 
 	/*
 	 * Setup free-running clocksource timer (interrupts
diff --git a/arch/arm/plat-s5p/s5p-time.c b/arch/arm/plat-s5p/s5p-time.c
index c833e7b57599..17c0a2c58dfd 100644
--- a/arch/arm/plat-s5p/s5p-time.c
+++ b/arch/arm/plat-s5p/s5p-time.c
@@ -10,7 +10,6 @@
  * published by the Free Software Foundation.
 */
 
-#include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/err.h>
@@ -321,26 +320,14 @@ static void __iomem *s5p_timer_reg(void)
  * this wraps around for now, since it is just a relative time
  * stamp. (Inspired by U300 implementation.)
  */
-static DEFINE_CLOCK_DATA(cd);
-
-unsigned long long notrace sched_clock(void)
+static u32 notrace s5p_read_sched_clock(void)
 {
 	void __iomem *reg = s5p_timer_reg();
 
 	if (!reg)
 		return 0;
 
-	return cyc_to_sched_clock(&cd, ~__raw_readl(reg), (u32)~0);
-}
-
-static void notrace s5p_update_sched_clock(void)
-{
-	void __iomem *reg = s5p_timer_reg();
-
-	if (!reg)
-		return;
-
-	update_sched_clock(&cd, ~__raw_readl(reg), (u32)~0);
+	return ~__raw_readl(reg);
 }
 
 static void __init s5p_clocksource_init(void)
@@ -358,7 +345,7 @@ static void __init s5p_clocksource_init(void)
 	s5p_time_setup(timer_source.source_id, TCNT_MAX);
 	s5p_time_start(timer_source.source_id, PERIODIC);
 
-	init_sched_clock(&cd, s5p_update_sched_clock, 32, clock_rate);
+	setup_sched_clock(s5p_read_sched_clock, 32, clock_rate);
 
 	if (clocksource_mmio_init(s5p_timer_reg(), "s5p_clocksource_timer",
 			clock_rate, 250, 32, clocksource_mmio_readl_down))
diff --git a/arch/arm/plat-versatile/sched-clock.c b/arch/arm/plat-versatile/sched-clock.c
index 3d6a4c292cab..b33b74c87232 100644
--- a/arch/arm/plat-versatile/sched-clock.c
+++ b/arch/arm/plat-versatile/sched-clock.c
@@ -18,41 +18,24 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
+#include <linux/kernel.h>
 #include <linux/io.h>
-#include <linux/sched.h>
 
 #include <asm/sched_clock.h>
 #include <plat/sched_clock.h>
 
-static DEFINE_CLOCK_DATA(cd);
 static void __iomem *ctr;
 
-/*
- * Constants generated by clocks_calc_mult_shift(m, s, 24MHz, NSEC_PER_SEC, 60).
- * This gives a resolution of about 41ns and a wrap period of about 178s.
- */
-#define SC_MULT		2796202667u
-#define SC_SHIFT	26
-
-unsigned long long notrace sched_clock(void)
+static u32 notrace versatile_read_sched_clock(void)
 {
-	if (ctr) {
-		u32 cyc = readl(ctr);
-		return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0,
-						SC_MULT, SC_SHIFT);
-	} else
-		return 0;
-}
+	if (ctr)
+		return readl(ctr);
 
-static void notrace versatile_update_sched_clock(void)
-{
-	u32 cyc = readl(ctr);
-	update_sched_clock(&cd, cyc, (u32)~0);
+	return 0;
 }
 
 void __init versatile_sched_clock_init(void __iomem *reg, unsigned long rate)
 {
 	ctr = reg;
-	init_fixed_sched_clock(&cd, versatile_update_sched_clock,
-			       32, rate, SC_MULT, SC_SHIFT);
+	setup_sched_clock(versatile_read_sched_clock, 32, rate);
 }
-- 
cgit v1.2.3


From 54d15b1d7ac550ecd8ab6b04309c2def614f8c80 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 13 Dec 2011 12:46:43 +0100
Subject: ARM: 7210/1: smp_twd: modernize clock event registration

This break-out from Colin Cross' cpufreq-aware TWD patch will
just modernize the clock event registration code to use
clockevents_config_and_register().

