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* Revert "ext4: don't release page refs in ext4_end_bio()"Linus Torvalds2012-03-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit b43d17f319f2c502b17139d1cf70731b2b62c644. Dave Jones reports that it causes lockups on his laptop, and his debug output showed a lot of processes hung waiting for page_writeback (or more commonly - processes hung waiting for a lock that was held during that writeback wait). The page_writeback hint made Ted suggest that Dave look at this commit, and Dave verified that reverting it makes his problems go away. Ted says: "That commit fixes a race which is seen when you write into fallocated (and hence uninitialized) disk blocks under *very* heavy memory pressure. Furthermore, although theoretically it could trigger under normal direct I/O writes, it only seems to trigger if you are issuing a huge number of AIO writes, such that a just-written page can get evicted from memory, and then read back into memory, before the workqueue has a chance to update the extent tree. This race has been around for a little over a year, and no one noticed until two months ago; it only happens under fairly exotic conditions, and in fact even after trying very hard to create a simple repro under lab conditions, we could only reproduce the problem and confirm the fix on production servers running MySQL on very fast PCIe-attached flash devices. Given that Dave was able to hit this problem pretty quickly, if we confirm that this commit is at fault, the only reasonable thing to do is to revert it IMO." Reported-and-tested-by: Dave Jones <davej@redhat.com> Acked-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds2012-03-29
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull more ARM updates from Russell King. This got a fair number of conflicts with the <asm/system.h> split, but also with some other sparse-irq and header file include cleanups. They all looked pretty trivial, though. * 'for-linus' of git://git.linaro.org/people/rmk/linux-arm: (59 commits) ARM: fix Kconfig warning for HAVE_BPF_JIT ARM: 7361/1: provide XIP_VIRT_ADDR for no-MMU builds ARM: 7349/1: integrator: convert to sparse irqs ARM: 7259/3: net: JIT compiler for packet filters ARM: 7334/1: add jump label support ARM: 7333/2: jump label: detect %c support for ARM ARM: 7338/1: add support for early console output via semihosting ARM: use set_current_blocked() and block_sigmask() ARM: exec: remove redundant set_fs(USER_DS) ARM: 7332/1: extract out code patch function from kprobes ARM: 7331/1: extract out insn generation code from ftrace ARM: 7330/1: ftrace: use canonical Thumb-2 wide instruction format ARM: 7351/1: ftrace: remove useless memory checks ARM: 7316/1: kexec: EOI active and mask all interrupts in kexec crash path ARM: Versatile Express: add NO_IOPORT ARM: get rid of asm/irq.h in asm/prom.h ARM: 7319/1: Print debug info for SIGBUS in user faults ARM: 7318/1: gic: refactor irq_start assignment ARM: 7317/1: irq: avoid NULL check in for_each_irq_desc loop ARM: 7315/1: perf: add support for the Cortex-A7 PMU ...
| * Merge branch 'devel-stable' into for-linusRussell King2012-03-27
| |\ | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/arm/Kconfig.debug arch/arm/plat-versatile/Kconfig Merge fixes: arch/arm/mach-integrator/Kconfig drivers/clocksource/Kconfig
| | * Merge branch 'sched_clock-for-rmk' of ↵Russell King2012-03-08
| | |\ | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into devel-stable
| | | * msm: timer: Support sched_clock()Stephen Boyd2012-02-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that sched_clock is mandatory on ARM it's simple to add sched_clock support to the MSM timer code. Add it so that we get more accurate sched_clock output than the jiffies based version that's provided by default. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: David Brown <davidb@codeaurora.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| | * | ARM: 7344/1: pxa: mainstone: add missing include for IRQ_BOARD_STARTRob Herring2012-02-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As part of mach/irqs.h include removal from sparse, mainstone.h was missed. This fixes the compile of the pcmcia driver. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | * | Merge branch 'sched_clock-for-rmk' of ↵Russell King2012-02-04
| | |\| | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into devel-stable
| | | * ARM: Make the sched_clock framework mandatoryMarc Zyngier2012-02-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All sched_clock() providers have been converted to the sched_clock framework, which also provides a jiffy based implementation for the platforms that do not provide a counter. It is now possible to make the sched_clock framework mandatory, effectively preventing new platforms to add new sched_clock() functions, which would be detrimental to the single zImage work. Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| | | * ARM: prima2: convert to common sched_clock() implementationMarc Zyngier2012-02-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Prima2 has its own sched_clock() implementation, which gets in the way of a single zImage. Moving to the common sched_clock framework makes the code slightly cleaner (the mapping hack in sched_clock() goes away...). Acked-by: Barry Song <baohua.song@csr.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| | | * ARM: davinci: convert to common sched_clock() implementationMarc Zyngier2012-02-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Davinci has its own sched_clock() implementation, which gets in the way of a single zImage. Moving to the common sched_clock framework makes the code slightly cleaner. Acked-by: Sekhar Nori <nsekhar@ti.com> Cc: Kevin Hilman <khilman@ti.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| | | * ARM: davinci: time.c: group related header files togetherSekhar Nori2012-02-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rearrange header files to keep related header files together. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| | * | Merge branch 'sparse_irq' of git://sources.calxeda.com/kernel/linux into ↵Russell King2012-02-04
