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2016-10-12nvme : Add sysfs entry for NVMe CMBs when appropriateStephen Bates1-9/+35
Add a sysfs attribute that contains salient information about the NVMe Controller Memory Buffer when one is present. For now, just display the information about the CMB available from the control registers. We attach the CMB attribute file to the existing nvme_ctrl sysfs group so it can handle the sysfs teardown. Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Jay Freyensee <james_p_freyensee@linux.intel.com> Signed-off-by: Stephen Bates <sbates@raithlin.com> Acked-by Jon Derrick: <jonathan.derrick@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-12nvme: don't schedule multiple resetsKeith Busch1-9/+13
The queue_work only fails if the work is pending, but not yet running. If the work is running, the work item would get requeued, triggering a double reset. If the first reset fails for any reason, the second reset triggers: WARN_ON(dev->ctrl.state == NVME_CTRL_RESETTING) Hitting that schedules controller deletion for a second time, which potentially takes a reference on the device that is being deleted. If the reset occurs at the same time as a hot removal event, this causes a double-free. This patch has the reset helper function check if the work is busy prior to queueing, and changes all places that schedule resets to use this function. Since most users don't want to sync with that work, the "flush_work" is moved to the only caller that wants to sync. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg<sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-12nvme: Delete created IO queues on resetKeith Busch1-4/+5
The driver was decrementing the online_queues prior to attempting to delete those IO queues, so the driver ended up not requesting the controller delete any. This patch saves the online_queues prior to suspending them, and adds that parameter for deleting io queues. Fixes: c21377f8 ("nvme: Suspend all queues before deletion") Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-12nvme: Stop probing a removed deviceKeith Busch1-0/+2
There is no reason the nvme controller can ever return all 1's from reading the CSTS register. This patch returns an error if we observe that status. Without this, we may incorrectly proceed with controller initialization and unnecessarilly rely on error handling to clean this. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-12badblocks: fix overlapping check for clearingTomasz Majchrzak1-2/+4
Current bad block clear implementation assumes the range to clear overlaps with at least one bad block already stored. If given range to clear precedes first bad block in a list, the first entry is incorrectly updated. Check not only if stored block end is past clear block end but also if stored block start is before clear block end. Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com> Acked-by: NeilBrown <neilb@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-09Merge branch 'for-4.9/block-smp' of git://git.kernel.dk/linux-blockLinus Torvalds5-149/+58
Pull blk-mq CPU hotplug update from Jens Axboe: "This is the conversion of blk-mq to the new hotplug state machine" * 'for-4.9/block-smp' of git://git.kernel.dk/linux-block: blk-mq: fixup "Convert to new hotplug state machine" blk-mq: Convert to new hotplug state machine blk-mq/cpu-notif: Convert to new hotplug state machine
2016-10-09Merge branch 'for-4.9/block-irq' of git://git.kernel.dk/linux-blockLinus Torvalds27-191/+159
Pull blk-mq irq/cpu mapping updates from Jens Axboe: "This is the block-irq topic branch for 4.9-rc. It's mostly from Christoph, and it allows drivers to specify their own mappings, and more importantly, to share the blk-mq mappings with the IRQ affinity mappings. It's a good step towards making this work better out of the box" * 'for-4.9/block-irq' of git://git.kernel.dk/linux-block: blk_mq: linux/blk-mq.h does not include all the headers it depends on blk-mq: kill unused blk_mq_create_mq_map() blk-mq: get rid of the cpumask in struct blk_mq_tags nvme: remove the post_scan callout nvme: switch to use pci_alloc_irq_vectors blk-mq: provide a default queue mapping for PCI device blk-mq: allow the driver to pass in a queue mapping blk-mq: remove ->map_queue blk-mq: only allocate a single mq_map per tag_set blk-mq: don't redistribute hardware queues on a CPU hotplug event
2016-10-09Merge tag 'dm-4.9-changes' of ↵Linus Torvalds16-265/+716
git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm Pull device mapper updates from Mike Snitzer: - various fixes and cleanups for request-based DM core - add support for delaying the requeue of requests; used by DM multipath when all paths have failed and 'queue_if_no_path' is enabled - DM cache improvements to speedup the loading metadata and the writing of the hint array - fix potential for a dm-crypt crash on device teardown - remove dm_bufio_cond_resched() and just using cond_resched() - change DM multipath to return a reservation conflict error immediately; rather than failing the path and retrying (potentially indefinitely) * tag 'dm-4.9-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (24 commits) dm mpath: always return reservation conflict without failing over dm bufio: remove dm_bufio_cond_resched() dm crypt: fix crash on exit dm cache metadata: switch to using the new cursor api for loading metadata dm array: introduce cursor api dm btree: introduce cursor api dm cache policy smq: distribute entries to random levels when switching to smq dm cache: speed up writing of the hint array dm array: add dm_array_new() dm mpath: delay the requeue of blk-mq requests while all paths down dm mpath: use dm_mq_kick_requeue_list() dm rq: introduce dm_mq_kick_requeue_list() dm rq: reduce arguments passed to map_request() and dm_requeue_original_request() dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests dm: convert wait loops to use autoremove_wake_function() dm: use signal_pending_state() in dm_wait_for_completion() dm: rename task state function arguments dm: add two lockdep_assert_held() statements dm rq: simplify dm_old_stop_queue() dm mpath: check if path's request_queue is dying in activate_path() ...
2016-10-09Merge tag 'for-linus' of ↵Linus Torvalds114-483/+12089
git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma Pull main rdma updates from Doug Ledford: "This is the main pull request for the rdma stack this release. The code has been through 0day and I had it tagged for linux-next testing for a couple days. Summary: - updates to mlx5 - updates to mlx4 (two conflicts, both minor and easily resolved) - updates to iw_cxgb4 (one conflict, not so obvious to resolve, proper resolution is to keep the code in cxgb4_main.c as it is in Linus' tree as attach_uld was refactored and moved into cxgb4_uld.c) - improvements to uAPI (moved vendor specific API elements to uAPI area) - add hns-roce driver and hns and hns-roce ACPI reset support - conversion of all rdma code away from deprecated create_singlethread_workqueue - security improvement: remove unsafe ib_get_dma_mr (breaks lustre in staging)" * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma: (75 commits) staging/lustre: Disable InfiniBand support iw_cxgb4: add fast-path for small REG_MR operations cxgb4: advertise support for FR_NSMR_TPTE_WR IB/core: correctly handle rdma_rw_init_mrs() failure IB/srp: Fix infinite loop when FMR sg[0].offset != 0 IB/srp: Remove an unused argument IB/core: Improve ib_map_mr_sg() documentation IB/mlx4: Fix possible vl/sl field mismatch in LRH header in QP1 packets IB/mthca: Move user vendor structures IB/nes: Move user vendor structures IB/ocrdma: Move user vendor structures IB/mlx4: Move user vendor structures IB/cxgb4: Move user vendor structures IB/cxgb3: Move user vendor structures IB/mlx5: Move and decouple user vendor structures IB/{core,hw}: Add constant for node_desc ipoib: Make ipoib_warn ratelimited IB/mlx4/alias_GUID: Remove deprecated create_singlethread_workqueue IB/ipoib_verbs: Remove deprecated create_singlethread_workqueue IB/ipoib: Remove deprecated create_singlethread_workqueue ...