[Broke out of larger SMP TWD patch]

Signed-off-by: Colin Cross <ccross@android.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/smp_twd.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index a8a6682d6b52..f0575610b17e 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -173,15 +173,11 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
 	clk->rating = 350;
 	clk->set_mode = twd_set_mode;
 	clk->set_next_event = twd_set_next_event;
-	clk->shift = 20;
-	clk->mult = div_sc(twd_timer_rate, NSEC_PER_SEC, clk->shift);
-	clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk);
-	clk->min_delta_ns = clockevent_delta2ns(0xf, clk);
 
 	this_cpu_clk = __this_cpu_ptr(twd_evt);
 	*this_cpu_clk = clk;
 
-	clockevents_register_device(clk);
-
+	clockevents_config_and_register(clk, twd_timer_rate,
+					0xf, 0xffffffff);
 	enable_percpu_irq(clk->irq, 0);
 }
-- 
cgit v1.2.3


From 5def51b0f827931bb559e6195060d774894fc9f9 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 13 Dec 2011 12:47:31 +0100
Subject: ARM: 7211/1: smp_twd: get the rate from a clock

This break-out from Colin Cross' cpufreq-aware TWD patch will
optionally retrieve the clock rate of the TWD from an external
clock. A variant of this patch has been proposed by Rob Herring
as well.

The basic idea is to avoid recalibrating the rate of the clock
at boot if the platform already know what rate the clock to the
TWD block has.

ChangeLog v1->v2: added clk_[prepare|unprepare] calls.

[Broke out of larger SMP TWD patch]

Signed-off-by: Colin Cross <ccross@android.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/smp_twd.c | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index f0575610b17e..a9783947c086 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -10,8 +10,10 @@
  */
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/err.h>
 #include <linux/smp.h>
 #include <linux/jiffies.h>
 #include <linux/clockchips.h>
@@ -25,6 +27,7 @@
 /* set up by the platform code */
 void __iomem *twd_base;
 
+static struct clk *twd_clk;
 static unsigned long twd_timer_rate;
 
 static struct clock_event_device __percpu **twd_evt;
@@ -140,6 +143,35 @@ static irqreturn_t twd_handler(int irq, void *dev_id)
 	return IRQ_NONE;
 }
 
+static struct clk *twd_get_clock(void)
+{
+	struct clk *clk;
+	int err;
+
+	clk = clk_get_sys("smp_twd", NULL);
+	if (IS_ERR(clk)) {
+		pr_err("smp_twd: clock not found: %d\n", (int)PTR_ERR(clk));
+		return clk;
+	}
+
+	err = clk_prepare(clk);
+	if (err) {
+		pr_err("smp_twd: clock failed to prepare: %d\n", err);
+		clk_put(clk);
+		return ERR_PTR(err);
+	}
+
+	err = clk_enable(clk);
+	if (err) {
+		pr_err("smp_twd: clock failed to enable: %d\n", err);
+		clk_unprepare(clk);
+		clk_put(clk);
+		return ERR_PTR(err);
+	}
+
+	return clk;
+}
+
 /*
  * Setup the local clock events for a CPU.
  */
@@ -165,7 +197,13 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
 		}
 	}
 
-	twd_calibrate_rate();
+	if (!twd_clk)
+		twd_clk = twd_get_clock();
+
+	if (!IS_ERR_OR_NULL(twd_clk))
+		twd_timer_rate = clk_get_rate(twd_clk);
+	else
+		twd_calibrate_rate();
 
 	clk->name = "local_timer";
 	clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
-- 
cgit v1.2.3


From 4fd7f9b128107034fa925b6877fae3c275f0da86 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 13 Dec 2011 12:48:18 +0100
Subject: ARM: 7212/1: smp_twd: reconfigure clockevents after cpufreq change

This break-out from Colin Cross' cpufreq-aware TWD patch
will handle the case when our localtimer's clock changes with
the cpu clock. A cpufreq transtion notifier will be registered
only if the platform has supplied a specified clock to the TWD.

After a cpufreq transition, update the clockevent's frequency
by fetching the new clock rate from the clock framework and
reprogram the next clock event.

The necessary changes in the clockevents framework was done by
Thomas Gleixner in kernel v3.0.

ChangeLog v1->v2:
- Replace IS_ERR_OR_NULL() with IS_ERR() in twd_clk check.
- Update code to use the already existing per-cpu array of TWD
  clockevents instead of adding cruft.

[Broke out, ifdef:ed CPUfreq stuff for non-cpufreq configs]
[Rebased to newer TWD base with per-CPU clock array]

Signed-off-by: Colin Cross <ccross@android.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/smp_twd.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index a9783947c086..c8e938553d47 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -11,6 +11,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/clk.h>
+#include <linux/cpufreq.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
@@ -92,6 +93,52 @@ void twd_timer_stop(struct clock_event_device *clk)
 	disable_percpu_irq(clk->irq);
 }
 