| | |\ \ | | | |/ | | |/| | | | | devel-stable
| | | * ARM: picoxcell: remove mach/irqs.hJamie Iles2012-01-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | picoxcell uses SPARSE_IRQ which means we don't need a mach/irqs.h anymore so kill it off. Signed-off-by: Jamie Iles <jamie@jamieiles.com> Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: highbank: select SPARSE_IRQ and remove irqs.hRob Herring2012-01-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | irqs.h is optional now for SPARSE_IRQ, so select it and remove mach/irqs.h from highbank. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: only include mach/irqs.h for !SPARSE_IRQRob Herring2012-01-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make mach/irqs.h optional for SPARSE_IRQ. With this change mach/irqs.h can be removed by converting platforms over to sparse irq. Platforms either need to set nr_irqs in their machine desc or all irqchips used by a platform need to allocate their irq_descs. There cannot be a mixture. Once this is done, the platforms can select SPARSE_IRQ. shmobile does the latter, and mmp and pxa do the former. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: shmobile: remove NR_IRQSRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove NR_IRQS and explicitly include mach/irqs.h as needed. shmobile properly allocates irq_descs for each irqchip, so setting .nr_irqs for each machine is not needed. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: pxa: remove NR_IRQSRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | Remove NR_IRQS and add a per machine .nr_irqs setting. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: mmp: remove NR_IRQSRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove NR_IRQS and add a per machine .nr_irqs setting. Clean-up namespace replacing usage of IRQ_BOARD_START with MMP_NR_IRQS. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * sh: intc: remove dependency on NR_IRQSRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SH intc has a compile time dependency on NR_IRQS. Make this dependency a local define so that shmobile (and ARM in general) can have run-time NR_IRQS setting. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * sh: intc: unify evt2irq/irq2evt macros for sh and armRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Move evt2irq and irq2evt macros definitions out of sh and arm includes into a common location. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: it8152: explicitly include mach/irqs.hRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | In preparation to make mach/irqs.h optional, directly include mach/irq.h to get IRQ_BOARD_START. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: mc146818rtc: remove unnecessary include of mach/irqs.hRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The include of mach/irqs.h isn't needed, so remove it. Compiled CMOS rtc driver. Add a check to make sure nothing depends on RTC_IRQ. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * ARM: remove mc146818rtc.h from time.cRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | mc146818rtc.h is not needed in time.c, so remove it. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * gpio: pxa: explicitly include mach/irqs.hRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | In preparation to make mach/irqs.h optional and remove from asm/irq.h, directly include mach/irq.h to get MMP_GPIO_TO_IRQ and PXA_GPIO_TO_IRQ. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * sound: pxa2xx-ac97: include mach/irqs.h directlyRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | In preparation of removing mach/irqs.h include from asm/irq.h, include mach/irqs.h directly. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
| | | * irq: make SPARSE_IRQ an optionally hidden optionRob Herring2012-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On ARM, we don't want SPARSE_IRQ to be a user visible option. Make SPARSE_IRQ visible based on MAY_HAVE_SPARSE_IRQ instead of depending on HAVE_SPARSE_IRQ. With this, SPARSE_IRQ is not visible on C6X and ARM. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: linux-c6x-dev@linux-c6x.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-sh@vger.kernel.org
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| *-. \ \ Merge branches 'l2', 'pgt2' and 'misc' into for-linusRussell King2012-03-27
