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2013-05-20x86: Fix bit corruption at CPU resume timeLinus Torvalds1-1/+1
In commit 78d77df71510 ("x86-64, init: Do not set NX bits on non-NX capable hardware") we added the early_pmd_flags that gets the NX bit set when a CPU supports NX. However, the new variable was marked __initdata, because the main _use_ of this is in an __init routine. However, the bit setting happens from secondary_startup_64(), which is called not only at bootup, but on every secondary CPU start. Including resuming from STR and at CPU hotplug time. So the value cannot be __initdata. Reported-bisected-and-tested-by: Michal Hocko <mhocko@suse.cz> Cc: stable@vger.kernel.org # v3.9 Acked-by: Peter Anvin <hpa@linux.intel.com> Cc: Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-05-18Merge branch 'devm_no_resource_check' of ↵Linus Torvalds3-14/+0
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull devm usage cleanup from Wolfram Sang: "Lately, I have been experimenting how to improve the devm interface to make writing device drivers easier and less error prone while also getting rid of its subtle issues. I think it has more potential but still needs work and definately conistency, especiall in its usage. The first thing I come up with is a low hanging fruit regarding devm_ioremap_resouce(). This function already checks if the passed resource is valid and gives an error message if not. So, we can remove similar checks from the drivers and get rid of a bit of code and a number of inconsistent error strings. This series only removes the unneeded check iff devm_ioremap_resource follows platform_get_resource directly. The previous version tried to shuffle code if needed, too, what lead to an embarrasing bug. It turned out to me that shuffling code for all cases found will make the automated script too complex, so I am unsure if an automated cleanup is the proper tool for this case. Removing the easy stuff seems worthwhile to me, though. Despite various architectures and platform dependencies, I managed to compile test 45 out of 57 modified files locally using heuristics and defconfigs." Pulled because: 296 deletions, 0 additions. * 'devm_no_resource_check' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (33 commits) sound/soc/kirkwood: don't check resource with devm_ioremap_resource sound/soc/fsl: don't check resource with devm_ioremap_resource arch/mips/lantiq/xway: don't check resource with devm_ioremap_resource arch/arm/plat-samsung: don't check resource with devm_ioremap_resource arch/arm/mach-tegra: don't check resource with devm_ioremap_resource drivers/watchdog: don't check resource with devm_ioremap_resource drivers/w1/masters: don't check resource with devm_ioremap_resource drivers/video/omap2/dss: don't check resource with devm_ioremap_resource drivers/video/omap2: don't check resource with devm_ioremap_resource drivers/usb/phy: don't check resource with devm_ioremap_resource drivers/usb/host: don't check resource with devm_ioremap_resource drivers/usb/gadget: don't check resource with devm_ioremap_resource drivers/usb/chipidea: don't check resource with devm_ioremap_resource drivers/thermal: don't check resource with devm_ioremap_resource drivers/staging/nvec: don't check resource with devm_ioremap_resource drivers/staging/dwc2: don't check resource with devm_ioremap_resource drivers/spi: don't check resource with devm_ioremap_resource drivers/rtc: don't check resource with devm_ioremap_resource drivers/pwm: don't check resource with devm_ioremap_resource drivers/pinctrl: don't check resource with devm_ioremap_resource ...
2013-05-18Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds21-199/+149
Pull MIPS fixes from Ralf Baechle: "Patching up across the field. The reversion of the two ASID patches is particularly important as it was breaking many platforms." * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: MIPS: ralink: use the dwc2 driver for the rt305x USB controller MIPS: Extract schedule_mfi info from __schedule MIPS: Fix sibling call handling in get_frame_info MIPS: MSP71xx: remove inline marking of EXPORT_SYMBOL functions MIPS: Make virt_to_phys() work for all unmapped addresses. MIPS: Fix build error for crash_dump.c in 3.10-rc1 MIPS: Xway: Fix clk leak Revert "MIPS: Allow ASID size to be determined at boot time." Revert "MIPS: microMIPS: Support dynamic ASID sizing."