+#ifdef CONFIG_CPU_FREQ
+
+/*
+ * Updates clockevent frequency when the cpu frequency changes.
+ * Called on the cpu that is changing frequency with interrupts disabled.
+ */
+static void twd_update_frequency(void *data)
+{
+	twd_timer_rate = clk_get_rate(twd_clk);
+
+	clockevents_update_freq(*__this_cpu_ptr(twd_evt), twd_timer_rate);
+}
+
+static int twd_cpufreq_transition(struct notifier_block *nb,
+	unsigned long state, void *data)
+{
+	struct cpufreq_freqs *freqs = data;
+
+	/*
+	 * The twd clock events must be reprogrammed to account for the new
+	 * frequency.  The timer is local to a cpu, so cross-call to the
+	 * changing cpu.
+	 */
+	if (state == CPUFREQ_POSTCHANGE || state == CPUFREQ_RESUMECHANGE)
+		smp_call_function_single(freqs->cpu, twd_update_frequency,
+			NULL, 1);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block twd_cpufreq_nb = {
+	.notifier_call = twd_cpufreq_transition,
+};
+
+static int twd_cpufreq_init(void)
+{
+	if (!IS_ERR(twd_clk))
+		return cpufreq_register_notifier(&twd_cpufreq_nb,
+			CPUFREQ_TRANSITION_NOTIFIER);
+
+	return 0;
+}
+core_initcall(twd_cpufreq_init);
+
+#endif
+
 static void __cpuinit twd_calibrate_rate(void)
 {
 	unsigned long count;
-- 
cgit v1.2.3


From f88b8979d26615ce68772cebc85c3b556571afca Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Sat, 5 Nov 2011 21:30:00 +0000
Subject: ARM: restart: remove the now empty arch_reset()

Remove the now empty arch_reset() from all the mach/system.h includes,
and remove its callsite.  Remove arm_machine_restart() as this function
no longer does anything useful.

For samsung platforms, remove the include of mach/system-reset.h and
plat/system-reset.h from their respective mach/system.h headers as these
just define their arch_reset functions.  As a result, the s3c2410 and
plat-samsung system-reset.h files are no longer referenced, so remove
these files entirely.

Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/include/asm/system.h                     |  1 -
 arch/arm/kernel/process.c                         | 10 ++--------
 arch/arm/mach-at91/include/mach/system.h          |  4 ----
 arch/arm/mach-bcmring/include/mach/system.h       |  4 ----
 arch/arm/mach-clps711x/include/mach/system.h      |  4 ----
 arch/arm/mach-cns3xxx/include/mach/system.h       |  4 ----
 arch/arm/mach-davinci/include/mach/system.h       |  4 ----
 arch/arm/mach-dove/include/mach/system.h          |  5 -----
 arch/arm/mach-ebsa110/include/mach/system.h       |  4 ----
 arch/arm/mach-ep93xx/include/mach/system.h        |  4 ----
 arch/arm/mach-exynos/include/mach/system.h        |  2 --
 arch/arm/mach-footbridge/include/mach/system.h    |  4 ----
 arch/arm/mach-h720x/include/mach/system.h         |  4 ----
 arch/arm/mach-highbank/include/mach/system.h      |  4 ----
 arch/arm/mach-integrator/include/mach/system.h    |  4 ----
 arch/arm/mach-iop13xx/include/mach/system.h       |  4 ----
 arch/arm/mach-iop32x/include/mach/system.h        |  4 ----
 arch/arm/mach-iop33x/include/mach/system.h        |  4 ----
 arch/arm/mach-ixp2000/include/mach/system.h       |  4 ----
 arch/arm/mach-ixp23xx/include/mach/system.h       |  4 ----
 arch/arm/mach-ixp4xx/include/mach/system.h        |  4 ----
 arch/arm/mach-kirkwood/include/mach/system.h      |  4 ----
 arch/arm/mach-ks8695/include/mach/system.h        |  4 ----
 arch/arm/mach-lpc32xx/include/mach/system.h       |  4 ----
 arch/arm/mach-mmp/include/mach/system.h           |  4 ----
 arch/arm/mach-msm/include/mach/system.h           |  4 ----
 arch/arm/mach-mv78xx0/include/mach/system.h       |  5 -----
 arch/arm/mach-mxs/include/mach/system.h           |  4 ----
 arch/arm/mach-netx/include/mach/system.h          |  4 ----
 arch/arm/mach-nomadik/include/mach/system.h       |  4 ----
 arch/arm/mach-orion5x/include/mach/system.h       |  4 ----
 arch/arm/mach-picoxcell/include/mach/system.h     |  4 ----
 arch/arm/mach-pnx4008/include/mach/system.h       |  4 ----
 arch/arm/mach-prima2/include/mach/system.h        |  4 ----
 arch/arm/mach-pxa/include/mach/system.h           |  4 ----
 arch/arm/mach-realview/include/mach/system.h      |  4 ----
 arch/arm/mach-rpc/include/mach/system.h           |  4 ----
 arch/arm/mach-s3c2410/include/mach/system-reset.h | 15 ---------------
 arch/arm/mach-s3c2410/include/mach/system.h       |  2 --
 arch/arm/mach-s3c64xx/include/mach/system.h       |  4 ----
 arch/arm/mach-s5p64x0/include/mach/system.h       |  2 --
 arch/arm/mach-s5pc100/include/mach/system.h       |  2 --
 arch/arm/mach-s5pv210/include/mach/system.h       |  2 --
 arch/arm/mach-sa1100/include/mach/system.h        |  4 ----
 arch/arm/mach-shark/include/mach/system.h         |  4 ----
 arch/arm/mach-tegra/include/mach/system.h         |  4 ----
 arch/arm/mach-u300/include/mach/system.h          |  4 ----
 arch/arm/mach-ux500/include/mach/system.h         |  4 ----
 arch/arm/mach-versatile/include/mach/system.h     |  4 ----
 arch/arm/mach-vexpress/include/mach/system.h      |  4 ----
 arch/arm/mach-w90x900/include/mach/system.h       |  5 -----
 arch/arm/mach-zynq/include/mach/system.h          |  4 ----
 arch/arm/plat-mxc/include/mach/system.h           |  4 ----
 arch/arm/plat-omap/include/plat/system.h          |  4 ----
 arch/arm/plat-samsung/include/plat/system-reset.h | 20 --------------------
 arch/arm/plat-spear/include/plat/system.h         |  4 ----
 56 files changed, 2 insertions(+), 245 deletions(-)
 delete mode 100644 arch/arm/mach-s3c2410/include/mach/system-reset.h
 delete mode 100644 arch/arm/plat-samsung/include/plat/system-reset.h