2016-10-09Merge tag 'for-linus-2' of ↵Linus Torvalds18-124/+210
git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma Pull more rdma updates from Doug Ledford: "Minor updates for rxe driver" [ Starting to do merge window pulls again - the current -git tree does appear to have some netfilter use-after-free issues, but I've sent off the report to the proper channels, and I don't want to delay merge window activity any more ] * tag 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma: IB/rxe: improved debug prints & code cleanup rdma_rxe: Ensure rdma_rxe init occurs at correct time IB/rxe: Properly honor max IRD value for rd/atomic. IB/{rxe,core,rdmavt}: Fix kernel crash for reg MR IB/rxe: Fix sending out loopback packet on netdev interface. IB/rxe: Avoid scheduling tasklet for userspace QP
2016-10-07Merge branch 'akpm' (patches from Andrew)Linus Torvalds195-1698/+2522
Merge updates from Andrew Morton: - fsnotify updates - ocfs2 updates - all of MM * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (127 commits) console: don't prefer first registered if DT specifies stdout-path cred: simpler, 1D supplementary groups CREDITS: update Pavel's information, add GPG key, remove snail mail address mailmap: add Johan Hovold .gitattributes: set git diff driver for C source code files uprobes: remove function declarations from arch/{mips,s390} spelling.txt: "modeled" is spelt correctly nmi_backtrace: generate one-line reports for idle cpus arch/tile: adopt the new nmi_backtrace framework nmi_backtrace: do a local dump_stack() instead of a self-NMI nmi_backtrace: add more trigger_*_cpu_backtrace() methods min/max: remove sparse warnings when they're nested Documentation/filesystems/proc.txt: add more description for maps/smaps mm, proc: fix region lost in /proc/self/smaps proc: fix timerslack_ns CAP_SYS_NICE check when adjusting self proc: add LSM hook checks to /proc/<tid>/timerslack_ns proc: relax /proc/<tid>/timerslack_ns capability requirements meminfo: break apart a very long seq_printf with #ifdefs seq/proc: modify seq_put_decimal_[u]ll to take a const char *, not char proc: faster /proc/*/status ...
2016-10-07Merge tag 'armsoc-late' of ↵Linus Torvalds51-870/+4153
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC late DT updates from Arnd Bergmann: "These updates have been kept in a separate branch mostly because they rely on updates to the respective clk drivers to keep the shared header files in sync. - The Renesas r8a7796 (R-Car M3-W) platform gets added, this is an automotive SoC similar to the ⅹ8a7795 chip we already support, but the dts changes rely on a clock driver change that has been merged for v4.9 through the clk tree. - The Amlogic meson-gxbb (S905) platform gains support for a few drivers merged through our tree, in particular the network and usb driver changes are required and included here, and also the clk tree changes. - The Allwinner platforms have seen a large-scale change to their clk drivers and the dts file updates must come after that. This includes the newly added Nextthing GR8 platform, which is derived from sun5i/A13. - Some integrator (arm32) changes rely on clk driver changes. - A single patch for lpc32xx has no such dependency but wasn't added until just before the merge window" * tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (99 commits) ARM: dts: lpc32xx: add device node for IRAM on-chip memory ARM: dts: sun8i: Add accelerometer to polaroid-mid2407pxe03 ARM: dts: sun8i: enable UART1 for iNet D978 Rev2 board ARM: dts: sun8i: add pinmux for UART1 at PG dts: sun8i-h3: add I2C0-2 peripherals to H3 SOC dts: sun8i-h3: add pinmux definitions for I2C0-2 dts: sun8i-h3: associate exposed UARTs on Orange Pi Boards dts: sun8i-h3: split off RTS/CTS for UART1 in seperate pinmux dts: sun8i-h3: add pinmux definitions for UART2-3 ARM: dts: sun9i: a80-optimus: Disable EHCI1 ARM: dts: sun9i: cubieboard4: Add AXP806 PMIC device node and regulators ARM: dts: sun9i: a80-optimus: Add AXP806 PMIC device node and regulators ARM: dts: sun9i: cubieboard4: Declare AXP809 SW regulator as unused ARM: dts: sun9i: a80-optimus: Declare AXP809 SW regulator as unused ARM: dts: sun8i: Add touchscreen node for sun8i-a33-ga10h ARM: dts: sun8i: Add touchscreen node for sun8i-a23-polaroid-mid2809pxe04 ARM: dts: sun8i: Add touchscreen node for sun8i-a23-polaroid-mid2407pxe03 ARM: dts: sun8i: Add touchscreen node for sun8i-a23-inet86dz ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h ARM64: dts: meson-gxbb-vega-s95: Enable USB Nodes ...
2016-10-07Merge tag 'armsoc-dt64' of ↵Linus Torvalds57-371/+4239
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM 64-bit DT updates from Arnd Bergmann: "The 64-bit DT changes are surprisingly small this time, we only add two SoC platforms: the ZTE ZX296718 Set-top-box SoC and the SocioNext UniPhier LD11 TV SoC, each with their reference boards. There are three new machines added for existing SoC platforms: - The Marvell Armada 8040 development board is an impressive quad-core Cortex-A72 machine with three 10gbit ethernet interfaces - Qualcomms DragonBoard 820c single-board computer is their current high-end phone platform in the 96boards form factor - Rockchip: Tronsmart Orion r86 set-top-box is a popular mid-range Android box based on the 8-core rk3368 SoC" * tag 'armsoc-dt64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (91 commits) arm64: dts: berlin4ct: Add L2 cache topology arm64: dts: berlin4ct: enable all wdt nodes unconditionally arm64: dts: berlin4ct: switch to Cortex-A53 specific pmu nodes arm64: dts: Add ZTE ZX296718 SoC dts and Makefile arm64: dts: apm: Add DT node for APM X-Gene 2 CPU clocks arm64: dts: apm: Add X-Gene SoC hwmon to device tree arm64: dts: apm: Fix interrupt polarity for X-Gene PCIe legacy interrupts arm64: dts: apm: Add APM X-Gene v2 SoC PMU DTS entries arm64: dts: apm: Add APM X-Gene SoC PMU DTS entries arm64: dts: marvell: enable MSI for PCIe on Armada 7K/8K arm64: dts: ls2080a: Add 'dma-coherent' for ls2080a PCI nodes arm64: dts: rockchip: add Type-C phy for RK3399 arm64: dts: rockchip: enable the gmac for rk3399 evb board arm64: dts: rockchip: add the gmac needed node for rk3399 arm64: dts: rockchip: support the pmu node for rk3399 arm64: dts: rockchip: change all interrupts cells to 4 on rk3399 SoCs arm64: dts: rockchip: add the tcpc for rk3399 power domain arm64: dts: rockchip: add efuse0 device node for rk3399 arm64: dts: rockchip: configure PCIe support for rk3399-evb arm64: dts: rockchip: add the PCIe controller support for RK3399 ...
2016-10-07Merge tag 'armsoc-dt' of ↵Linus Torvalds408-5422/+16251
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM DT updates from Arnd Bergmann: "These are as usual a very large number of mostly boring updates to enable devices in existing machines, or to fix minor bugs. Notably, an ongoing treewide effort to fix warnings caused by an update to the device tree compiler. These are enabled with "make W=1" at the moment but can hopefully become the default once all issues have been addressed. No new SoC platform is added this time around (Armada 395 and Orion mv88f5181 are slight variations of existing ones), but a significant number of new dts files are added, which I list by platform: - Allwinner: Empire Electronix M712 and iNet d978 Rev2 tablets, Orange Pi PC Plus, Orange Pi 2, Orange Pi Plus 2E, Orange Pi Lite, Olimex A33-Olinuxino, and Nano Pi Neo single-board computers - ARM Realview: all supported machines (ported from board files) - Broadcom: BCM958525er, BCM958522er, BCM988312hr, BCM958623hr and BCM958622hr reference boards for Northstar platform, Raspberry Pi Zero single-board computer - Marvell EBU: Netgear WNR854T router (ported from board file), Armada 395 SoC platform and GP board Armada 390 DB development board - NXP i.MX: imx7s Warp7 reference board, Gateworks Ventana GW553x single-board computer, Technologic Systems TS-4900 and Engicam IMX6UL GEA M6UL computer-on-module, Inverse Path USB armory board - Qualcomm: LG Nexus 5 Phone - Renesas: r8a7792/wheat and r7s72100/rskrza1 development boards - Rockchip: Rockchip RK3288 Fennec reference board, Firefly RK3288 Reload platform - ST Microelectronics STi: B2260 (96boards) single-board computer - TI Davinci: OMAP-L138 LCDK Development kit - TI OMAP: beagleboard-x15 rev B1 single-board computer" * tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (390 commits) ARM: dts: sony-nsz-gs7: add missing unit name to /memory node ARM: dts: chromecast: add missing unit name to /memory node ARM: dts: berlin2q-marvell-dmp: add missing unit name to /memory node ARM: dts: berlin2: Add missing unit name to /soc node ARM: dts: berlin2cd: Add missing unit name to /soc node ARM: dts: berlin2q: Add missing unit name to /soc node ARM: dts: berlin2: Remove skeleton.dtsi inclusion ARM: dts: berlin2cd: Remove skeleton.dtsi inclusion ARM: dts: berlin2q: Remove skeleton.dtsi inclusion arm: dts: berlin2q: enable all wdt nodes unconditionally arm: dts: berlin2: enable all wdt nodes unconditionally ARM: dts: omap5-igep0050.dts: Use tabs for indentation ARM: dts: Fix igepv5 power button GPIO direction ARM: dts: am335x-evmsk: Add blue-and-red-wiring -property to lcdc node ARM: dts: am335x-evmsk: Whitespace cleanup of lcdc related nodes ARM: dts: am335x-evm: Add blue-and-red-wiring -property to lcdc node ARM: dts: s3c64xx: Use macros for pinctrl configuration ARM: dts: s3c2416: Use macros for pinctrl configuration ARM: dts: s5pv210: Use macros for pinctrl configuration ARM: dts: s3c64xx: Use common macros for pinctrl configuration ...