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| | | * | | ARM: fix Kconfig warning for HAVE_BPF_JITRussell King2012-03-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Last night's randconfig and the allnoconfig builds spat out the following warning while building: warning: (ARM) selects HAVE_BPF_JIT which has unmet direct dependencies (NET) Acked-by: Mircea Gherzan <mgherzan@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7361/1: provide XIP_VIRT_ADDR for no-MMU buildsUwe Kleine-König2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | XIP_VIRT_ADDR is needed for XIP builds and currently only defined for builds with CONFIG_MMU. Also provide it for no-MMU builds to make it possible to build an XIP kernel for MMU-less machines. As these lack an MMU it has to be an identity mapping. Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7349/1: integrator: convert to sparse irqsLinus Walleij2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This converts the Integrator AP/CP to use sparse IRQs. Tested on both machines. Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7259/3: net: JIT compiler for packet filtersMircea Gherzan2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Based of Matt Evans's PPC64 implementation. The compiler generates ARM instructions but interworking is supported for Thumb2 kernels. Supports both little and big endian. Unaligned loads are emitted for ARMv6+. Not all the BPF opcodes that deal with ancillary data are supported. The scratch memory of the filter lives on the stack. Hardware integer division is used if it is available. Enabled in the same way as for x86-64 and PPC64: echo 1 > /proc/sys/net/core/bpf_jit_enable A value greater than 1 enables opcode output. Signed-off-by: Mircea Gherzan <mgherzan@gmail.com> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7334/1: add jump label supportRabin Vincent2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the arch-specific code to support jump labels for ARM and Thumb-2. This code will only be activated on compilers that are capable of building it. It has been tested with GCC 4.6 patched with the patch from GCC bug 48637. Cc: Jason Baron <jbaron@redhat.com> Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7333/2: jump label: detect %c support for ARMRabin Vincent2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some versions of ARM GCC which do support asm goto, do not support the %c specifier. Since we need the %c to support jump labels on ARM, detect that too in the asm goto detection script to avoid build errors with these versions. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637 Acked-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7338/1: add support for early console output via semihostingNicolas Pitre2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a very simple method for code running in an emulator, or under the supervision of a debugger, to use I/O facilities on the controlling host. Tested with OpenOCD, and ARM's Fast Models. Details on semihosting can be found in chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: use set_current_blocked() and block_sigmask()Matt Fleming2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As described in e6fa16ab ("signal: sigprocmask() should do retarget_shared_pending()") the modification of current->blocked is incorrect as we need to check for shared signals we're about to block. Also, use the new helper function introduced in commit 5e6292c0f28f ("signal: add block_sigmask() for adding sigmask to current->blocked") which centralises the code for updating current->blocked after successfully delivering a signal and reduces the amount of duplicate code across architectures. In the past some architectures got this code wrong, so using this helper function should stop that from happening again. Cc: Arnd Bergmann <arnd.bergmann@linaro.org> Cc: Dave Martin <dave.martin@linaro.org> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Will Deacon <will.deacon@arm.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: exec: remove redundant set_fs(USER_DS)Mathias Krause2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The address limit is already set in flush_old_exec() so this set_fs(USER_DS) is redundant. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7332/1: extract out code patch function from kprobesRabin Vincent2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extract out the code patching code from kprobes so that it can be used from the jump label code. Additionally, the separated code: - Uses the IS_ENABLED() macros instead of the #ifdefs for THUMB2 support - Unifies the two separate functions in kprobes, providing one function that uses stop_machine() internally, and one that can be called from stop_machine() directly - Patches the text on all CPUs only on processors requiring software broadcasting of cache operations Acked-by: Jon Medhurst <tixy@yxit.co.uk> Tested-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7331/1: extract out insn generation code from ftraceRabin Vincent2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extract out the instruction generation code so that it can be used for jump labels too. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7330/1: ftrace: use canonical Thumb-2 wide instruction formatRabin Vincent2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As commit 592201a9f15 (ARM: Thumb-2: Support Thumb-2 in undefined instruction handler) says: 32-bit Thumb instructions are specified in the form: ((first_half << 16 ) | second_half) which matches the layout used by the ARM ARM. Convert the ftrace code to use the same format to avoid the usage of different formats in kernel code. Acked-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7351/1: ftrace: remove useless memory checksRabin Vincent2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before replacing an instruction, the ftrace code determines what the old instruction should be and verifies that that's what's really there in memory before replacing it. This is useful if for example a bug in mcountrecord causes it to record wrong locations. However, in cases where we replace call sites in entry-common.S, these checks are not needed. For these, we currently just memcpy() the memory content and then "verify" it -- this is quite useless and can be removed. