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2013-10-01Merge git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2-4/+6
Pull two KVM fixes from Gleb Natapov. * git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: VMX: do not check bit 12 of EPT violation exit qualification when undefined ARM: kvm: rename cpu_reset to avoid name clash
2013-10-01arch/parisc/mm/fault.c: fix uninitialized variable usageFelipe Pena1-2/+3
The FAULT_FLAG_WRITE flag has been set based on uninitialized variable. Fixes a regression added by commit 759496ba6407 ("arch: mm: pass userspace fault flag to generic fault handler") Signed-off-by: Felipe Pena <felipensp@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-30Merge branch 'for-linus' of ↵Linus Torvalds17-73/+24
git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32 Pull AVR32 fixes from Hans-Christian Egtvedt. Fix build warnings and use the Kbuild infrastructure for generic headers rather than doing it by hand. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32: avr32: cast syscall_return to silence compiler warning avr32: fix clockevents kernel warning avr32: use Kbuild infrastructure to handle the asm-generic headers
2013-09-30Merge tag 'for-linus-20130929' of git://github.com/sctscore/official-linuxLinus Torvalds7-50/+62
Pull S+core fixes from Lennox Wu: "These updates include updating information of maintainers, fix some trivial errors, and add a necessary function for supporting ipv6" * tag 'for-linus-20130929' of git://github.com/sctscore/official-linux: Score: Update the information of Score maintaners Score: Modify the Makefile of Score, remove -mlong-calls for compiling Score: Implement the function csum_ipv6_magic Score: The commit is for compiling successfully
2013-09-30Merge tag 'arc-fixes-for-3.12' of ↵Linus Torvalds4-8/+18
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC Fixes from Vineet Gupta: - Handle unaligned access in zero delay loops - spinlock livelock fix for SMP systemC model - fix 32bit overflow in access_ok - better setup of clockevents * tag 'arc-fixes-for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: Use clockevents_config_and_register over clockevents_register_device ARC: Workaround spinlock livelock in SMP SystemC simulation ARC: Fix 32-bit wrap around in access_ok() ARC: Handle zero-overhead-loop in unaligned access handler
2013-09-30avr32: cast syscall_return to silence compiler warningGabor Juhos1-1/+1
The patch fixes the following compiler warning: CC arch/avr32/kernel/process.o arch/avr32/kernel/process.c: In function 'copy_thread': arch/avr32/kernel/process.c:292: warning: assignment makes integer \ from pointer without a cast Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
2013-09-30avr32: fix clockevents kernel warningGabor Juhos1-1/+8
Since commit 01426478df3a8791ff5c8b6b82d409e699cfaf38 (avr32: Use generic idle loop) the kernel throws the following warning on avr32: WARNING: at 900322e4 [verbose debug info unavailable] Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc2 #117 task: 901c3ecc ti: 901c0000 task.ti: 901c0000 PC is at cpu_idle_poll_ctrl+0x1c/0x38 LR is at comparator_mode+0x3e/0x40 pc : [<900322e4>] lr : [<90014882>] Not tainted sp : 901c1f74 r12: 00000000 r11: 901c74a0 r10: 901d2510 r9 : 00000001 r8 : 901db4de r7 : 901c74a0 r6 : 00000001 r5 : 00410020 r4 : 901db574 r3 : 00410024 r2 : 90206fe0 r1 : 00000000 r0 : 007f0000 Flags: qvnzc Mode bits: hjmde....G CPU Mode: Supervisor Call trace: [<90039ede>] clockevents_set_mode+0x16/0x2e [<90039f00>] clockevents_shutdown+0xa/0x1e [<9003a078>] clockevents_exchange_device+0x58/0x70 [<9003a78c>] tick_check_new_device+0x38/0x54 [<9003a1a2>] clockevents_register_device+0x32/0x90 [<900035c4>] time_init+0xa8/0x108 [<90000520>] start_kernel+0x128/0x23c When the 'avr32_comparator' clockevent device is registered, the clockevent core sets the mode of that clockevent device to CLOCK_EVT_MODE_SHUTDOWN. Due to this, the 'comparator_mode' function calls the 'cpu_idle_poll_ctrl' to disables idle poll. This results in the aforementioned warning because the polling is not enabled yet. Change the code to only disable idle poll if it is enabled by the same function to avoid the warning. Cc: stable@vger.kernel.org Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
2013-09-30avr32: use Kbuild infrastructure to handle the asm-generic headersSteven Rostedt15-71/+15
Use kbuild to add asm-generic headers that do nothing, also remove the arch specific wrapper headers. This only affects headers that do nothing but include the generic equivalent. It does not touch any header that does a little more. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