2013-05-18Merge tag 'arm64-fixes' of ↵Linus Torvalds7-19/+9
git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64 Pull arm64 fixes from Catalin Marinas: "Fixes for duplicate definition of early_console, kernel/time/Kconfig include, __flush_dcache_all() set/way computing, debug (locking, bit testing). The of_platform_populate() was moved to an arch_init_call() to allow subsys_init_call() drivers to probe the DT." * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: arm64: debug: fix mdscr.ss check when enabling debug exceptions arm64: Do not source kernel/time/Kconfig explicitly arm64: mm: Fix operands of clz in __flush_dcache_all arm64: Invoke the of_platform_populate() at arch_initcall() level arm64: debug: clear mdscr_el1 instead of taking the OS lock arm64: Fix duplicate definition of early_console
2013-05-18arch/mips/lantiq/xway: don't check resource with devm_ioremap_resourceWolfram Sang1-4/+0
devm_ioremap_resource does sanity checks on the given resource. No need to duplicate this in the driver. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: John Crispin <blogic@openwrt.org>
2013-05-18arch/arm/plat-samsung: don't check resource with devm_ioremap_resourceWolfram Sang1-5/+0
devm_ioremap_resource does sanity checks on the given resource. No need to duplicate this in the driver. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-05-18arch/arm/mach-tegra: don't check resource with devm_ioremap_resourceWolfram Sang1-5/+0
devm_ioremap_resource does sanity checks on the given resource. No need to duplicate this in the driver. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Stephen Warren <swarren@nvidia.com>
2013-05-17MIPS: ralink: use the dwc2 driver for the rt305x USB controllerMatthijs Kooijman2-0/+14
This sets up the devicetree file for the rt3050 chip series and rt3052 eval board to use the right compatible string for the dwc2 driver. Acked-by: John Crispin <blogic@openwrt.org> Cc: blogic@openwrt.org Cc: linux-mips@linux-mips.org Cc: Matthijs Kooijman <matthijs@stdin.nl> Patchwork: https://patchwork.linux-mips.org/patch/5226/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-17MIPS: Extract schedule_mfi info from __scheduleTony Wu1-2/+32
schedule_mfi is supposed to be extracted from schedule(), and is used in thread_saved_pc and get_wchan. But, after optimization, schedule() is reduced to a sibling call to __schedule(), and no real frame info can be extracted. One solution is to compile schedule() with -fno-omit-frame-pointer and -fno-optimize-sibling-calls, but that will incur performance degradation. Another solution is to extract info from the real scheduler, __schedule, and this is the approache adopted here. This patch reads the __schedule address by either following the 'j' call in schedule if KALLSYMS is disabled or by using kallsyms_lookup_name to lookup __schedule if KALLSYMS is available, then, extracts schedule_mfi from __schedule frame info. This patch also fixes the "Can't analyze schedule() prologue" warning at boot time. Signed-off-by: Tony Wu <tung7970@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5237/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-17MIPS: Fix sibling call handling in get_frame_infoTony Wu1-2/+4
Given a function, get_frame_info() analyzes its instructions to figure out frame size and return address. get_frame_info() works as follows: 1. analyze up to 128 instructions if the function size is unknown 2. search for 'addiu/daddiu sp,sp,-immed' for frame size 3. search for 'sw ra,offset(sp)' for return address 4. end search when it sees jr/jal/jalr This leads to an issue when the given function is a sibling call, example shown as follows. 801ca110 <schedule>: 801ca110: 8f820000 lw v0,0(gp) 801ca114: 8c420000 lw v0,0(v0) 801ca118: 080726f0 j 801c9bc0 <__schedule> 801ca11c: 00000000 nop 801ca120 <io_schedule>: 801ca120: 27bdffe8 addiu sp,sp,-24 801ca124: 3c028022 lui v0,0x8022 801ca128: afbf0014 sw ra,20(sp) In this case, get_frame_info() cannot properly detect schedule's frame info, and eventually returns io_schedule's instead. This patch adds 'j' to the end search condition to workaround sibling call cases. Signed-off-by: Tony Wu <tung7970@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5236/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-17MIPS: MSP71xx: remove inline marking of EXPORT_SYMBOL functionsDenis Efremov1-1/+1
EXPORT_SYMBOL and inline directives are contradictory to each other. The patch fixes this inconsistency. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Denis Efremov <yefremov.denis@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: trivial@kernel.org Cc: ldv-project@linuxtesting.org Patchwork: https://patchwork.linux-mips.org/patch/5227/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-17MIPS: Make virt_to_phys() work for all unmapped addresses.David Daney2-2/+2