(limited to 'arch/arm/kernel')

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index fe7de7571bac..03775b14be87 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -100,7 +100,6 @@ extern void __show_regs(struct pt_regs *);
 extern int __pure cpu_architecture(void);
 extern void cpu_init(void);
 
-void arm_machine_restart(char mode, const char *cmd);
 void soft_restart(unsigned long);
 extern void (*arm_pm_restart)(char str, const char *cmd);
 
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index eeb3e16c6046..17859ce4e7be 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -117,14 +117,8 @@ void soft_restart(unsigned long addr)
 	cpu_reset(addr);
 }
 
-void arm_machine_restart(char mode, const char *cmd)
+static void null_restart(char mode, const char *cmd)
 {
-	/* Disable interrupts first */
-	local_irq_disable();
-	local_fiq_disable();
-
-	/* Call the architecture specific reboot code. */
-	arch_reset(mode, cmd);
 }
 
 /*
@@ -133,7 +127,7 @@ void arm_machine_restart(char mode, const char *cmd)
 void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
-void (*arm_pm_restart)(char str, const char *cmd) = arm_machine_restart;
+void (*arm_pm_restart)(char str, const char *cmd) = null_restart;
 EXPORT_SYMBOL_GPL(arm_pm_restart);
 
 static void do_nothing(void *unused)
diff --git a/arch/arm/mach-at91/include/mach/system.h b/arch/arm/mach-at91/include/mach/system.h
index 079eb12b073f..cbd64f3bcecd 100644
--- a/arch/arm/mach-at91/include/mach/system.h
+++ b/arch/arm/mach-at91/include/mach/system.h
@@ -47,8 +47,4 @@ static inline void arch_idle(void)
 #endif
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-bcmring/include/mach/system.h b/arch/arm/mach-bcmring/include/mach/system.h
index ca0fbf563d86..cb78250db649 100644
--- a/arch/arm/mach-bcmring/include/mach/system.h
+++ b/arch/arm/mach-bcmring/include/mach/system.h
@@ -25,8 +25,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-clps711x/include/mach/system.h b/arch/arm/mach-clps711x/include/mach/system.h
index 9982debfac36..23d6ef8c84da 100644
--- a/arch/arm/mach-clps711x/include/mach/system.h
+++ b/arch/arm/mach-clps711x/include/mach/system.h
@@ -32,8 +32,4 @@ static inline void arch_idle(void)
 	mov	r0, r0");
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-cns3xxx/include/mach/system.h b/arch/arm/mach-cns3xxx/include/mach/system.h
index f92540d8211e..9e56b7dc133a 100644
--- a/arch/arm/mach-cns3xxx/include/mach/system.h
+++ b/arch/arm/mach-cns3xxx/include/mach/system.h
@@ -22,8 +22,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-davinci/include/mach/system.h b/arch/arm/mach-davinci/include/mach/system.h
index 6bd1dc06db27..fcb7a015aba5 100644
--- a/arch/arm/mach-davinci/include/mach/system.h
+++ b/arch/arm/mach-davinci/include/mach/system.h
@@ -18,8 +18,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif /* __ASM_ARCH_SYSTEM_H */
diff --git a/arch/arm/mach-dove/include/mach/system.h b/arch/arm/mach-dove/include/mach/system.h
index 25a3a652f4bb..3027954f6162 100644
--- a/arch/arm/mach-dove/include/mach/system.h
+++ b/arch/arm/mach-dove/include/mach/system.h
@@ -14,9 +14,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
-
 #endif
diff --git a/arch/arm/mach-ebsa110/include/mach/system.h b/arch/arm/mach-ebsa110/include/mach/system.h
index 574e63385d0e..2e4af65edb6f 100644
--- a/arch/arm/mach-ebsa110/include/mach/system.h
+++ b/arch/arm/mach-ebsa110/include/mach/system.h
@@ -34,8 +34,4 @@ static inline void arch_idle(void)
 	asm volatile ("mcr p15, 0, ip, c15, c1, 2" : : : "cc");
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-ep93xx/include/mach/system.h b/arch/arm/mach-ep93xx/include/mach/system.h
index b27a6546eb41..b5bec7cb9b52 100644
--- a/arch/arm/mach-ep93xx/include/mach/system.h
+++ b/arch/arm/mach-ep93xx/include/mach/system.h
@@ -5,7 +5,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-exynos/include/mach/system.h b/arch/arm/mach-exynos/include/mach/system.h