2013-09-29Merge branches 'sched-urgent-for-linus', 'timers-urgent-for-linus' and ↵Linus Torvalds2-4/+5
'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler, timer and x86 fixes from Ingo Molnar: - A context tracking ARM build and functional fix - A handful of ARM clocksource/clockevent driver fixes - An AMD microcode patch level sysfs reporting fixlet * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: arm: Fix build error with context tracking calls * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: clocksource: em_sti: Set cpu_possible_mask to fix SMP broadcast clocksource: of: Respect device tree node status clocksource: exynos_mct: Set IRQ affinity when the CPU goes online arm: clocksource: mvebu: Use the main timer as clock source from DT * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/microcode/AMD: Fix patch level reporting for family 15h
2013-09-29Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fixes from Ingo Molnar: "A couple of tooling fixlets and a PMU detection printout fix" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86: Fix PMU detection printout when no PMU is detected perf symbols: Demangle cloned functions perf machine: Fix path unpopulated in machine__create_modules() perf tools: Explicitly add libdl dependency perf probe: Fix probing symbols with optimization suffix perf trace: Add mmap2 handler perf kmem: Make it work again on non NUMA machines
2013-09-28Merge branch 'lockref' of ↵Linus Torvalds5-6/+8
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 lockref enablement from Heiko Carstens: "Enabling the new lockless lockref variant on s390 would have been trivial until Tony Luck added a cpu_relax() call into the CMPXCHG_LOOP(), with commit d472d9d98b46 ("lockref: Relax in cmpxchg loop") As already mentioned cpu_relax() is very expensive on s390 since it yields() the current virtual cpu. So we are talking of several thousand cycles. Considering this enabling the lockless lockref variant would contradict the intention of the new semantics. And also some quick measurements show performance regressions of 50% and more. Simply removing the cpu_relax() call again seems also not very desireable since Waiman Long reported that for some workloads the call improved performance by 5%." * 'lockref' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390: enable ARCH_USE_CMPXCHG_LOCKREF lockref: use arch_mutex_cpu_relax() in CMPXCHG_LOOP() mutex: replace CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX with simple ifdef
2013-09-28Merge tag 'devicetree-fixes' of ↵Linus Torvalds1-44/+0
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull DeviceTree fixes from Rob Herring: "Clean-up to fix some warnings for !OF builds and spelling fixes in docs: - Clean-up openrisc prom.h - Fix warnings caused by of_irq.h ifdefs - Spelling fix for Synopsys" * tag 'devicetree-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: dts: Fix misspelling of Synopsys of: clean-up ifdefs in of_irq.h openrisc: clean-up prom.h
2013-09-28Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds4-7/+13
Pull ARM fixes from Russell King: "Just a few relatively small ARM fixes found since the last merge window, nothing too exciting" * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: 7837/3: fix Thumb-2 bug in AES assembler code ARM: only allow kernel mode neon with AEABI ARM: 7839/1: entry: fix tracing of ARM-private syscalls ARM: 7836/1: add __get_user_unaligned/__put_user_unaligned
2013-09-28perf/x86: Fix PMU detection printout when no PMU is detectedIngo Molnar1-1/+1
Ran into this cryptic PMU bootup log recently: [ 0.124047] Performance Events: [ 0.125000] smpboot: ... Turns out we print this if no PMU is detected. Fall back to the right condition so that the following is printed: [ 0.122381] Performance Events: no PMU driver, software events only. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Link: http://lkml.kernel.org/n/tip-u2fwaUffakjp0qkpRfqljgsn@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-09-28s390: enable ARCH_USE_CMPXCHG_LOCKREFHeiko Carstens2-0/+6
Enable ARCH_USE_CMPXCHG_LOCKREF since it shows performance improvements with Linus' simple stat() test case of up to 50% on a 30 cpu system. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2013-09-28mutex: replace CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX with simple ifdefHeiko Carstens4-6/+2