As reported: This problem was discovered when doing BGP traffic with the TCP MD5 option activated, where the following call chain caused a crash: * tcp_v4_rcv * tcp_v4_timewait_ack * tcp_v4_send_ack -> follow stack variable rep.th * tcp_v4_md5_hash_hdr * tcp_md5_hash_header * sg_init_one * sg_set_buf * virt_to_page I noticed that tcp_v4_send_reset uses a similar stack variable and also calls tcp_v4_md5_hash_hdr, so it has the same problem. The networking core can indirectly call virt_to_phys() on stack addresses, if this is done from PID 0, the stack will usually be in CKSEG0, so virt_to_phys() needs to work there as well Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Cc: Jiang Liu <liuj97@gmail.com> Cc: eunb.song@samsung.com Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/5220/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-17MIPS: Fix build error for crash_dump.c in 3.10-rc1EunBong Song1-0/+1
This patch fixes crash_dump.c build error. Build error logs are as follow. arch/mips/kernel/crash_dump.c: In function 'kdump_buf_page_init': arch/mips/kernel/crash_dump.c:67: error: implicit declaration of function 'kmalloc' arch/mips/kernel/crash_dump.c:67: error: assignment makes pointer from integer without a cast Signed-off-by: EunBong Song <eunb.song@samsung.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/5238/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-17MIPS: Xway: Fix clk leakLibo Chen1-0/+2
When gptu_r32 fails, we should put clk before returning. Signed-off-by: Libo Chen <libo.chen@huawei.com> Acked-by: John Crispin <blogic@openwrt.org> Cc: grant.likely@linaro.org Cc: rob.herring@calxeda.com, Cc: linux-mips@linux-mips.org Cc: LKML linux-kernel@vger.kernel.org Cc: Andrew Morton akpm@linux-foundation.org Cc: Li Zefan lizefan@huawei.com Patchwork: https://patchwork.linux-mips.org/patch/5247/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-17arm64: debug: fix mdscr.ss check when enabling debug exceptionsWill Deacon1-1/+1
When we take an exception at EL1, we only want to enable debug exceptions if we're not currently stepping, otherwise we can easily get stuck in a loop stepping into interrupt handlers. Unfortunately, the current code tests the wrong bit in the mdscr, so fix that. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-05-16Revert "MIPS: Allow ASID size to be determined at boot time."David Daney13-162/+93
This reverts commit d532f3d26716a39dfd4b88d687bd344fbe77e390. The original commit has several problems: 1) Doesn't work with 64-bit kernels. 2) Calls TLBMISS_HANDLER_SETUP() before the code is generated. 3) Calls TLBMISS_HANDLER_SETUP() twice in per_cpu_trap_init() when only one call is needed. [ralf@linux-mips.org: Also revert the bits of the ASID patch which were hidden in the KVM merge.] Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: "Steven J. Hill" <Steven.Hill@imgtec.com> Cc: David Daney <david.daney@cavium.com> Patchwork: https://patchwork.linux-mips.org/patch/5242/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-16Revert "MIPS: microMIPS: Support dynamic ASID sizing."David Daney1-32/+2
This reverts commit f6b06d9361a008afb93b97fb3683a6e92d69d0f4. The next revert depends on this one, so this has to go too. Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: "Steven J. Hill" <Steven.Hill@imgtec.com> Cc: David Daney <david.daney@cavium.com> Patchwork: https://patchwork.linux-mips.org/patch/5241/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-05-15Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds3-6/+23
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fixes from Thomas Gleixner: - Fix for a CPU hot-add deadlock in microcode update code - Fix for idle consolidation fallout - Documentation update for initial kernel direct mapping * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Add missing comments for initial kernel direct mapping x86/microcode: Add local mutex to fix physical CPU hot-add deadlock x86: Fix idle consolidation fallout
2013-05-15Merge branch 'timers-urgent-for-linus' of ↵Linus Torvalds1-1/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timer fixes from Thomas Gleixner: - Cure for not using zalloc in the first place, which leads to random crashes with CPUMASK_OFF_STACK. - Revert a user space visible change which broke udev - Add a missing cpu_online early return introduced by the new full dyntick conversions - Plug a long standing race in the timer wheel cpu hotplug code. Sigh... - Cleanup NOHZ per cpu data on cpu down to prevent stale data on cpu up. * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons timer: Don't reinitialize the cpu base lock during CPU_UP_PREPARE tick: Don't invoke tick_nohz_stop_sched_tick() if the cpu is offline tick: Cleanup NOHZ per cpu data on cpu down tick: Use zalloc_cpumask_var for allocating offstack cpumasks
2013-05-15Merge branch 'core-urgent-for-linus' of ↵Linus Torvalds1-0/+3
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull core fixes from Thomas Gleixner: - Two fixlets for the fallout of the generic idle task conversion - Documentation update * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: rcu/idle: Wrap cpu-idle poll mode within rcu_idle_enter/exit idle: Fix hlt/nohlt command-line handling in new generic idle kthread: Document ways of reducing OS jitter due to per-CPU kthreads