index 5e3220c18fc7..0063a6de3dc8 100644
--- a/arch/arm/mach-exynos/include/mach/system.h
+++ b/arch/arm/mach-exynos/include/mach/system.h
@@ -13,8 +13,6 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-#include <plat/system-reset.h>
-
 static void arch_idle(void)
 {
 	/* nothing here yet */
diff --git a/arch/arm/mach-footbridge/include/mach/system.h b/arch/arm/mach-footbridge/include/mach/system.h
index 794a02c867fe..a174a5841bc2 100644
--- a/arch/arm/mach-footbridge/include/mach/system.h
+++ b/arch/arm/mach-footbridge/include/mach/system.h
@@ -11,7 +11,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-h720x/include/mach/system.h b/arch/arm/mach-h720x/include/mach/system.h
index b04f08dcc49a..16ac46e239aa 100644
--- a/arch/arm/mach-h720x/include/mach/system.h
+++ b/arch/arm/mach-h720x/include/mach/system.h
@@ -24,8 +24,4 @@ static void arch_idle(void)
 	nop();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-highbank/include/mach/system.h b/arch/arm/mach-highbank/include/mach/system.h
index 0754c79114b0..b1d8b5fbe373 100644
--- a/arch/arm/mach-highbank/include/mach/system.h
+++ b/arch/arm/mach-highbank/include/mach/system.h
@@ -21,8 +21,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-integrator/include/mach/system.h b/arch/arm/mach-integrator/include/mach/system.h
index 12fc8c3157c3..901514eba4a6 100644
--- a/arch/arm/mach-integrator/include/mach/system.h
+++ b/arch/arm/mach-integrator/include/mach/system.h
@@ -30,8 +30,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-iop13xx/include/mach/system.h b/arch/arm/mach-iop13xx/include/mach/system.h
index 7f798dc8a3fd..1f31ed3f8ae2 100644
--- a/arch/arm/mach-iop13xx/include/mach/system.h
+++ b/arch/arm/mach-iop13xx/include/mach/system.h
@@ -11,7 +11,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-iop32x/include/mach/system.h b/arch/arm/mach-iop32x/include/mach/system.h
index 44e46f2d57f4..4a88727bca98 100644
--- a/arch/arm/mach-iop32x/include/mach/system.h
+++ b/arch/arm/mach-iop32x/include/mach/system.h
@@ -11,7 +11,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-iop33x/include/mach/system.h b/arch/arm/mach-iop33x/include/mach/system.h
index 696d88c0ef31..4f98e765397c 100644
--- a/arch/arm/mach-iop33x/include/mach/system.h
+++ b/arch/arm/mach-iop33x/include/mach/system.h
@@ -11,7 +11,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-ixp2000/include/mach/system.h b/arch/arm/mach-ixp2000/include/mach/system.h
index e981fd2fefee..a7fb08b2b8e7 100644
--- a/arch/arm/mach-ixp2000/include/mach/system.h
+++ b/arch/arm/mach-ixp2000/include/mach/system.h
@@ -12,7 +12,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-ixp23xx/include/mach/system.h b/arch/arm/mach-ixp23xx/include/mach/system.h
index 7a1b96ae258d..277dda7334b9 100644
--- a/arch/arm/mach-ixp23xx/include/mach/system.h
+++ b/arch/arm/mach-ixp23xx/include/mach/system.h
@@ -14,7 +14,3 @@ static inline void arch_idle(void)
 		cpu_do_idle();
 #endif
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-ixp4xx/include/mach/system.h b/arch/arm/mach-ixp4xx/include/mach/system.h
index 72db2bbb6834..140a9bef4466 100644
--- a/arch/arm/mach-ixp4xx/include/mach/system.h
+++ b/arch/arm/mach-ixp4xx/include/mach/system.h
@@ -17,7 +17,3 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 #endif
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-kirkwood/include/mach/system.h b/arch/arm/mach-kirkwood/include/mach/system.h
index 8a94d9739136..5fddde002b5e 100644
--- a/arch/arm/mach-kirkwood/include/mach/system.h
+++ b/arch/arm/mach-kirkwood/include/mach/system.h
@@ -14,8 +14,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-ks8695/include/mach/system.h b/arch/arm/mach-ks8695/include/mach/system.h
index d6de241860bb..59fe992395bf 100644
--- a/arch/arm/mach-ks8695/include/mach/system.h
+++ b/arch/arm/mach-ks8695/include/mach/system.h
@@ -24,8 +24,4 @@ static void arch_idle(void)
 