2016-10-07Merge tag 'armsoc-drivers' of ↵Linus Torvalds52-290/+3789
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC driver updates from Arnd Bergmann: "Driver updates for ARM SoCs, including a couple of newly added drivers: - The Qualcomm external bus interface 2 (EBI2), used in some of their mobile phone chips for connecting flash memory, LCD displays or other peripherals - Secure monitor firmware for Amlogic SoCs, and an NVMEM driver for the EFUSE based on that firmware interface. - Perf support for the AppliedMicro X-Gene performance monitor unit - Reset driver for STMicroelectronics STM32 - Reset driver for SocioNext UniPhier SoCs Aside from these, there are minor updates to SoC-specific bus, clocksource, firmware, pinctrl, reset, rtc and pmic drivers" * tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (50 commits) bus: qcom-ebi2: depend on HAS_IOMEM pinctrl: mvebu: orion5x: Generalise mv88f5181l support for 88f5181 clk: mvebu: Add clk support for the orion5x SoC mv88f5181 dt-bindings: EXYNOS: Add Exynos5433 PMU compatible clocksource: exynos_mct: Add the support for ARM64 perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver Documentation: Add documentation for APM X-Gene SoC PMU DTS binding MAINTAINERS: Add entry for APM X-Gene SoC PMU driver bus: qcom: add EBI2 driver bus: qcom: add EBI2 device tree bindings rtc: rtc-pm8xxx: Add support for pm8018 rtc nvmem: amlogic: Add Amlogic Meson EFUSE driver firmware: Amlogic: Add secure monitor driver soc: qcom: smd: Reset rx tail rather than tx memory: atmel-sdramc: fix a possible NULL dereference reset: hi6220: allow to compile test driver on other architectures reset: zynq: add driver Kconfig option reset: sunxi: add driver Kconfig option reset: stm32: add driver Kconfig option reset: socfpga: add driver Kconfig option ...
2016-10-07Merge tag 'armsoc-arm64' of ↵Linus Torvalds2-2/+48
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC 64-bit updates from Arnd Bergmann: "Changes to platform code for 64-bit ARM platforms. Nearly all of these are defconfig updates to enable new drivers or old drivers still used on these 64-bit platforms. Aside from that, we gain initial support for two set-top-box platforms, both of which already have 32-bit support in arch/arm: - Broadcom adds abstract support for the bcm7xxx/brcmstb platform, presumably the respective dts files and more information will follow at a later point. - The ZTE ZX296718 SoC for set-top-boxes, a relative of the 32-bit ZX296702 SoC that we already support" * tag 'armsoc-arm64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: arm64: add ZTE ZX SoC family arm64: defconfig: enable ZTE ZX related config arm64: defconfig: enable common modules for power management arm64: defconfig: enable meson I2C arm64: defconfig: enable meson SPI as module arm64: defconfig: enable meson WDT as modules arm64: defconfig: enable HW random as module arm64: defconfig: Enable SDHI and GPIO_REGULATOR arm64: configs: enable PCIe driver for Aardvark Kconfig: ARCH_HISI: Add PINCTRL to HISI platform arm64: defconfig: enable bluetooth supports as modules arm64: defconfig: enable CONFIG_INPUT_HISI_POWERKEY for HiKey arm64: defconfig: Enable HiSilicon kirin drm, adv7533 for HiKey arm64: defconfig: Enable Hisi SAS and HNS arm64: defconfig: Enable QDF2432 config options arm64: sunxi: Kconfig: add essential pinctrl driver arm64: defconfig: Add Renesas R-Car HSUSB driver support as module arm64: Add Broadcom Set Top Box Kconfig entry point arm64: defconfig: enable xhci-platform
2016-10-07Merge tag 'armsoc-defconfig' of ↵Linus Torvalds9-64/+63
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC defconfig updates from Arnd Bergmann: "Defconfig additions, removals, etc. Most of these are small changes adding the options for newly upstreamed drivers, or drivers needed for new board support. Nothing specifically sticks out this time" * tag 'armsoc-defconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (25 commits) ARM: multi_v7_defconfig: enable CONFIG_EFI ARM: multi_v7_defconfig: Build Atmel maXTouch driver as a module ARM: defconfig: update the Integrator defconfig ARM: keystone: defconfig: Fix USB configuration ARM: imx_v6_v7_defconfig: Select the wm8960 codec driver ARM: omap2plus_defconfig: switch to the IIO BMP085 driver ARM: mvebu_v5_defconfig: use MV88E6XXX ARM: davinci_all_defconfig: Enable some UBI modules ARM: davinci_all_defconfig: Enable AEMIF as a module ARM: multi_v7_defconfig: Enable SECCOMP ARM: exynos_defconfig: Enable SECCOMP ARM: imx_v6_v7_defconfig: Add CONFIG_MPL3115 ARM: imx_v6_v7_defconfig: Enable GPU support ARM: s3c2410_defconfig: Remove CONFIG_IPV6_PRIVACY ARM: exynos_defconfig: Enable PM_DEBUG ARM: exynos_defconfig: Enable bus frequency scaling with devfreq ARM: imx_v6_v7_defconfig: enable more USB configurations ARM: davinci_all_defconfig: enable SMSC ethernet PHY ARM: davinci_all_defconfig: enable RTC driver as module ARM: multi_v7_defconfig: Enable ARM_IMX6Q_CPUFREQ ...
2016-10-07Merge tag 'armsoc-soc' of ↵Linus Torvalds86-1285/+696
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC platform updates from Arnd Bergmann: "These are updates for platform specific code on 32-bit ARM machines, essentially anything that can not (yet) be expressed using DT files. Noteworthy changes include: - We get support for running in big-endian mode on two platforms: sunxi (Allwinner) and s3c24xx (old Samsung). - The recently added Uniphier platform now uses standard PSCI methods for SMP booting and we remove support for old bootloader versions that did not support it yet. - In sunxi, we gain support for the "Nextthing GR8" SoC, which is a close relative of the Allwinner A13 and R8 chips. - PXA completes its move over to the generic dmaengine framework and removes its old private API - mach-bcm gains support for BCM47189/BCM53573, their first ARM SoC with integrated 802.11ac wireless networking" * tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (54 commits) ARM: imx legacy: pca100: move peripheral initialization to .init_late ARM: imx legacy: mx27ads: move peripheral initialization to .init_late ARM: imx legacy: mx21ads: move peripheral initialization to .init_late ARM: imx legacy: pcm043: move peripheral initialization to .init_late ARM: imx legacy: mx35-3ds: move peripheral initialization to .init_late ARM: imx legacy: mx27-3ds: move peripheral initialization to .init_late ARM: imx legacy: imx27-visstrim-m10: move peripheral initialization to .init_late ARM: imx legacy: vpr200: move peripheral initialization to .init_late ARM: imx legacy: mx31moboard: move peripheral initialization to .init_late ARM: imx legacy: armadillo5x0: move peripheral initialization to .init_late ARM: imx legacy: qong: move peripheral initialization to .init_late ARM: imx legacy: mx31-3ds: move peripheral initialization to .init_late ARM: imx legacy: pcm037: move peripheral initialization to .init_late ARM: imx legacy: mx31lilly: move peripheral initialization to .init_late ARM: imx legacy: mx31ads: move peripheral initialization to .init_late ARM: imx legacy: mx31lite: move peripheral initialization to .init_late ARM: imx legacy: kzm: move peripheral initialization to .init_late MAINTAINERS: update list of Oxnas maintainers ARM: orion5x: remove extraneous NO_IRQ ARM: orion: simplify orion_ge00_switch_init ...