Linus suggested to replace #ifndef CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX #define arch_mutex_cpu_relax() cpu_relax() #endif with just a simple #ifndef arch_mutex_cpu_relax # define arch_mutex_cpu_relax() cpu_relax() #endif to get rid of CONFIG_HAVE_CPU_RELAX_SIMPLE. So architectures can simply define arch_mutex_cpu_relax if they want an architecture specific function instead of having to add a select statement in their Kconfig in addition. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2013-09-28Merge branch 'context_tracking/fixes' of ↵Ingo Molnar1-4/+4
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into sched/urgent Pull context tracking ARM fix from Frederic Weisbecker. Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-09-27arm: Fix build error with context tracking callsFrederic Weisbecker1-4/+4
ad65782fba50 (context_tracking: Optimize main APIs off case with static key) converted context tracking main APIs to inline function and left ARM asm callers behind. This can be easily fixed by making ARM calling the post static keys context tracking function. We just need to replicate the static key checks there. We'll remove these later when ARM will support the context tracking static keys. Reported-by: Guenter Roeck <linux@roeck-us.net> Reported-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Tested-by: Kevin Hilman <khilman@linaro.org> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Anil Kumar <anilk4.v@gmail.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Benoit Cousson <b-cousson@ti.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Kevin Hilman <khilman@linaro.org>
2013-09-27ARC: Use clockevents_config_and_register over clockevents_register_deviceUwe Kleine-König1-5/+2
clockevents_config_and_register is more clever and correct than doing it by hand; so use it. [vgupta: fixed build failure due to missing ; in patch] Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-09-27ARC: Workaround spinlock livelock in SMP SystemC simulationVineet Gupta1-1/+8
Some ARC SMP systems lack native atomic R-M-W (LLOCK/SCOND) insns and can only use atomic EX insn (reg with mem) to build higher level R-M-W primitives. This includes a SystemC based SMP simulation model. So rwlocks need to use a protecting spinlock for atomic cmp-n-exchange operation to update reader(s)/writer count. The spinlock operation itself looks as follows: mov reg, 1 ; 1=locked, 0=unlocked retry: EX reg, [lock] ; load existing, store 1, atomically BREQ reg, 1, rety ; if already locked, retry In single-threaded simulation, SystemC alternates between the 2 cores with "N" insn each based scheduling. Additionally for insn with global side effect, such as EX writing to shared mem, a core switch is enforced too. Given that, 2 cores doing a repeated EX on same location, Linux often got into a livelock e.g. when both cores were fiddling with tasklist lock (gdbserver / hackbench) for read/write respectively as the sequence diagram below shows: core1 core2 -------- -------- 1. spin lock [EX r=0, w=1] - LOCKED 2. rwlock(Read) - LOCKED 3. spin unlock [ST 0] - UNLOCKED spin lock [EX r=0,w=1] - LOCKED -- resched core 1---- 5. spin lock [EX r=1] - ALREADY-LOCKED -- resched core 2---- 6. rwlock(Write) - READER-LOCKED 7. spin unlock [ST 0] 8. rwlock failed, retry again 9. spin lock [EX r=0, w=1] -- resched core 1---- 10 spinlock locked in #9, retry #5 11. spin lock [EX gets 1] -- resched core 2---- ... ... The fix was to unlock using the EX insn too (step 7), to trigger another SystemC scheduling pass which would let core1 proceed, eliding the livelock. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-09-27ARC: Fix 32-bit wrap around in access_ok()Vineet Gupta1-2/+2
Anton reported | LTP tests syscalls/process_vm_readv01 and process_vm_writev01 fail | similarly in one testcase test_iov_invalid -> lvec->iov_base. | Testcase expects errno EFAULT and return code -1, | but it gets return code 1 and ERRNO is 0 what means success. Essentially test case was passing a pointer of -1 which access_ok() was not catching. It was doing [@addr + @sz <= TASK_SIZE] which would pass for @addr == -1 Fixed that by rewriting as [@addr <= TASK_SIZE - @sz] Reported-by: Anton Kolesov <Anton.Kolesov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-09-27ARC: Handle zero-overhead-loop in unaligned access handlerMischa Jonker1-0/+6
If a load or store is the last instruction in a zero-overhead-loop, and it's misaligned, the loop would execute only once. This fixes that problem. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-09-27x86/microcode/AMD: Fix patch level reporting for family 15hSuravee Suthikulpanit1-0/+1
