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authorDavid S. Miller <davem@davemloft.net>2008-10-30 07:25:00 +0300
committerDavid S. Miller <davem@davemloft.net>2008-12-04 20:16:46 +0300
commit64f2dde3f743c8a1ad8c0a1aa74166c1034afd92 (patch)
tree5033069de9784f6c2a6f545e5dfafa97a2b430d8 /arch/sparc64/kernel
parentc9bb6003dd096ad190e1594a7d835ae1c39fae8f (diff)
downloadlinux-64f2dde3f743c8a1ad8c0a1aa74166c1034afd92.tar.xz
sparc64: Run the kernel always in the TSO memory model.
The fact of the matter is, all UltraSPARC-III and later chips only implement TSO. They don't implement PSO and RMO memory models at all. Only the Ultra-I and Ultra-II family chips implement RMO and they are only helped marginally by using this setting when executing kernel code. The big plus to doing this is that we can eliminate all of the non-Sync memory barriers in the kernel except for the ones used in the optimized memcpy/memset code (these use block load and store operations which have their own memory ordering rules). Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel')
-rw-r--r--arch/sparc64/kernel/etrap.S6
-rw-r--r--arch/sparc64/kernel/rtrap.S6
2 files changed, 6 insertions, 6 deletions
diff --git a/arch/sparc64/kernel/etrap.S b/arch/sparc64/kernel/etrap.S
index 29ce489bc188..786b185e6e3f 100644
--- a/arch/sparc64/kernel/etrap.S
+++ b/arch/sparc64/kernel/etrap.S
@@ -16,9 +16,9 @@
#include <asm/mmu.h>
#define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ)
-#define ETRAP_PSTATE1 (PSTATE_RMO | PSTATE_PRIV)
+#define ETRAP_PSTATE1 (PSTATE_TSO | PSTATE_PRIV)
#define ETRAP_PSTATE2 \
- (PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE)
+ (PSTATE_TSO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE)
/*
* On entry, %g7 is return address - 0x4.
@@ -130,7 +130,7 @@ etrap_save: save %g2, -STACK_BIAS, %sp
stx %g6, [%sp + PTREGS_OFF + PT_V9_G6]
stx %g7, [%sp + PTREGS_OFF + PT_V9_G7]
or %l7, %l0, %l7
- sethi %hi(TSTATE_RMO | TSTATE_PEF), %l0
+ sethi %hi(TSTATE_TSO | TSTATE_PEF), %l0
or %l7, %l0, %l7
wrpr %l2, %tnpc
wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index 97a993c1f7f3..6892cf556f45 100644
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -14,9 +14,9 @@
#include <asm/visasm.h>
#include <asm/processor.h>
-#define RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
-#define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV)
-#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
+#define RTRAP_PSTATE (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
+#define RTRAP_PSTATE_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV)
+#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
.text
.align 32