2013-05-15Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds4-9/+7
Pull ARM fixes from Russell King: "A small number of fixes for stuff from the last merge window, and in one case (IRQ time accounting) the previous merge window." * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: 7720/1: ARM v6/v7 cmpxchg64 shouldn't clear upper 32 bits of the old/new value ARM: 7715/1: MCPM: adapt to GIC changes after upstream merge ARM: 7714/1: mmc: mmci: Ensure return value of regulator_enable() is checked ARM: 7712/1: Remove trailing whitespace in arch/arm/Makefile ARM: 7711/1: dove: fix Dove cpu type from V7 to PJ4 ARM: finally enable IRQ time accounting config
2013-05-14time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitonsJohn Stultz1-1/+0
Kay Sievers noted that the ALWAYS_USE_PERSISTENT_CLOCK config, which enables some minor compile time optimization to avoid uncessary code in mostly the suspend/resume path could cause problems for userland. In particular, the dependency for RTC_HCTOSYS on !ALWAYS_USE_PERSISTENT_CLOCK, which avoids setting the time twice and simplifies suspend/resume, has the side effect of causing the /sys/class/rtc/rtcN/hctosys flag to always be zero, and this flag is commonly used by udev to setup the /dev/rtc symlink to /dev/rtcN, which can cause pain for older applications. While the udev rules could use some work to be less fragile, breaking userland should strongly be avoided. Additionally the compile time optimizations are fairly minor, and the code being optimized is likely to be reworked in the future, so lets revert this change. Reported-by: Kay Sievers <kay@vrfy.org> Signed-off-by: John Stultz <john.stultz@linaro.org> Cc: stable <stable@vger.kernel.org> #3.9 Cc: Feng Tang <feng.tang@intel.com> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Link: http://lkml.kernel.org/r/1366828376-18124-1-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-14arm64: Do not source kernel/time/Kconfig explicitlyCatalin Marinas1-2/+0
As per commit 764e0da1 (timers: Fixup the Kconfig consolidation fallout), init/Kconfig already includes kernel/time/Kconfig, so no need to do it explicitly for arm64. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-05-14arm64: mm: Fix operands of clz in __flush_dcache_allSukanto Ghosh1-1/+1
The format of the lower 32-bits of the 64-bit operand to 'dc cisw' is unchanged from ARMv7 architecture and the upper bits are RES0. This implies that the 'way' field of the operand of 'dc cisw' occupies the bit-positions [31 .. (32-A)]. Due to the use of 64-bit extended operands to 'clz', the existing implementation of __flush_dcache_all is incorrectly placing the 'way' field in the bit-positions [63 .. (64-A)]. Signed-off-by: Sukanto Ghosh <sghosh@apm.com> Tested-by: Anup Patel <anup.patel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: stable@vger.kernel.org
2013-05-14arm64: Invoke the of_platform_populate() at arch_initcall() levelCatalin Marinas1-9/+3
The of_platform_populate() is currently invoked at device_initcall() level. There are however drivers that use platform_driver_probe() directly and they need the devices to be populated. This patch makes the of_platform_populate() and arch_initcall(). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Benoit Lecardonnel <Benoit.Lecardonnel@synopsys.com> Tested-by: Benoit Lecardonnel <Benoit.Lecardonnel@synopsys.com>
2013-05-14Merge branch 'merge' of ↵Linus Torvalds45-206/+763
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc Pull powerpc fixes from Benjamin Herrenschmidt: "This is mostly bug fixes (some of them regressions, some of them I deemed worth merging now) along with some patches from Li Zhong hooking up the new context tracking stuff (for the new full NO_HZ)" * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (25 commits) powerpc: Set show_unhandled_signals to 1 by default powerpc/perf: Fix setting of "to" addresses for BHRB powerpc/pmu: Fix order of interpreting BHRB target entries powerpc/perf: Move BHRB code into CONFIG_PPC64 region powerpc: select HAVE_CONTEXT_TRACKING for pSeries powerpc: Use the new schedule_user API on userspace preemption powerpc: Exit user context on notify resume powerpc: Exception hooks for context tracking subsystem powerpc: Syscall hooks for context tracking subsystem powerpc/booke64: Fix kernel hangs at kernel_dbg_exc powerpc: Fix irq_set_affinity() return values powerpc: Provide __bswapdi2 powerpc/powernv: Fix starting of secondary CPUs on OPALv2 and v3 powerpc/powernv: Detect OPAL v3 API version powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning again powerpc: Make CONFIG_RTAS_PROC depend on CONFIG_PROC_FS powerpc: Bring all threads online prior to migration/hibernation powerpc/rtas_flash: Fix validate_flash buffer overflow issue powerpc/kexec: Fix kexec when using VMX optimised memcpy powerpc: Fix build errors STRICT_MM_TYPECHECKS ...