On AMD family 14h, applying microcode patch on the a core (core0) would also affect the other core (core1) in the same compute unit. The driver would skip applying the patch on core1, but it still need to update kernel structures to reflect the proper patch level. The current logic is not updating the struct ucode_cpu_info.cpu_sig.rev of the skipped core. This causes the /sys/devices/system/cpu/cpu1/microcode/version to report incorrect patch level as shown below: $ grep . cpu?/microcode/version cpu0/microcode/version:0x600063d cpu1/microcode/version:0x6000626 cpu2/microcode/version:0x600063d cpu3/microcode/version:0x6000626 cpu4/microcode/version:0x600063d Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Acked-by: Borislav Petkov <bp@suse.de> Cc: <bp@alien8.de> Cc: <jacob.w.shin@gmail.com> Cc: <herrmann.der.user@googlemail.com> Link: http://lkml.kernel.org/r/1285806432-1995-1-git-send-email-suravee.suthikulpanit@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-09-26Merge tag 'stable/for-linus-3.12-rc2-tag' of ↵Linus Torvalds3-19/+48
git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip Pull Xen fixes from Konrad Rzeszutek Wilk: "Bug-fixes and one update to the kernel-paramters.txt documentation. - Fix PV spinlocks triggering jump_label code bug - Remove extraneous code in the tpm front driver - Fix ballooning out of pages when non-preemptible - Fix deadlock when using a 32-bit initial domain with large amount of memory - Add xen_nopvpsin parameter to the documentation" * tag 'stable/for-linus-3.12-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/spinlock: Document the xen_nopvspin parameter. xen/p2m: check MFN is in range before using the m2p table xen/balloon: don't alloc page while non-preemptible xen: Do not enable spinlocks before jump_label_init() has executed tpm: xen-tpmfront: Remove the locality sysfs attribute tpm: xen-tpmfront: Fix default durations
2013-09-26Merge git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds2-9/+5
Pull MIPS fixes from Ralf Baechle: - Fix a comment - A small cleanup the main purpose of which is to work around an internal compiler error bug in certain Codesource toolchains. * git://git.linux-mips.org/pub/scm/ralf/upstream-linus: MIPS: mm: Move some checks out of 'for' loop in DMA operations MIPS: cpu-features.h: s/MIPS53/MIPS64/
2013-09-26Merge branch 'merge' of ↵Linus Torvalds15-94/+147
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc Pull powerpc fixes from Ben Herrenschmidt: "Here are a few things for -rc2, this time it's all written by me so it can only be perfect .... right ? :) So we have the fix to call irq_enter/exit on the irq stack we've been discussing, plus a cleanup on top to remove an unused (and broken) stack limit tracking feature (well, make it 32-bit only in fact where it is used and works properly). Then we have two things that I wrote over the last couple of days and made the executive decision to include just because I can (and I'm sure you won't object .... right ?). They fix a couple of annoying and long standing "issues": - We had separate zImages for when booting via Open Firmware vs. booting via a flat device-tree, while it's trivial to make one that deals with both - We wasted a ton of cycles spinning secondary CPUs uselessly at boot instead of starting them when needed on pseries, thus contributing significantly to global warming" * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc/pseries: Do not start secondaries in Open Firmware powerpc/zImage: make the "OF" wrapper support ePAPR boot powerpc: Remove ksp_limit on ppc64 powerpc/irq: Run softirqs off the top of the irq stack
2013-09-26Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds2-5/+24
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fixes from Ingo Molnar: "An EFI fix and two reboot-quirk fixes" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/reboot: Fix apparent cut-n-paste mistake in Dell reboot workaround x86/reboot: Add quirk to make Dell C6100 use reboot=pci automatically x86, efi: Don't map Boot Services on i386
2013-09-26Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds3-10/+11
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fixes from Ingo Molnar: "Assorted standalone fixes" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel: Add model number for Avoton Silvermont perf: Fix capabilities bitfield compatibility in 'struct perf_event_mmap_page' perf/x86/intel/uncore: Don't use smp_processor_id() in validate_group() perf: Update ABI comment tools lib lk: Uninclude linux/magic.h in debugfs.c perf tools: Fix old GCC build error in trace-event-parse.c:parse_proc_kallsyms() perf probe: Fix finder to find lines of given function perf session: Check for SIGINT in more loops perf tools: Fix compile with libelf without get_phdrnum perf tools: Fix buildid cache handling of kallsyms with kcore perf annotate: Fix objdump line parsing offset validation perf tools: Fill in new definitions for madvise()/mmap() flags perf tools: Sharpen the libaudit dependencies test