2016-10-07Merge tag 'armsoc-cleanup' of ↵Linus Torvalds101-8108/+105
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC cleanups from Arnd Bergmann: "The cleanups for v4.9 are a little larger that usual, but thankfully that is almost exclusively due to removing a significant number of files that have become obsolete after the still ongoing conversion of old board files to devicetree. - for mach-omap2, which is still the largest platform in arch/arm/, the conversion to DT is finally complete after the Nokia N900 is now fully supported there, along with the omap3 LDP, and we can remove those two board files. If no regressions are found, another large cleanup for the platform will happen as a follow-up, removing dead code and restructuring the platform based on being DT-only. - In mach-imx, similar work is ongoing, but has not come that far. This time, we remove the obsolete board file for the i.MX1 generation, which like i.MX25, i.MX5, i.MX6, and i.MX7 is now DT-only. The remaining board files are for i.MX2 and i.MX3 machines based on old ARM926 or ARM1136 cores that should work with DT in principle. - realview has just been converted from board files to DT, and a lot of code gets removed in the process. This is the last ARM/Keil/Versatile derived platform that was still using board files, the other ones being integrator, versatile and vexpress. We can probably merge the remaining code into a single directory in the near future. - clps711x had completed the conversion in v4.8, but we accidentally left the files in place that should have been deleted then" * tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (21 commits) ARM: select PCI_DOMAINS config from ARCH_MULTIPLATFORM ARM: stop *MIGHT_HAVE_PCI* config from being selected redundantly ARM: imx: (trivial) fix typo and grammar ARM: clps711x: remove extraneous files ARM: imx: use IS_ENABLED() instead of checking for built-in or module ARM: OMAP2+: use IS_ENABLED() instead of checking for built-in or module ARM: OMAP1: use IS_ENABLED() instead of checking for built-in or module ARM: imx: remove platform-mxc_rnga ARM: realview: imply device tree boot ARM: realview: no need to select SMP_ON_UP explicitly ARM: realview: delete the RealView board files ARM: imx: no need to select SMP_ON_UP explicitly ARM: i.MX: Move SOC_IMX1 into 'Device tree only' ARM: i.MX: Remove i.MX1 non-DT support ARM: i.MX: Remove i.MX1 Synertronixx SCB9328 board support ARM: i.MX: Remove i.MX1 Armadeus APF9328 board support ARM: mxs: remove obsolete startup code for TX28 ARM: i.MX31 iomux: remove duplicates with alternate name ARM: i.MX31 iomux: remove plain duplicates ARM: OMAP2+: Drop legacy board file for LDP ...
2016-10-07Merge branch 'parisc-4.9-1' of ↵Linus Torvalds21-207/+308
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc updates from Helge Deller: "Changes include: - Fix boot of 32bit SMP kernel (initial kernel mapping was too small) - Added hardened usercopy checks - Drop bootmem and switch to memblock and NO_BOOTMEM implementation - Drop the BROKEN_RODATA config option (and thus remove the relevant code from the generic headers and files because parisc was the last architecture which used this config option) - Improve segfault reporting by printing human readable error strings - Various smaller changes, e.g. dwarf debug support for assembly code, update comments regarding copy_user_page_asm, switch to kmalloc_array()" * 'parisc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Increase KERNEL_INITIAL_SIZE for 32-bit SMP kernels parisc: Drop bootmem and switch to memblock parisc: Add hardened usercopy feature parisc: Add cfi_startproc and cfi_endproc to assembly code parisc: Move hpmc stack into page aligned bss section parisc: Fix self-detected CPU stall warnings on Mako machines parisc: Report trap type as human readable string parisc: Update comment regarding implementation of copy_user_page_asm parisc: Use kmalloc_array() in add_system_map_addresses() parisc: Check return value of smp_boot_one_cpu() parisc: Drop BROKEN_RODATA config option
2016-10-07Merge branch 'for-linus' of ↵Linus Torvalds2-2/+3
git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32 Pull avr32 update from Hans-Christian Noren Egtvedt. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32: avr32: migrate exception table users off module.h and onto extable.h
2016-10-07Merge tag 'powerpc-4.9-1' of ↵Linus Torvalds227-2904/+5444
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: "Highlights: - Major rework of Book3S 64-bit exception vectors (Nicholas Piggin) - Use gas sections for arranging exception vectors et. al. - Large set of TM cleanups and selftests (Cyril Bur) - Enable transactional memory (TM) lazily for userspace (Cyril Bur) - Support for XZ compression in the zImage wrapper (Oliver O'Halloran) - Add support for bpf constant blinding (Naveen N. Rao) - Beginnings of upstream support for PA Semi Nemo motherboards (Darren Stevens) Fixes: - Ensure .mem(init|exit).text are within _stext/_etext (Michael Ellerman) - xmon: Don't use ld on 32-bit (Michael Ellerman) - vdso64: Use double word compare on pointers (Anton Blanchard) - powerpc/nvram: Fix an incorrect partition merge (Pan Xinhui) - powerpc: Fix usage of _PAGE_RO in hugepage (Christophe Leroy) - powerpc/mm: Update FORCE_MAX_ZONEORDER range to allow hugetlb w/4K (Aneesh Kumar K.V) - Fix memory leak in queue_hotplug_event() error path (Andrew Donnellan) - Replay hypervisor maintenance interrupt first (Nicholas Piggin) Various performance optimisations (Anton Blanchard): - Align hot loops of memset() and backwards_memcpy() - During context switch, check before setting mm_cpumask - Remove static branch prediction in atomic{, 64}_add_unless - Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little endian - Set default CPU type to POWER8 for little endian builds Cleanups & features: - Sparse fixes/cleanups (Daniel Axtens) - Preserve CFAR value on SLB miss caused by access to bogus address (Paul Mackerras) - Radix MMU fixups for POWER9 (Aneesh Kumar K.V) - Support for setting used_(vsr|vr|spe) in sigreturn path (for CRIU) (Simon Guo) - Optimise syscall entry for virtual, relocatable case (Nicholas Piggin) - Optimise MSR handling in exception handling (Nicholas Piggin) - Support for kexec with Radix MMU (Benjamin Herrenschmidt) - powernv EEH fixes (Russell Currey) - Suprise PCI hotplug support for powernv (Gavin Shan) - Endian/sparse fixes for powernv PCI (Gavin Shan) - Defconfig updates (Anton Blanchard) - KVM: PPC: Book3S HV: Migrate pinned pages out of CMA (Balbir Singh) - cxl: Flush PSL cache before resetting the adapter (Frederic Barrat) - cxl: replace loop with for_each_child_of_node(), remove unneeded of_node_put() (Andrew Donnellan) - Fix HV facility unavailable to use correct handler (Nicholas Piggin) - Remove unnecessary syscall trampoline (Nicholas Piggin) - fadump: Fix build break when CONFIG_PROC_VMCORE=n (Michael Ellerman) - Quieten EEH message when no adapters are found (Anton Blanchard) - powernv: Add PHB register dump debugfs handle (Russell Currey) - Use kprobe blacklist for exception handlers & asm functions (Nicholas Piggin) - Document the syscall ABI (Nicholas Piggin) - MAINTAINERS: Update cxl maintainers (Michael Neuling) - powerpc: Remove all usages of NO_IRQ (Michael Ellerman) Minor cleanups: - Andrew Donnellan, Christophe Leroy, Colin Ian King, Cyril Bur, Frederic Barrat, Pan Xinhui, PrasannaKumar Muralidharan, Rui Teng, Simon Guo" * tag 'powerpc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (156 commits) powerpc/bpf: Add support for bpf constant blinding powerpc/bpf: Implement support for tail calls powerpc/bpf: Introduce accessors for using the tmp local stack space powerpc/fadump: Fix build break when CONFIG_PROC_VMCORE=n powerpc: tm: Enable transactional memory (TM) lazily for userspace powerpc/tm: Add TM Unavailable Exception powerpc: Remove do_load_up_transact_{fpu,altivec} powerpc: tm: Rename transct_(*) to ck(\1)_state powerpc: tm: Always use fp_state and vr_state to store live registers selftests/powerpc: Add checks for transactional VSXs in signal contexts selftests/powerpc: Add checks for transactional VMXs in signal contexts selftests/powerpc: Add checks for transactional FPUs in signal contexts selftests/powerpc: Add checks for transactional GPRs in signal contexts selftests/powerpc: Check that signals always get delivered selftests/powerpc: Add TM tcheck helpers in C selftests/powerpc: Allow tests to extend their kill timeout selftests/powerpc: Introduce GPR asm helper header file selftests/powerpc: Move VMX stack frame macros to header file selftests/powerpc: Rework FPU stack placement macros and move to header file selftests/powerpc: Check for VSX preservation across userspace preemption ...