2013-05-14powerpc: Set show_unhandled_signals to 1 by defaultBenjamin Herrenschmidt1-1/+1
Just like other architectures Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/perf: Fix setting of "to" addresses for BHRBMichael Neuling1-1/+30
Currently we only set the "to" address in the branch stack when the CPU explicitly gives us a value. Unfortunately it only does this for XL form branches (eg blr, bctr, bctar) and not I and B form branches (eg b, bc). Fortunately if we read the instruction from memory we can extract the offset of a branch and calculate the target address. This adds a function power_pmu_bhrb_to() to calculate the target/to address of the corresponding I and B form branches. It handles branches in both user and kernel spaces. It also plumbs this into the perf brhb reading code. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/pmu: Fix order of interpreting BHRB target entriesMichael Neuling1-43/+46
The current Branch History Rolling Buffer (BHRB) code misinterprets the order of entries in the hardware buffer. It assumes that a branch target address will be read _after_ its corresponding branch. In reality the branch target comes before (lower mfbhrb entry) it's corresponding branch. This is a rewrite of the code to take this into account. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/perf: Move BHRB code into CONFIG_PPC64 regionMichael Neuling1-121/+127
The new Branch History Rolling buffer (BHRB) code is only useful on 64bit processors, so move it into the #ifdef CONFIG_PPC64 region. This avoids code bloat on 32bit systems. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: select HAVE_CONTEXT_TRACKING for pSeriesLi Zhong1-0/+1
Start context tracking support from pSeries. Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Use the new schedule_user API on userspace preemptionLi Zhong2-1/+12
This patch corresponds to [PATCH] x86: Use the new schedule_user API on userspace preemption commit 0430499ce9d78691f3985962021b16bf8f8a8048 Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Exit user context on notify resumeLi Zhong1-0/+5
This patch allows RCU usage in do_notify_resume, e.g. signal handling. It corresponds to [PATCH] x86: Exit RCU extended QS on notify resume commit edf55fda35c7dc7f2d9241c3abaddaf759b457c6 Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Exception hooks for context tracking subsystemLi Zhong3-45/+112
This is the exception hooks for context tracking subsystem, including data access, program check, single step, instruction breakpoint, machine check, alignment, fp unavailable, altivec assist, unknown exception, whose handlers might use RCU. This patch corresponds to [PATCH] x86: Exception hooks for userspace RCU extended QS commit 6ba3c97a38803883c2eee489505796cb0a727122 But after the exception handling moved to generic code, and some changes in following two commits: 56dd9470d7c8734f055da2a6bac553caf4a468eb context_tracking: Move exception handling to generic code 6c1e0256fad84a843d915414e4b5973b7443d48d context_tracking: Restore correct previous context state on exception exit it is able for exception hooks to use the generic code above instead of a redundant arch implementation. Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Syscall hooks for context tracking subsystemLi Zhong2-2/+10
This is the syscall slow path hooks for context tracking subsystem, corresponding to [PATCH] x86: Syscall hooks for userspace RCU extended QS commit bf5a3c13b939813d28ce26c01425054c740d6731 TIF_MEMDIE is moved to the second 16-bits (with value 17), as it seems there is no asm code using it. TIF_NOHZ is added to _TIF_SYCALL_T_OR_A, so it is better for it to be in the same 16 bits with others in the group, so in the asm code, andi. with this group could work. Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/booke64: Fix kernel hangs at kernel_dbg_excScott Wood2-4/+11