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7316/1: kexec: EOI active and mask all interrupts in kexec crash pathWill Deacon2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The kexec machine crash code can be called in interrupt context via a sysrq trigger made using the magic key combination. If the irq chip dealing with the serial interrupt is using the fasteoi flow handler, then we will never EOI the interrupt because the interrupt handler will be fatal. In the case of a GIC, this results in the crash kernel not receiving interrupts on that CPU interface. This patch adds code (based on the PowerPC implementation) to EOI any pending interrupts on the crash CPU before masking and disabling all interrupts. Secondary cores are not a problem since they are placed into a cpu_relax() loop via an IPI. Reported-by: Lei Wen <leiwen@marvell.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: Versatile Express: add NO_IOPORTRussell King2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Versatile Express, the PCI Express buses are broken and unusable, so we aren't going to support PCI/ISA IO cycles on this platform. Remove the PCI/ISA IO inb et.al. support for this platform. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: get rid of asm/irq.h in asm/prom.hRussell King2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Avoid potential build problems caused by lacking mach/irqs.h includes on non-OF builds caused by an errant include in asm/prom.h. asm/prom.h requires nothing from asm/irq.h, as Grant says: On Mon, Feb 06, 2012 at 05:56:23AM +0000, Grant Likely wrote: > On Sat, Feb 04, 2012 at 10:17:48PM +0000, Russell King wrote: > > Finally, do we need asm/irq.h in our asm/prom.h ? That's causing > > fragility between DT and non-DT builds, because people are finding > > that their DT builds work without their mach/irqs.h includes but > > fail when built with non-DT. The only thing which DT might need - > > at the most - is NR_IRQS, but I'd hope with things like irq domains > > it doesn't actually require it. > > I don't think so. There may be a file or two that break because they're > not including everything they need, but I don't think anything in the > header requires it. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7319/1: Print debug info for SIGBUS in user faultsJavi Merino2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Print debug information on user faults for SIGBUS if user_debug = 16 in the kernel command line. Reference: <1327333344-26340-1-git-send-email-javi.merino@arm.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7318/1: gic: refactor irq_start assignmentWill Deacon2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The irq_start and hwirq_base assignment code is fairly hairy and ended up being difficult to read following a conflict resolution for 3.2. This patch rearranges the code slightly to make it easier to read. Cc: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7317/1: irq: avoid NULL check in for_each_irq_desc loopWill Deacon2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ARM unconditionally selects CONFIG_GENERIC_HARDIRQS, so the definition of for_each_irq_desc will check that the desc is non-NULL anyway. This patch removes a redundant check from the IRQ migration code. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: 7315/1: perf: add support for the Cortex-A7 PMUWill Deacon2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cortex-A7 implements an ARMv7-compatible PMU compliant with the PMUv2 architecture specification. This patch adds support for the PMU to the ARM perf backend. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: sync sched_clock() state on suspendRussell King2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Ensure that the software state for sched_clock() is updated at the point of suspend so that we avoid losing ticks since the last update. This prevents the platform dependent possibility that sched_clock() may appear to go backwards across a suspend/resume cycle. Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: Add compiled ISA to oops dumpsRussell King2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the compiled ISA to oops dumps, along side the preempt/smp configuration. This allows us to see immediately whether the kernel was compiled for Thumb-2 or not. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * | | ARM: Optimize multi-CPU tlb flushing a little moreRussell King2012-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The compiler does not conditionalize the assembly instructions for the tlb operations, which leads to sub-optimal code being generated when building a kernel for multiple CPUs. We can tweak things fairly simply as the code fragment below shows: 17f8: e3120001 tst r2, #1 ; 0x1 ... 1800: 0a000000 beq 1808 <handle_pte_fault+0x194> 1804: ee061f10 mcr 15, 0, r1, cr6, cr0, {0} 1808: e3120004 tst r2, #4 ; 0x4 180c: 0a000000 beq 1814 <handle_pte_fault+0x1a0> 1810: ee081f36 mcr 15, 0, r1, cr8, cr6, {1} becomes: 17f0: e3120001 tst r2, #1 ; 0x1 17f4: 1e063f10 mcrne 15, 0, r3, cr6, cr0, {0} 17f8: e3120004 tst r2, #4 ; 0x4 17fc: 1e083f36 mcrne 15, 0, r3, cr8, cr6, {1} Overall, for Realview with V6 and V7 CPUs configured: text data bss dec hex filename 4153998 207340 5371036 9732374 948116 ../build/realview/vmlinux.before 4153366 207332 5371036 9731734 947e96 ../build/realview/vmlinux.after Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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