2016-10-07console: don't prefer first registered if DT specifies stdout-pathPaul Burton3-1/+20
If a device tree specifies a preferred device for kernel console output via the stdout-path or linux,stdout-path chosen node properties or the stdout alias then the kernel ought to honor it & output the kernel console to that device. As it stands, this isn't the case. Whilst we parse the stdout-path properties & set an of_stdout variable from of_alias_scan(), and use that from of_console_check() to determine whether to add a console device as a preferred console whilst registering it, we also prefer the first registered console if no other has been selected at the time of its registration. This means that if a console other than the one the device tree selects via stdout-path is registered first, we will switch to using it & when the stdout-path console is later registered the call to add_preferred_console() via of_console_check() is too late to do anything useful. In practice this seems to mean that we switch to the dummy console device fairly early & see no further console output: Console: colour dummy device 80x25 console [tty0] enabled bootconsole [ns16550a0] disabled Fix this by not automatically preferring the first registered console if one is specified by the device tree. This allows consoles to be registered but not enabled, and once the driver for the console selected by stdout-path calls of_console_check() the driver will be added to the list of preferred consoles before any other console has been enabled. When that console is then registered via register_console() it will be enabled as expected. Link: http://lkml.kernel.org/r/20160809151937.26118-1-paul.burton@imgtec.com Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Tejun Heo <tj@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Ivan Delalande <colona@arista.com> Cc: Thierry Reding <treding@nvidia.com> Cc: Borislav Petkov <bp@suse.de> Cc: Jan Kara <jack@suse.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Joe Perches <joe@perches.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07cred: simpler, 1D supplementary groupsAlexey Dobriyan14-85/+46
Current supplementary groups code can massively overallocate memory and is implemented in a way so that access to individual gid is done via 2D array. If number of gids is <= 32, memory allocation is more or less tolerable (140/148 bytes). But if it is not, code allocates full page (!) regardless and, what's even more fun, doesn't reuse small 32-entry array. 2D array means dependent shifts, loads and LEAs without possibility to optimize them (gid is never known at compile time). All of the above is unnecessary. Switch to the usual trailing-zero-len-array scheme. Memory is allocated with kmalloc/vmalloc() and only as much as needed. Accesses become simpler (LEA 8(gi,idx,4) or even without displacement). Maximum number of gids is 65536 which translates to 256KB+8 bytes. I think kernel can handle such allocation. On my usual desktop system with whole 9 (nine) aux groups, struct group_info shrinks from 148 bytes to 44 bytes, yay! Nice side effects: - "gi->gid[i]" is shorter than "GROUP_AT(gi, i)", less typing, - fix little mess in net/ipv4/ping.c should have been using GROUP_AT macro but this point becomes moot, - aux group allocation is persistent and should be accounted as such. Link: http://lkml.kernel.org/r/20160817201927.GA2096@p183.telecom.by Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Vasily Kulikov <segoon@openwall.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07CREDITS: update Pavel's information, add GPG key, remove snail mail addressPavel Machek1-4/+4
Link: http://lkml.kernel.org/r/20161003082312.GA20634@amd Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07mailmap: add Johan HovoldJohan Hovold1-0/+2
Add two entries to map to my primary address. Link: http://lkml.kernel.org/r/1473850348-19177-1-git-send-email-johan@kernel.org Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07.gitattributes: set git diff driver for C source code filesJean Delvare1-0/+2
Git can be told to apply language-specific rules when generating diffs. Enable this for C source code files (*.c and *.h) so that function names are printed right. Specifically, doing so prevents "git diff" from mistakenly considering unindented goto labels as function names. Link: http://lkml.kernel.org/r/20160907143403.1449324f@endymion Signed-off-by: Jean Delvare <jdelvare@suse.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Joe Perches <joe@perches.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07uprobes: remove function declarations from arch/{mips,s390}Marcin Nowakowski2-22/+0
The declarations of arch-specific functions have been moved to a common header in commit 3820b4d2789f ('uprobes: Move function declarations out of arch'), but MIPS and S390 has added them to their own trees later. Remove the unnecessary duplicates. Link: http://lkml.kernel.org/r/1472804384-17830-1-git-send-email-marcin.nowakowski@imgtec.com Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07spelling.txt: "modeled" is spelt correctlyJoe Perches1-1/+0
No need to correct the correct. Link: http://lkml.kernel.org/r/1472490791.3425.38.camel@perches.com Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07nmi_backtrace: generate one-line reports for idle cpusChris Metcalf49-22/+93
When doing an nmi backtrace of many cores, most of which are idle, the output is a little overwhelming and very uninformative. Suppress messages for cpus that are idling when they are interrupted and just emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN". We do this by grouping all the cpuidle code together into a new .cpuidle.text section, and then checking the address of the interrupted PC to see if it lies within that section. This commit suitably tags x86 and tile idle routines, and only adds in the minimal framework for other architectures. Link: http://lkml.kernel.org/r/1472487169-14923-5-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm] Tested-by: Petr Mladek <pmladek@suse.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07arch/tile: adopt the new nmi_backtrace frameworkChris Metcalf4-63/+27
Previously tile was rolling its own method of capturing backtrace data in the NMI handlers, but it was relying on running printk() from the NMI handler, which is not always safe. So adopt the nmi_backtrace model (with the new cpumask extension) instead. So we can call the nmi_backtrace code directly from the nmi handler, move the nmi_enter()/exit() into the top-level tile NMI handler. The semantics of the routine change slightly since it is now synchronous with the remote cores completing the backtraces. Previously it was asynchronous, but with protection to avoid starting a new remote backtrace if the old one was still in progress. Link: http://lkml.kernel.org/r/1472487169-14923-4-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: Daniel Thompson <daniel.thompson@linaro.org> [arm] Cc: Petr Mladek <pmladek@suse.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07nmi_backtrace: do a local dump_stack() instead of a self-NMIChris Metcalf2-9/+9
Currently on arm there is code that checks whether it should call dump_stack() explicitly, to avoid trying to raise an NMI when the current context is not preemptible by the backtrace IPI. Similarly, the forthcoming arch/tile support uses an IPI mechanism that does not support generating an NMI to self. Accordingly, move the code that guards this case into the generic mechanism, and invoke it unconditionally whenever we want a backtrace of the current cpu. It seems plausible that in all cases, dump_stack() will generate better information than generating a stack from the NMI handler. The register state will be missing, but that state is likely not particularly helpful in any case. Or, if we think it is helpful, we should be capturing and emitting the current register state in all cases when regs == NULL is passed to nmi_cpu_backtrace(). Link: http://lkml.kernel.org/r/1472487169-14923-3-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm] Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Aaron Tomlin <atomlin@redhat.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07nmi_backtrace: add more trigger_*_cpu_backtrace() methodsChris Metcalf10-39/+72