MSR_DE is not cleared on entry to the kernel, and we don't clear it explicitly outside of debug code. If we have MSR_DE set in prime_debug_regs(), and the new thread has events enabled in DBCR0 (e.g. ICMP is set in thread->dbsr0, even though it was cleared in the real DBCR0 when the thread got scheduled out), we'll end up taking a debug exception in the kernel when DBCR0 is loaded. DSRR0 will not point to an exception vector, and the kernel ends up hanging at kernel_dbg_exc. Fix this by always clearing MSR_DE when we load new debug state. Another observed source of kernel_dbg_exc hangs is with the branch taken event. If this event is active, but we take a non-debug trap (e.g. a TLB miss or an asynchronous interrupt) before the next branch. We end up taking a branch-taken debug exception on the initial branch instruction of the exception vector, but because the debug exception is DBSR_BT rather than DBSR_IC we branch to kernel_dbg_exc before even checking the DSRR0 address. Fix this by checking for DBSR_BT as well as DBSR_IC, which is what 32-bit does and what the comments suggest was intended in the 64-bit code as well. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Fix irq_set_affinity() return valuesAlexander Gordeev4-4/+4
Signed-off-by: Alexander Gordeev <agordeev@redhat.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Provide __bswapdi2David Woodhouse3-1/+24
Some versions of GCC apparently expect this to be provided by libgcc. Updates from Mikey to fix 32 bit version and adding "r" to registers. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/powernv: Fix starting of secondary CPUs on OPALv2 and v3Benjamin Herrenschmidt1-6/+56
The current code fails to handle kexec on OPALv2. This fixes it and adds code to improve the situation on OPALv3 where we can query the CPU status from the firmware and decide what to do based on that. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/powernv: Detect OPAL v3 API versionBenjamin Herrenschmidt4-4/+13
Future firmwares will support that new version Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning againLi Zhong3-4/+1
Saw this warning again, and this time from the ret_from_fork path. It seems we could clear the back chain earlier in copy_thread(), which could cover both path, and also fix potential lockdep usage in schedule_tail(), or exception occurred before we clear the back chain. Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Make CONFIG_RTAS_PROC depend on CONFIG_PROC_FSMichael Ellerman1-1/+1
We are getting build errors with CONFIG_PROC_FS=n: arch/powerpc/kernel/rtas_flash.c In function 'rtas_flash_init': 745:33: error: unused variable 'f' [-Werror=unused-variable] But rtas_flash.c should not be built when CONFIG_PROC_FS=n, beacause all it does is provide a /proc interface to the RTAS flash routines. CONFIG_RTAS_FLASH already depends on CONFIG_RTAS_PROC, to indicate that it depends on the RTAS proc support, but CONFIG_RTAS_PROC does not depend on CONFIG_PROC_FS. So fix that. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Bring all threads online prior to migration/hibernationRobert Jennings3-0/+137
This patch brings online all threads which are present but not online prior to migration/hibernation. After migration/hibernation those threads are taken back offline. During migration/hibernation all online CPUs must call H_JOIN, this is required by the hypervisor. Without this patch, threads that are offline (H_CEDE'd) will not be woken to make the H_JOIN call and the OS will be deadlocked (all threads either JOIN'd or CEDE'd). Cc: <stable@kernel.org> Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/rtas_flash: Fix validate_flash buffer overflow issueVasant Hegde1-4/+6
ibm,validate-flash-image RTAS call output buffer contains 150 - 200 bytes of data on latest system. Presently we have output buffer size as 64 bytes and we use sprintf to copy data from RTAS buffer to local buffer. This causes kernel oops (see below call trace). This patch increases local buffer size to 256 and also uses snprintf instead of sprintf to copy data from RTAS buffer. Kernel call trace : ------------------- Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=1024 NUMA pSeries Modules linked in: nfs fscache lockd auth_rpcgss nfs_acl sunrpc fuse loop dm_mod ipv6 ipv6_lib usb_storage ehea(X) sr_mod qlge ses cdrom enclosure st be2net sg ext3 jbd mbcache usbhid hid ohci_hcd ehci_hcd usbcore qla2xxx usb_common sd_mod crc_t10dif scsi_dh_hp_sw scsi_dh_rdac scsi_dh_alua scsi_dh_emc scsi_dh lpfc scsi_transport_fc scsi_tgt ipr(X) libata scsi_mod Supported: Yes NIP: 4520323031333130 LR: 4520323031333130 