 }
 
-static void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-lpc32xx/include/mach/system.h b/arch/arm/mach-lpc32xx/include/mach/system.h
index 9c6cc0c7dd46..bf176c991520 100644
--- a/arch/arm/mach-lpc32xx/include/mach/system.h
+++ b/arch/arm/mach-lpc32xx/include/mach/system.h
@@ -24,8 +24,4 @@ static void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-mmp/include/mach/system.h b/arch/arm/mach-mmp/include/mach/system.h
index c434f3a862fe..1d001eab81e1 100644
--- a/arch/arm/mach-mmp/include/mach/system.h
+++ b/arch/arm/mach-mmp/include/mach/system.h
@@ -13,8 +13,4 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
 #endif /* __ASM_MACH_SYSTEM_H */
diff --git a/arch/arm/mach-msm/include/mach/system.h b/arch/arm/mach-msm/include/mach/system.h
index e180e8b4598a..311db2b35da0 100644
--- a/arch/arm/mach-msm/include/mach/system.h
+++ b/arch/arm/mach-msm/include/mach/system.h
@@ -14,10 +14,6 @@
  */
 void arch_idle(void);
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 /* low level hardware reset hook -- for example, hitting the
  * PSHOLD line on the PMIC to hard reset the system
  */
diff --git a/arch/arm/mach-mv78xx0/include/mach/system.h b/arch/arm/mach-mv78xx0/include/mach/system.h
index 1ae3585f18d1..8c3a5387cec7 100644
--- a/arch/arm/mach-mv78xx0/include/mach/system.h
+++ b/arch/arm/mach-mv78xx0/include/mach/system.h
@@ -14,9 +14,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
-
 #endif
diff --git a/arch/arm/mach-mxs/include/mach/system.h b/arch/arm/mach-mxs/include/mach/system.h
index bcd8989285d6..e7ad1bb29423 100644
--- a/arch/arm/mach-mxs/include/mach/system.h
+++ b/arch/arm/mach-mxs/include/mach/system.h
@@ -22,8 +22,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif /* __MACH_MXS_SYSTEM_H__ */
diff --git a/arch/arm/mach-netx/include/mach/system.h b/arch/arm/mach-netx/include/mach/system.h
index 83ae2b13a954..b38fa36d58c4 100644
--- a/arch/arm/mach-netx/include/mach/system.h
+++ b/arch/arm/mach-netx/include/mach/system.h
@@ -24,9 +24,5 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
 