Patch series "improvements to the nmi_backtrace code" v9. This patch series modifies the trigger_xxx_backtrace() NMI-based remote backtracing code to make it more flexible, and makes a few small improvements along the way. The motivation comes from the task isolation code, where there are scenarios where we want to be able to diagnose a case where some cpu is about to interrupt a task-isolated cpu. It can be helpful to see both where the interrupting cpu is, and also an approximation of where the cpu that is being interrupted is. The nmi_backtrace framework allows us to discover the stack of the interrupted cpu. I've tested that the change works as desired on tile, and build-tested x86, arm, mips, and sparc64. For x86 I confirmed that the generic cpuidle stuff as well as the architecture-specific routines are in the new cpuidle section. For arm, mips, and sparc I just build-tested it and made sure the generic cpuidle routines were in the new cpuidle section, but I didn't attempt to figure out which the platform-specific idle routines might be. That might be more usefully done by someone with platform experience in follow-up patches. This patch (of 4): Currently you can only request a backtrace of either all cpus, or all cpus but yourself. It can also be helpful to request a remote backtrace of a single cpu, and since we want that, the logical extension is to support a cpumask as the underlying primitive. This change modifies the existing lib/nmi_backtrace.c code to take a cpumask as its basic primitive, and modifies the linux/nmi.h code to use the new "cpumask" method instead. The existing clients of nmi_backtrace (arm and x86) are converted to using the new cpumask approach in this change. The other users of the backtracing API (sparc64 and mips) are converted to use the cpumask approach rather than the all/allbutself approach. The mips code ignored the "include_self" boolean but with this change it will now also dump a local backtrace if requested. Link: http://lkml.kernel.org/r/1472487169-14923-2-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm] Reviewed-by: Aaron Tomlin <atomlin@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07min/max: remove sparse warnings when they're nestedJohannes Berg1-20/+28
Currently, when min/max are nested within themselves, sparse will warn: warning: symbol '_min1' shadows an earlier one originally declared here warning: symbol '_min1' shadows an earlier one originally declared here warning: symbol '_min2' shadows an earlier one originally declared here This also immediately happens when min3() or max3() are used. Since sparse implements __COUNTER__, we can use __UNIQUE_ID() to generate unique variable names, avoiding this. Link: http://lkml.kernel.org/r/1471519773-29882-1-git-send-email-johannes@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07Documentation/filesystems/proc.txt: add more description for maps/smapsRobert Ho1-0/+12
Add some more description on the limitations for smaps/maps readings, as well as some guaruntees we can make. Link: http://lkml.kernel.org/r/1475296958-27652-2-git-send-email-robert.hu@intel.com Signed-off-by: Robert Ho <robert.hu@intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Cc: Robert Hu <robert.hu@intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Gleb Natapov <gleb@kernel.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07mm, proc: fix region lost in /proc/self/smapsRobert Ho1-3/+5
Recently, Redhat reported that nvml test suite failed on QEMU/KVM, more detailed info please refer to: https://bugzilla.redhat.com/show_bug.cgi?id=1365721 Actually, this bug is not only for NVDIMM/DAX but also for any other file systems. This simple test case abstracted from nvml can easily reproduce this bug in common environment: -------------------------- testcase.c ----------------------------- int is_pmem_proc(const void *addr, size_t len) { const char *caddr = addr; FILE *fp; if ((fp = fopen("/proc/self/smaps", "r")) == NULL) { printf("!/proc/self/smaps"); return 0; } int retval = 0; /* assume false until proven otherwise */ char line[PROCMAXLEN]; /* for fgets() */ char *lo = NULL; /* beginning of current range in smaps file */ char *hi = NULL; /* end of current range in smaps file */ int needmm = 0; /* looking for mm flag for current range */ while (fgets(line, PROCMAXLEN, fp) != NULL) { static const char vmflags[] = "VmFlags:"; static const char mm[] = " wr"; /* check for range line */ if (sscanf(line, "%p-%p", &lo, &hi) == 2) { if (needmm) { /* last range matched, but no mm flag found */ printf("never found mm flag.\n"); break; } else if (caddr < lo) { /* never found the range for caddr */ printf("#######no match for addr %p.\n", caddr); break; } else if (caddr < hi) { /* start address is in this range */ size_t rangelen = (size_t)(hi - caddr); /* remember that matching has started */ needmm = 1; /* calculate remaining range to search for */ if (len > rangelen) { len -= rangelen; caddr += rangelen; printf("matched %zu bytes in range " "%p-%p, %zu left over.\n", rangelen, lo, hi, len); } else { len = 0; printf("matched all bytes in range " "%p-%p.\n", lo, hi); } } } else if (needmm && strncmp(line, vmflags, sizeof(vmflags) - 1) == 0) { if (strstr(&line[sizeof(vmflags) - 1], mm) != NULL) { printf("mm flag found.\n"); if (len == 0) { /* entire range matched */ retval = 1; break; } needmm = 0; /* saw what was needed */ } else { /* mm flag not set for some or all of range */ printf("range has no mm flag.\n"); break; } } } fclose(fp); printf("returning %d.\n", retval); return retval; } void *Addr; size_t Size; /* * worker -- the work each thread performs */ static void * worker(void *arg) { int *ret = (int *)arg; *ret = is_pmem_proc(Addr, Size); return NULL; } int main(int argc, char *argv[]) { if (argc < 2 || argc > 3) { printf("usage: %s file [env].\n", argv[0]); return -1; } int fd = open(argv[1], O_RDWR); struct stat stbuf; fstat(fd, &stbuf); Size = stbuf.st_size; Addr = mmap(0, stbuf.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); close(fd); pthread_t threads[NTHREAD]; int ret[NTHREAD]; /* kick off NTHREAD threads */ for (int i = 0; i < NTHREAD; i++) pthread_create(&threads[i], NULL, worker, &ret[i]); /* wait for all the threads to complete */ for (int i = 0; i < NTHREAD; i++) pthread_join(threads[i], NULL); /* verify that all the threads return the same value */ for (int i = 1; i < NTHREAD; i++) { if (ret[0] != ret[i]) { printf("Error i %d ret[0] = %d ret[i] = %d.\n", i, ret[0], ret[i]); } } printf("%d", ret[0]); return 0; } It failed as some threads can not find the memory region in "/proc/self/smaps" which is allocated in the main process It is caused by proc fs which uses 'file->version' to indicate the VMA that is the last one has already been handled by read() system call. When the next read() issues, it uses the 'version' to find the VMA, then the next VMA is what we want to handle, the related code is as follows: if (last_addr) { vma = find_vma(mm, last_addr); if (vma && (vma = m_next_vma(priv, vma))) return vma; } However, VMA will be lost if the last VMA is gone, e.g: The process VMA list is A->B->C->D CPU 0 CPU 1 read() system call handle VMA B version = B return to userspace unmap VMA B issue read() again to continue to get the region info find_vma(version) will get VMA C m_next_vma(C) will get VMA D handle D !!! VMA C is lost !!! In order to fix this bug, we make 'file->version' indicate the end address of the current VMA. m_start will then look up a vma which with vma_start < last_vm_end and moves on to the next vma if we found the same or an overlapping vma. This will guarantee that we will not miss an exclusive vma but we can still miss one if the previous vma was shrunk. This is acceptable because guaranteeing "never miss a vma" is simply not feasible. User has to cope with some inconsistencies if the file is not read in one go. [mhocko@suse.com: changelog fixes] Link: http://lkml.kernel.org/r/1475296958-27652-1-git-send-email-robert.hu@intel.com Acked-by: Dave Hansen <dave.hansen@intel.com> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Robert Hu <robert.hu@intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Gleb Natapov <gleb@kernel.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07proc: fix timerslack_ns CAP_SYS_NICE check when adjusting selfJohn Stultz1-15/+19