CTR: 0000000000000000 REGS: c0000001b91779b0 TRAP: 0400 Tainted: G X (3.0.13-0.27-ppc64) MSR: 8000000040009032 <EE,ME,IR,DR> CR: 44022488 XER: 20000018 TASK = c0000001bca1aba0[4736] 'cat' THREAD: c0000001b9174000 CPU: 36 GPR00: 4520323031333130 c0000001b9177c30 c000000000f87c98 000000000000009b GPR04: c0000001b9177c4a 000000000000000b 3520323031333130 2032303133313031 GPR08: 3133313031350a4d 000000000000009b 0000000000000000 c0000000003664a4 GPR12: 0000000022022448 c000000003ee6c00 0000000000000002 00000000100e8a90 GPR16: 00000000100cb9d8 0000000010093370 000000001001d310 0000000000000000 GPR20: 0000000000008000 00000000100fae60 000000000000005e 0000000000000000 GPR24: 0000000010129350 46573738302e3030 2046573738302e30 300a4d4720323031 GPR28: 333130313520554e 4b4e4f574e0a4d47 2032303133313031 3520323031333130 NIP [4520323031333130] 0x4520323031333130 LR [4520323031333130] 0x4520323031333130 Call Trace: [c0000001b9177c30] [4520323031333130] 0x4520323031333130 (unreliable) Instruction dump: XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/kexec: Fix kexec when using VMX optimised memcpyAnton Blanchard1-0/+4
commit b3f271e86e5a (powerpc: POWER7 optimised memcpy using VMX and enhanced prefetch) uses VMX when it is safe to do so (ie not in interrupt). It also looks at the task struct to decide if we have to save the current tasks' VMX state. kexec calls memcpy() at a point where the task struct may have been overwritten by the new kexec segments. If it has been overwritten then when memcpy -> enable_altivec looks up current->thread.regs->msr we get a cryptic oops or lockup. I also notice we aren't initialising thread_info->cpu, which means smp_processor_id is broken. Fix that too. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: <stable@vger.kernel.org> # 3.6+ Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc: Fix build errors STRICT_MM_TYPECHECKSAneesh Kumar K.V3-5/+5
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14powerpc/mm: Use the correct mask value when looking at pgtable addressAneesh Kumar K.V1-1/+1
Our pgtable are 2*sizeof(pte_t)*PTRS_PER_PTE which is PTE_FRAG_SIZE. Instead of depending on frag size, mask with PMD_MASKED_BITS. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-13Merge tag 'fixes-for-3.10-rc2-tag' of ↵Linus Torvalds1-19/+14
git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen Pull Xen/arm fixes from Stefano Stabellini: "This contains a couple of Xen on ARM initialization fixes and a patch to improve error handling" * tag 'fixes-for-3.10-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen: xen/arm: rename xen_secondary_init and run it on every online cpu xen/arm: do not handle VCPUOP_register_vcpu_info failures xen/arm: initialize pm functions later
2013-05-13Merge branch 'parisc-for-3.10' of ↵Linus Torvalds7-101/+194
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc update from Helge Deller: "The second round of parisc updates for 3.10 includes build fixes and enhancements to utilize irq stacks, fixes SMP races when updating PTE and TLB entries by proper locking and makes the search for the correct cross compiler more robust on Debian and Gentoo." * 'parisc-for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: make default cross compiler search more robust (v3) parisc: fix SMP races when updating PTE and TLB entries in entry.S parisc: implement irq stacks - part 2 (v2)
2013-05-13ARM: 7720/1: ARM v6/v7 cmpxchg64 shouldn't clear upper 32 bits of the ↵Jaccon Bastiaansen1-4/+4
old/new value The implementation of cmpxchg64() for the ARM v6 and v7 architecture casts parameter 2 and 3 (the old and new 64bit values) to an unsigned long before calling the atomic_cmpxchg64() function. This clears the top 32 bits of the old and new values, resulting in the wrong values being compare-exchanged. Luckily, this only appears to be used for 64-bit sched_clock, which we don't (yet) have on ARM. This bug was introduced by commit 3e0f5a15f500 ("ARM: 7404/1: cmpxchg64: use atomic64 and local64 routines for cmpxchg64"). Cc: <stable@vger.kernel.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jaccon Bastiaansen <jaccon.bastiaansen@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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