2013-09-25Score: Modify the Makefile of Score, remove -mlong-calls for compilingLennox Wu1-2/+2
Signed-off-by: Lennox Wu <lennox.wu@gmail.com>
2013-09-25Score: Implement the function csum_ipv6_magicLennox Wu1-42/+51
Signed-off-by: Lennox Wu <lennox.wu@gmail.com>
2013-09-25Score: The commit is for compiling successfully.Lennox Wu5-6/+9
The modifications include: 1. Kconfig of Score: we don't support ioremap 2. Missed headfile including 3. There are some errors in other people's commit not checked by us, we fix it now 3.1 arch/score/kernel/entry.S: wrong instructions 3.2 arch/score/kernel/process.c : just some typos Signed-off-by: Lennox Wu <lennox.wu@gmail.com>
2013-09-25MIPS: mm: Move some checks out of 'for' loop in DMA operationsJayachandran C1-8/+4
The check cpu_needs_post_dma_flush() in mips_dma_sync_sg_for_cpu() and the check !plat_device_is_coherent() in mips_dma_sync_sg_for_device() can be moved outside the for loop. As a side effect, this also avoids a GCC bug that caused kernel compile to fail with the error: arch/mips/mm/dma-default.c: In function 'mips_dma_sync_sg_for_cpu': arch/mips/mm/dma-default.c:316:1: internal compiler error: in add_insn_before, at emit-rtl.c:3852 This gcc failure is seen in Code Sourcery toolchains [e.g. gcc version 4.7.2 (Sourcery CodeBench Lite 2012.09-99)] after commit "MIPS: Optimize current_cpu_type() for better code." Signed-off-by: Jayachandran C <jchandra@broadcom.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5907/ Reviewed-by: Markos Chandras <markos.chandras@imgtec.com> Tested-by: Markos Chandras <markos.chandras@imgtec.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-09-25xen/p2m: check MFN is in range before using the m2p tableDavid Vrabel2-17/+24
On hosts with more than 168 GB of memory, a 32-bit guest may attempt to grant map an MFN that is error cannot lookup in its mapping of the m2p table. There is an m2p lookup as part of m2p_add_override() and m2p_remove_override(). The lookup falls off the end of the mapped portion of the m2p and (because the mapping is at the highest virtual address) wraps around and the lookup causes a fault on what appears to be a user space address. do_page_fault() (thinking it's a fault to a userspace address), tries to lock mm->mmap_sem. If the gntdev device is used for the grant map, m2p_add_override() is called from from gnttab_mmap() with mm->mmap_sem already locked. do_page_fault() then deadlocks. The deadlock would most commonly occur when a 64-bit guest is started and xenconsoled attempts to grant map its console ring. Introduce mfn_to_pfn_no_overrides() which checks the MFN is within the mapped portion of the m2p table before accessing the table and use this in m2p_add_override(), m2p_remove_override(), and mfn_to_pfn() (which already had the correct range check). All faults caused by accessing the non-existant parts of the m2p are thus within the kernel address space and exception_fixup() is called without trying to lock mm->mmap_sem. This means that for MFNs that are outside the mapped range of the m2p then mfn_to_pfn() will always look in the m2p overrides. This is correct because it must be a foreign MFN (and the PFN in the m2p in this case is only relevant for the other domain). Signed-off-by: David Vrabel <david.vrabel@citrix.com> Cc: Stefano Stabellini <stefano.stabellini@citrix.com> Cc: Jan Beulich <JBeulich@suse.com> -- v3: check for auto_translated_physmap in mfn_to_pfn_no_overrides() v2: in mfn_to_pfn() look in m2p_overrides if the MFN is out of range as it's probably foreign. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2013-09-25KVM: VMX: do not check bit 12 of EPT violation exit qualification when undefinedGleb Natapov1-1/+3
Bit 12 is undefined in any of the following cases: - If the "NMI exiting" VM-execution control is 1 and the "virtual NMIs" VM-execution control is 0. - If the VM exit sets the valid bit in the IDT-vectoring information field Signed-off-by: Gleb Natapov <gleb@redhat.com> [Add parentheses around & within && - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-09-25x86/reboot: Fix apparent cut-n-paste mistake in Dell reboot workaroundDave Jones1-1/+1
This seems to have been copied from the Optiplex 990 entry above, but somoene forgot to change the ident text. Signed-off-by: Dave Jones <davej@fedoraproject.org> Link: http://lkml.kernel.org/r/20130925001344.GA13554@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-09-25powerpc/pseries: Do not start secondaries in Open FirmwareBenjamin Herrenschmidt2-10/+37