In changing from checking ptrace_may_access(p, PTRACE_MODE_ATTACH_FSCREDS) to capable(CAP_SYS_NICE), I missed that ptrace_my_access succeeds when p == current, but the CAP_SYS_NICE doesn't. Thus while the previous commit was intended to loosen the needed privileges to modify a processes timerslack, it needlessly restricted a task modifying its own timerslack via the proc/<tid>/timerslack_ns (which is permitted also via the PR_SET_TIMERSLACK method). This patch corrects this by checking if p == current before checking the CAP_SYS_NICE value. This patch applies on top of my two previous patches currently in -mm Link: http://lkml.kernel.org/r/1471906870-28624-1-git-send-email-john.stultz@linaro.org Signed-off-by: John Stultz <john.stultz@linaro.org> Acked-by: Kees Cook <keescook@chromium.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Oren Laadan <orenl@cellrox.com> Cc: Ruchi Kandoi <kandoiruchi@google.com> Cc: Rom Lemarchand <romlem@android.com> Cc: Todd Kjos <tkjos@google.com> Cc: Colin Cross <ccross@android.com> Cc: Nick Kralevich <nnk@google.com> Cc: Dmitry Shmidt <dimitrysh@google.com> Cc: Elliott Hughes <enh@google.com> Cc: Android Kernel Team <kernel-team@android.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07proc: add LSM hook checks to /proc/<tid>/timerslack_nsJohn Stultz1-0/+10
As requested, this patch checks the existing LSM hooks task_getscheduler/task_setscheduler when reading or modifying the task's timerslack value. Previous versions added new get/settimerslack LSM hooks, but since they checked the same PROCESS__SET/GETSCHED values as existing hooks, it was suggested we just use the existing ones. Link: http://lkml.kernel.org/r/1469132667-17377-2-git-send-email-john.stultz@linaro.org Signed-off-by: John Stultz <john.stultz@linaro.org> Cc: Kees Cook <keescook@chromium.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Oren Laadan <orenl@cellrox.com> Cc: Ruchi Kandoi <kandoiruchi@google.com> Cc: Rom Lemarchand <romlem@android.com> Cc: Todd Kjos <tkjos@google.com> Cc: Colin Cross <ccross@android.com> Cc: Nick Kralevich <nnk@google.com> Cc: Dmitry Shmidt <dimitrysh@google.com> Cc: Elliott Hughes <enh@google.com> Cc: James Morris <jmorris@namei.org> Cc: Android Kernel Team <kernel-team@android.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07proc: relax /proc/<tid>/timerslack_ns capability requirementsJohn Stultz1-14/+20
When an interface to allow a task to change another tasks timerslack was first proposed, it was suggested that something greater then CAP_SYS_NICE would be needed, as a task could be delayed further then what normally could be done with nice adjustments. So CAP_SYS_PTRACE was adopted instead for what became the /proc/<tid>/timerslack_ns interface. However, for Android (where this feature originates), giving the system_server CAP_SYS_PTRACE would allow it to observe and modify all tasks memory. This is considered too high a privilege level for only needing to change the timerslack. After some discussion, it was realized that a CAP_SYS_NICE process can set a task as SCHED_FIFO, so they could fork some spinning processes and set them all SCHED_FIFO 99, in effect delaying all other tasks for an infinite amount of time. So as a CAP_SYS_NICE task can already cause trouble for other tasks, using it as a required capability for accessing and modifying /proc/<tid>/timerslack_ns seems sufficient. Thus, this patch loosens the capability requirements to CAP_SYS_NICE and removes CAP_SYS_PTRACE, simplifying some of the code flow as well. This is technically an ABI change, but as the feature just landed in 4.6, I suspect no one is yet using it. Link: http://lkml.kernel.org/r/1469132667-17377-1-git-send-email-john.stultz@linaro.org Signed-off-by: John Stultz <john.stultz@linaro.org> Reviewed-by: Nick Kralevich <nnk@google.com> Acked-by: Serge Hallyn <serge@hallyn.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Kees Cook <keescook@chromium.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Oren Laadan <orenl@cellrox.com> Cc: Ruchi Kandoi <kandoiruchi@google.com> Cc: Rom Lemarchand <romlem@android.com> Cc: Todd Kjos <tkjos@google.com> Cc: Colin Cross <ccross@android.com> Cc: Nick Kralevich <nnk@google.com> Cc: Dmitry Shmidt <dimitrysh@google.com> Cc: Elliott Hughes <enh@google.com> Cc: Android Kernel Team <kernel-team@android.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07meminfo: break apart a very long seq_printf with #ifdefsJoe Perches1-116/+95
Use a specific routine to emit most lines so that the code is easier to read and maintain. akpm: text data bss dec hex filename 2976 8 0 2984 ba8 fs/proc/meminfo.o before 2669 8 0 2677 a75 fs/proc/meminfo.o after Link: http://lkml.kernel.org/r/8fce7fdef2ba081a4ef531594e97da8a9feebb58.1470810406.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07seq/proc: modify seq_put_decimal_[u]ll to take a const char *, not charJoe Perches5-136/+154
Allow some seq_puts removals by taking a string instead of a single char. [akpm@linux-foundation.org: update vmstat_show(), per Joe] Link: http://lkml.kernel.org/r/667e1cf3d436de91a5698170a1e98d882905e956.1470704995.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: Joe Perches <joe@perches.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07proc: faster /proc/*/statusAlexey Dobriyan1-40/+47
top(1) opens the following files for every PID: /proc/*/stat /proc/*/statm /proc/*/status This patch switches /proc/*/status away from seq_printf(). The result is 13.5% speedup. Benchmark is open("/proc/self/status")+read+close 1.000.000 million times. BEFORE $ perf stat -r 10 taskset -c 3 ./proc-self-status Performance counter stats for 'taskset -c 3 ./proc-self-status' (10 runs): 10748.474301 task-clock (msec) # 0.954 CPUs utilized ( +- 0.91% ) 12 context-switches # 0.001 K/sec ( +- 1.09% ) 1 cpu-migrations # 0.000 K/sec 104 page-faults # 0.010 K/sec ( +- 0.45% ) 37,424,127,876 cycles # 3.482 GHz ( +- 0.04% ) 8,453,010,029 stalled-cycles-frontend # 22.59% frontend cycles idle ( +- 0.12% ) 3,747,609,427 stalled-cycles-backend # 10.01% backend cycles idle ( +- 0.68% ) 65,632,764,147 instructions # 1.75 insn per cycle # 0.13 stalled cycles per insn ( +- 0.00% ) 13,981,324,775 branches # 1300.773 M/sec ( +- 0.00% ) 138,967,110 branch-misses # 0.99% of all branches ( +- 0.18% ) 11.263885428 seconds time elapsed ( +- 0.04% ) ^^^^^^^^^^^^ AFTER $ perf stat -r 10 taskset -c 3 ./proc-self-status Performance counter stats for 'taskset -c 3 ./proc-self-status' (10 runs): 9010.521776 task-clock (msec) # 0.925 CPUs utilized ( +- 1.54% ) 11 context-switches # 0.001 K/sec ( +- 1.54% ) 1 cpu-migrations # 0.000 K/sec ( +- 11.11% ) 103 page-faults # 0.011 K/sec ( +- 0.60% ) 32,352,310,603 cycles # 3.591 GHz ( +- 0.07% ) 7,849,199,578 stalled-cycles-frontend # 24.26% frontend cycles idle ( +- 0.27% ) 3,269,738,842 stalled-cycles-backend # 10.11% backend cycles idle ( +- 0.73% ) 56,012,163,567 instructions # 1.73 insn per cycle # 0.14 stalled cycles per insn ( +- 0.00% ) 11,735,778,795 branches # 1302.453 M/sec ( +- 0.00% ) 98,084,459 branch-misses # 0.84% of all branches ( +- 0.28% ) 9.741247736 seconds time elapsed ( +- 0.07% ) ^^^^^^^^^^^ Link: http://lkml.kernel.org/r/20160806125608.GB1187@p183.telecom.by Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Joe Perches <joe@perches.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07proc: much faster /proc/vmstatAlexey Dobriyan1-1/+4