diff --git a/arch/arm/mach-nomadik/include/mach/system.h b/arch/arm/mach-nomadik/include/mach/system.h
index 16f59f67eee1..25e198b8976c 100644
--- a/arch/arm/mach-nomadik/include/mach/system.h
+++ b/arch/arm/mach-nomadik/include/mach/system.h
@@ -29,8 +29,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-orion5x/include/mach/system.h b/arch/arm/mach-orion5x/include/mach/system.h
index 667767735144..825a2650cefa 100644
--- a/arch/arm/mach-orion5x/include/mach/system.h
+++ b/arch/arm/mach-orion5x/include/mach/system.h
@@ -16,8 +16,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-picoxcell/include/mach/system.h b/arch/arm/mach-picoxcell/include/mach/system.h
index a12da634fddf..1a5d8cb57df4 100644
--- a/arch/arm/mach-picoxcell/include/mach/system.h
+++ b/arch/arm/mach-picoxcell/include/mach/system.h
@@ -23,8 +23,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(int mode, const char *cmd)
-{
-}
-
 #endif /* __ASM_ARCH_SYSTEM_H */
diff --git a/arch/arm/mach-pnx4008/include/mach/system.h b/arch/arm/mach-pnx4008/include/mach/system.h
index 6710ed347325..60cfe7188091 100644
--- a/arch/arm/mach-pnx4008/include/mach/system.h
+++ b/arch/arm/mach-pnx4008/include/mach/system.h
@@ -26,8 +26,4 @@ static void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-prima2/include/mach/system.h b/arch/arm/mach-prima2/include/mach/system.h
index eb16b4bf570b..2c7d2a9d0c92 100644
--- a/arch/arm/mach-prima2/include/mach/system.h
+++ b/arch/arm/mach-prima2/include/mach/system.h
@@ -14,8 +14,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-pxa/include/mach/system.h b/arch/arm/mach-pxa/include/mach/system.h
index 85494ff7a450..c5afacd3cc0b 100644
--- a/arch/arm/mach-pxa/include/mach/system.h
+++ b/arch/arm/mach-pxa/include/mach/system.h
@@ -13,7 +13,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-realview/include/mach/system.h b/arch/arm/mach-realview/include/mach/system.h
index 1630766eeb5c..471b671159ce 100644
--- a/arch/arm/mach-realview/include/mach/system.h
+++ b/arch/arm/mach-realview/include/mach/system.h
@@ -30,8 +30,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-rpc/include/mach/system.h b/arch/arm/mach-rpc/include/mach/system.h
index e9fb5933277e..359bab94b6af 100644
--- a/arch/arm/mach-rpc/include/mach/system.h
+++ b/arch/arm/mach-rpc/include/mach/system.h
@@ -11,7 +11,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-s3c2410/include/mach/system-reset.h b/arch/arm/mach-s3c2410/include/mach/system-reset.h
deleted file mode 100644
index e71dc5fdd3e3..000000000000
--- a/arch/arm/mach-s3c2410/include/mach/system-reset.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* arch/arm/mach-s3c2410/include/mach/system-reset.h
- *
- * Copyright (c) 2008 Simtec Electronics
- *	Ben Dooks <ben@simtec.co.uk>
- *
- * S3C2410 - System define for arch_reset() function
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
-
-static void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-s3c2410/include/mach/system.h b/arch/arm/mach-s3c2410/include/mach/system.h
index eef8f24628e3..5e215c1a5c8f 100644
--- a/arch/arm/mach-s3c2410/include/mach/system.h
+++ b/arch/arm/mach-s3c2410/include/mach/system.h
@@ -52,5 +52,3 @@ static void arch_idle(void)
 	else
 		s3c24xx_default_idle();
 }
-
-#include <mach/system-reset.h>
diff --git a/arch/arm/mach-s3c64xx/include/mach/system.h b/arch/arm/mach-s3c64xx/include/mach/system.h
index 51bc8eb046de..353ed4389ae7 100644
--- a/arch/arm/mach-s3c64xx/include/mach/system.h
+++ b/arch/arm/mach-s3c64xx/include/mach/system.h
@@ -16,8 +16,4 @@ static void arch_idle(void)
 	/* nothing here yet */
 }
 