Starting secondary CPUs early on from Open Firmware and placing them in a holding spin loop slows down the boot process significantly under some hypervisors such as KVM. This is also unnecessary when RTAS supports querying the CPU state So let's not do it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-09-25powerpc/zImage: make the "OF" wrapper support ePAPR bootBenjamin Herrenschmidt5-9/+33
This makes the "OF" zImage wrapper (zImage.pseries, zImage.pmac, zImage.maple) work if booted via a flat device-tree (ePAPR boot mode), and thus potentially usable with kexec. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-09-25powerpc: Remove ksp_limit on ppc64Benjamin Herrenschmidt6-18/+23
We've been keeping that field in thread_struct for a while, it contains the "limit" of the current stack pointer and is meant to be used for detecting stack overflows. It has a few problems however: - First, it was never actually *used* on 64-bit. Set and updated but not actually exploited - When switching stack to/from irq and softirq stacks, it's update is racy unless we hard disable interrupts, which is costly. This is fine on 32-bit as we don't soft-disable there but not on 64-bit. Thus rather than fixing 2 in order to implement 1 in some hypothetical future, let's remove the code completely from 64-bit. In order to avoid a clutter of ifdef's, we remove the updates from C code completely during interrupt stack switching, and instead maintain it from the asm helper that is used to do the stack switching in the first place. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-09-25powerpc/irq: Run softirqs off the top of the irq stackBenjamin Herrenschmidt4-65/+62
Nowadays, irq_exit() calls __do_softirq() pretty much directly instead of calling do_softirq() which switches to the decicated softirq stack. This has lead to observed stack overflows on powerpc since we call irq_enter() and irq_exit() outside of the scope that switches to the irq stack. This fixes it by moving the stack switching up a level, making irq_enter() and irq_exit() run off the irq stack. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-09-25openrisc: clean-up prom.hRob Herring1-44/+0
Clean-up some copy/paste declarations that are not necessary. All the functions either don't exist or are already declared in other headers. This is needed in preparation of of_irq.h clean-up. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: linux@lists.openrisc.net
2013-09-25xen: Do not enable spinlocks before jump_label_init() has executedKonrad Rzeszutek Wilk1-2/+24
xen_init_spinlocks() currently calls static_key_slow_inc() before jump_label_init() is invoked. When CONFIG_JUMP_LABEL is set (which usually is the case) the effect of this static_key_slow_inc() is deferred until after jump_label_init(). This is different from when CONFIG_JUMP_LABEL is not set, in which case the key is set immediately. Thus, depending on the value of config option, we may observe different behavior. In addition, when we come to __jump_label_transform() from jump_label_init(), the key (paravirt_ticketlocks_enabled) is already enabled. On processors where ideal_nop is not the same as default_nop this will cause a BUG() since it is expected that before a key is enabled the latter is replaced by the former during initialization. To address this problem we need to move static_key_slow_inc(&paravirt_ticketlocks_enabled) so that it is called after jump_label_init(). We also need to make sure that this is done before other cpus start to boot. early_initcall appears to be a good place to do so. (Note that we cannot move whole xen_init_spinlocks() there since pv_lock_ops need to be set before alternative_instructions() runs.) Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [v2: Added extra comments in the code] Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
2013-09-24ARM: kvm: rename cpu_reset to avoid name clashOlof Johansson1-3/+3
cpu_reset is already #defined in <asm/proc-fns.h> as processor.reset, so it expands here and causes problems. Cc: <stable@vger.kernel.org> Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2013-09-24MIPS: cpu-features.h: s/MIPS53/MIPS64/Maciej W. Rozycki1-1/+1
No support for MIPS53 processors yet. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5876/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-09-23x86/reboot: Add quirk to make Dell C6100 use reboot=pci automaticallyMasoud Sharbiani1-0/+16