-static void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif /* __ASM_ARCH_IRQ_H */
diff --git a/arch/arm/mach-s5p64x0/include/mach/system.h b/arch/arm/mach-s5p64x0/include/mach/system.h
index 60f57532c970..cf26e0954a2f 100644
--- a/arch/arm/mach-s5p64x0/include/mach/system.h
+++ b/arch/arm/mach-s5p64x0/include/mach/system.h
@@ -13,8 +13,6 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-#include <plat/system-reset.h>
-
 static void arch_idle(void)
 {
 	/* nothing here yet */
diff --git a/arch/arm/mach-s5pc100/include/mach/system.h b/arch/arm/mach-s5pc100/include/mach/system.h
index a9ea57c06600..afc96c298518 100644
--- a/arch/arm/mach-s5pc100/include/mach/system.h
+++ b/arch/arm/mach-s5pc100/include/mach/system.h
@@ -11,8 +11,6 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-#include <plat/system-reset.h>
-
 static void arch_idle(void)
 {
 	/* nothing here yet */
diff --git a/arch/arm/mach-s5pv210/include/mach/system.h b/arch/arm/mach-s5pv210/include/mach/system.h
index af8a200b2135..bf288ced860a 100644
--- a/arch/arm/mach-s5pv210/include/mach/system.h
+++ b/arch/arm/mach-s5pv210/include/mach/system.h
@@ -13,8 +13,6 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-#include <plat/system-reset.h>
-
 static void arch_idle(void)
 {
 	/* nothing here yet */
diff --git a/arch/arm/mach-sa1100/include/mach/system.h b/arch/arm/mach-sa1100/include/mach/system.h
index 3c3e8426b405..e17b208f76d4 100644
--- a/arch/arm/mach-sa1100/include/mach/system.h
+++ b/arch/arm/mach-sa1100/include/mach/system.h
@@ -7,7 +7,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-shark/include/mach/system.h b/arch/arm/mach-shark/include/mach/system.h
index 2cc363a3cd90..1b2f2c5050a8 100644
--- a/arch/arm/mach-shark/include/mach/system.h
+++ b/arch/arm/mach-shark/include/mach/system.h
@@ -6,10 +6,6 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 static inline void arch_idle(void)
 {
 }
diff --git a/arch/arm/mach-tegra/include/mach/system.h b/arch/arm/mach-tegra/include/mach/system.h
index b87b8a4bc30a..a312988bf6f8 100644
--- a/arch/arm/mach-tegra/include/mach/system.h
+++ b/arch/arm/mach-tegra/include/mach/system.h
@@ -21,10 +21,6 @@
 #ifndef __MACH_TEGRA_SYSTEM_H
 #define __MACH_TEGRA_SYSTEM_H
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 static inline void arch_idle(void)
 {
 }
diff --git a/arch/arm/mach-u300/include/mach/system.h b/arch/arm/mach-u300/include/mach/system.h
index 0ddf3cd367c3..574d46e38290 100644
--- a/arch/arm/mach-u300/include/mach/system.h
+++ b/arch/arm/mach-u300/include/mach/system.h
@@ -12,7 +12,3 @@ static inline void arch_idle(void)
 {
 	cpu_do_idle();
 }
-
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
diff --git a/arch/arm/mach-ux500/include/mach/system.h b/arch/arm/mach-ux500/include/mach/system.h
index ae1dff1d7e65..258e5c919c24 100644
--- a/arch/arm/mach-ux500/include/mach/system.h
+++ b/arch/arm/mach-ux500/include/mach/system.h
@@ -17,8 +17,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-versatile/include/mach/system.h b/arch/arm/mach-versatile/include/mach/system.h
index 335946addf6f..f3fa347895f0 100644
--- a/arch/arm/mach-versatile/include/mach/system.h
+++ b/arch/arm/mach-versatile/include/mach/system.h
@@ -30,8 +30,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-vexpress/include/mach/system.h b/arch/arm/mach-vexpress/include/mach/system.h
index 899a4e628a4c..f653a8e265bd 100644
--- a/arch/arm/mach-vexpress/include/mach/system.h
+++ b/arch/arm/mach-vexpress/include/mach/system.h
@@ -30,8 +30,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/mach-w90x900/include/mach/system.h b/arch/arm/mach-w90x900/include/mach/system.h
index 001a2f93a1e2..2aaeb9311619 100644
--- a/arch/arm/mach-w90x900/include/mach/system.h
+++ b/arch/arm/mach-w90x900/include/mach/system.h
@@ -17,8 +17,3 @@
 static void arch_idle(void)
 {
 }
-
-static void arch_reset(char mode, const char *cmd)
-{
-}
-
diff --git a/arch/arm/mach-zynq/include/mach/system.h b/arch/arm/mach-zynq/include/mach/system.h
index 34be7ed4b678..8e88e0b8d2ba 100644
--- a/arch/arm/mach-zynq/include/mach/system.h
+++ b/arch/arm/mach-zynq/include/mach/system.h
@@ -20,8 +20,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/plat-mxc/include/mach/system.h b/arch/arm/plat-mxc/include/mach/system.h
index c21c12d14c1c..13ad0df2e860 100644
--- a/arch/arm/plat-mxc/include/mach/system.h
+++ b/arch/arm/plat-mxc/include/mach/system.h
@@ -22,8 +22,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif /* __ASM_ARCH_MXC_SYSTEM_H__ */
diff --git a/arch/arm/plat-omap/include/plat/system.h b/arch/arm/plat-omap/include/plat/system.h
index 910f15ff8c8d..8e5ebd74b129 100644
--- a/arch/arm/plat-omap/include/plat/system.h
+++ b/arch/arm/plat-omap/include/plat/system.h
@@ -12,8 +12,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif
diff --git a/arch/arm/plat-samsung/include/plat/system-reset.h b/arch/arm/plat-samsung/include/plat/system-reset.h
deleted file mode 100644
index 73d7808a26f1..000000000000
--- a/arch/arm/plat-samsung/include/plat/system-reset.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* linux/arch/arm/plat-samsung/include/plat/system-reset.h
- *
- * Copyright (c) 2010 Samsung Electronics Co., Ltd.
- *		http://www.samsung.com
- *
- * Based on arch/arm/mach-s3c2410/include/mach/system-reset.h
- *
- * S5P - System define for arch_reset()
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
-
-#include <plat/watchdog-reset.h>
-
-static void arch_reset(char mode, const char *cmd)
-{
-	arch_wdt_reset();
-}
diff --git a/arch/arm/plat-spear/include/plat/system.h b/arch/arm/plat-spear/include/plat/system.h
index 4a0d125260a8..86c6f83b44cc 100644
--- a/arch/arm/plat-spear/include/plat/system.h
+++ b/arch/arm/plat-spear/include/plat/system.h
@@ -23,8 +23,4 @@ static inline void arch_idle(void)
 	cpu_do_idle();
 }
 
-static inline void arch_reset(char mode, const char *cmd)
-{
-}
-
 #endif /* __PLAT_SYSTEM_H */
-- 
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