Dell PowerEdge C6100 machines fail to completely reboot about 20% of the time. Signed-off-by: Masoud Sharbiani <msharbiani@twitter.com> Signed-off-by: Vinson Lee <vlee@twitter.com> Cc: Robin Holt <holt@sgi.com> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: <stable@vger.kernel.org> Link: http://lkml.kernel.org/r/1379717947-18042-1-git-send-email-vlee@freedesktop.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-09-23perf/x86/intel: Add model number for Avoton SilvermontYan, Zheng1-0/+1
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Cc: a.p.zijlstra@chello.nl Cc: eranian@google.com Cc: ak@linux.intel.com Link: http://lkml.kernel.org/r/1379837953-17755-1-git-send-email-zheng.z.yan@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-09-22ARM: 7837/3: fix Thumb-2 bug in AES assembler codeArd Biesheuvel1-3/+3
Patch 638591c enabled building the AES assembler code in Thumb2 mode. However, this code used arithmetic involving PC rather than adr{l} instructions to generate PC-relative references to the lookup tables, and this needs to take into account the different PC offset when running in Thumb mode. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Nicolas Pitre <nico@linaro.org> Cc: stable@vger.kernel.org Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-09-22ARM: only allow kernel mode neon with AEABIRussell King1-2/+1
This prevents the linker erroring with: arm-linux-ld: error: arch/arm/lib/xor-neon.o uses VFP instructions, whereas arch/arm/lib/built-in.o does not arm-linux-ld: failed to merge target specific data of file arch/arm/lib/xor-neon.o This is due to the non-neon files being marked as containing FPA data/ instructions (even though they do not) being mixed with files which contain VFP, which is an incompatible floating point format. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-09-21ARM: 7839/1: entry: fix tracing of ARM-private syscallsWill Deacon1-2/+2
Commit 377747c40657 ("ARM: entry: allow ARM-private syscalls to be restarted") reworked the low-level syscall dispatcher to allow restarting of ARM-private syscalls. Unfortunately, this relocated the label used to dispatch a private syscall from the trace path, so that the invocation would be bypassed altogether! This causes applications to fail under strace as soon as they rely on a private syscall (e.g. set_tls): set_tls(0xb6fad4c0, 0xb6fadb98, 0xb6fb1050, 0xb6fad4c0, 0xb6fb1050) = -1 ENOSYS (Function not implemented) This patch fixes the label so that we correctly dispatch private syscalls from the trace path. Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Tested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-09-21Merge tag 'pm+acpi-3.12-rc2' of ↵Linus Torvalds5-6/+11
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI and power management fixes from Rafael Wysocki: 1) Four fixes for cpufreq regressions introduced by the changes that removed Device Tree parsing for CPU device nodes from cpufreq drivers from Sudeep KarkadaNagesha. 2) Two fixes for recent cpufreq regressions introduced by changes related to the preservation of sysfs attributes over system suspend/resume cycles from Viresh Kumar. 3) Fix for ACPI-based wakeup signaling in the PCI subsystem that fails to stop PME polling for devices put into the D3cold power state from Rafael J Wysocki. 4) Fix for bad interactions between cpufreq and udev on systems supporting intel_pstate where acpi-cpufreq is available as well from Yinghai Lu. * tag 'pm+acpi-3.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: cpufreq: return EEXIST instead of EBUSY for second registering PCI / ACPI / PM: Clear pme_poll for devices in D3cold on wakeup ARM: shmobile: change dev_id to cpu0 while registering cpu clock ARM: i.MX: change dev_id to cpu0 while registering cpu clock cpufreq: imx6q-cpufreq: assign cpu_dev correctly to cpu0 device cpufreq: cpufreq-cpu0: assign cpu_dev correctly to cpu0 device cpufreq: unlock correct rwsem while updating policy->cpu cpufreq: Clear policy->cpus bits in __cpufreq_remove_dev_finish()
2013-09-20Merge tag 'arm64-stable' of ↵Linus Torvalds4-8/+19
git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64 Pull ARM64 fixes from Catalin Marinas: - Compat register fault reporting fix - Documentation clarification on tagged pointers - hwcap widened to 64-bit (user space already reading it as 64-bit) * tag 'arm64-stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: arm64: Widen hwcap to be 64 bit arm64: Correctly report LR and SP for compat tasks arm64: documentation: tighten up tagged pointer documentation arm64: Make do_bad_area() function static
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