Every current KDE system has process named ksysguardd polling files below once in several seconds: $ strace -e trace=open -p $(pidof ksysguardd) Process 1812 attached open("/etc/mtab", O_RDONLY|O_CLOEXEC) = 8 open("/etc/mtab", O_RDONLY|O_CLOEXEC) = 8 open("/proc/net/dev", O_RDONLY) = 8 open("/proc/net/wireless", O_RDONLY) = -1 ENOENT (No such file or directory) open("/proc/stat", O_RDONLY) = 8 open("/proc/vmstat", O_RDONLY) = 8 Hell knows what it is doing but speed up reading /proc/vmstat by 33%! Benchmark is open+read+close 1.000.000 times. BEFORE $ perf stat -r 10 taskset -c 3 ./proc-vmstat Performance counter stats for 'taskset -c 3 ./proc-vmstat' (10 runs): 13146.768464 task-clock (msec) # 0.960 CPUs utilized ( +- 0.60% ) 15 context-switches # 0.001 K/sec ( +- 1.41% ) 1 cpu-migrations # 0.000 K/sec ( +- 11.11% ) 104 page-faults # 0.008 K/sec ( +- 0.57% ) 45,489,799,349 cycles # 3.460 GHz ( +- 0.03% ) 9,970,175,743 stalled-cycles-frontend # 21.92% frontend cycles idle ( +- 0.10% ) 2,800,298,015 stalled-cycles-backend # 6.16% backend cycles idle ( +- 0.32% ) 79,241,190,850 instructions # 1.74 insn per cycle # 0.13 stalled cycles per insn ( +- 0.00% ) 17,616,096,146 branches # 1339.956 M/sec ( +- 0.00% ) 176,106,232 branch-misses # 1.00% of all branches ( +- 0.18% ) 13.691078109 seconds time elapsed ( +- 0.03% ) ^^^^^^^^^^^^ AFTER $ perf stat -r 10 taskset -c 3 ./proc-vmstat Performance counter stats for 'taskset -c 3 ./proc-vmstat' (10 runs): 8688.353749 task-clock (msec) # 0.950 CPUs utilized ( +- 1.25% ) 10 context-switches # 0.001 K/sec ( +- 2.13% ) 1 cpu-migrations # 0.000 K/sec 104 page-faults # 0.012 K/sec ( +- 0.56% ) 30,384,010,730 cycles # 3.497 GHz ( +- 0.07% ) 12,296,259,407 stalled-cycles-frontend # 40.47% frontend cycles idle ( +- 0.13% ) 3,370,668,651 stalled-cycles-backend # 11.09% backend cycles idle ( +- 0.69% ) 28,969,052,879 instructions # 0.95 insn per cycle # 0.42 stalled cycles per insn ( +- 0.01% ) 6,308,245,891 branches # 726.058 M/sec ( +- 0.00% ) 214,685,502 branch-misses # 3.40% of all branches ( +- 0.26% ) 9.146081052 seconds time elapsed ( +- 0.07% ) ^^^^^^^^^^^ vsnprintf() is slow because: 1. format_decode() is busy looking for format specifier: 2 branches per character (not in this case, but in others) 2. approximately million branches while parsing format mini language and everywhere 3. just look at what string() does /proc/vmstat is good case because most of its content are strings Link: http://lkml.kernel.org/r/20160806125455.GA1187@p183.telecom.by Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Joe Perches <joe@perches.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07atomic64: no need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVEVineet Gupta12-17/+0
This came to light when implementing native 64-bit atomics for ARCv2. The atomic64 self-test code uses CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE to check whether atomic64_dec_if_positive() is available. It seems it was needed when not every arch defined it. However as of current code the Kconfig option seems needless - for CONFIG_GENERIC_ATOMIC64 it is auto-enabled in lib/Kconfig and a generic definition of API is present lib/atomic64.c - arches with native 64-bit atomics select it in arch/*/Kconfig and define the API in their headers So I see no point in keeping the Kconfig option Compile tested for: - blackfin (CONFIG_GENERIC_ATOMIC64) - x86 (!CONFIG_GENERIC_ATOMIC64) - ia64 Link: http://lkml.kernel.org/r/1473703083-8625-3-git-send-email-vgupta@synopsys.com Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Ming Lin <ming.l@ssi.samsung.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@suse.de> Cc: Andi Kleen <ak@linux.intel.com> Cc: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07ia64: implement atomic64_dec_if_positiveVineet Gupta1-0/+16
This is based on s390 version and needed to get rid of CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE Link: http://lkml.kernel.org/r/1473703083-8625-2-git-send-email-vgupta@synopsys.com Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07linux/mm.h: canonicalize macro PAGE_ALIGNED() definitionzijun_hu1-1/+1
The macro PAGE_ALIGNED() is prone to cause error because it doesn't follow convention to parenthesize parameter @addr within macro body, for example unsigned long *ptr = kmalloc(...); PAGE_ALIGNED(ptr + 16); for the left parameter of macro IS_ALIGNED(), (unsigned long)(ptr + 16) is desired but the actual one is (unsigned long)ptr + 16. It is fixed by simply canonicalizing macro PAGE_ALIGNED() definition. Link: http://lkml.kernel.org/r/57EA6AE7.7090807@zoho.com Signed-off-by: zijun_hu <zijun_hu@htc.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07mm: remove unnecessary condition in remove_inode_hugepageszhong jiang3-10/+8
When the huge page is added to the page cahce (huge_add_to_page_cache), the page private flag will be cleared. since this code (remove_inode_hugepages) will only be called for pages in the page cahce, PagePrivate(page) will always be false. The patch remove the code without any functional change. Link: http://lkml.kernel.org/r/1475113323-29368-1-git-send-email-zhongjiang@huawei.com Signed-off-by: zhong jiang <zhongjiang@huawei.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Tested-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07mm: warn about allocations which stall for too longMichal Hocko1-0/+10
Currently we do warn only about allocation failures but small allocations are basically nofail and they might loop in the page allocator for a long time. Especially when the reclaim cannot make any progress - e.g. GFP_NOFS cannot invoke the oom killer and rely on a different context to make a forward progress in case there is a lot memory used by filesystems. Give us at least a clue when something like this happens and warn about allocations which take more than 10s. Print the basic allocation context information along with the cumulative time spent in the allocation as well as the allocation stack. Repeat the warning after every 10 seconds so that we know that the problem is permanent rather than ephemeral. Link: http://lkml.kernel.org/r/20160929084407.7004-3-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Dave Hansen <dave.hansen@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07mm: consolidate warn_alloc_failed usersMichal Hocko3-26/+20
warn_alloc_failed is currently used from the page and vmalloc allocators. This is a good reuse of the code except that vmalloc would appreciate a slightly different warning message. This is already handled by the fmt parameter except that "%s: page allocation failure: order:%u, mode:%#x(%pGg)" is printed anyway. This might be quite misleading because it might be a vmalloc failure which leads to the warning while the page allocator is not the culprit here. Fix this by always using the fmt string and only print the context that makes sense for the particular context (e.g. order makes only very little sense for the vmalloc context). Rename the function to not miss any user and also because a later patch will reuse it also for !failure cases. Link: http://lkml.kernel.org/r/20160929084407.7004-2-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Dave Hansen <dave.hansen@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07vfs,mm: fix a dead loop in truncate_inode_pages_range()Wei Fang1-0/+4
We triggered a deadloop in truncate_inode_pages_range() on 32 bits architecture with the test case bellow: ... fd = open(); write(fd, buf, 4096); preadv64(fd, &iovec, 1, 0xffffffff000); ftruncate(fd, 0); ... Then ftruncate() will not return forever. The filesystem used in this case is ubifs, but it can be triggered on many other filesystems. When preadv64() is called with offset=0xffffffff000, a page with index=0xffffffff will be added to the radix tree of ->mapping. Then this page can be found in ->mapping with pagevec_lookup(). After that, truncate_inode_pages_range(), which is called in ftruncate(), will fall into an infinite loop: - find a page with index=0xffffffff, since index>=end, this page won't be truncated - index++, and index become 0 - the page with index=0xffffffff will be found again The data type of index is unsigned long, so index won't overflow to 0 on 64 bits architecture in this case, and the dead loop won't happen. Since truncate_inode_pages_range() is executed with holding lock of inode->i_rwsem, any operation related with this lock will be blocked, and a hung task will happen, e.g.: INFO: task truncate_test:3364 blocked for more than 120 seconds. ... call_rwsem_down_write_failed+0x17/0x30 generic_file_write_iter+0x32/0x1c0 ubifs_write_iter+0xcc/0x170 __vfs_write+0xc4/0x120 vfs_write+0xb2/0x1b0 SyS_write+0x46/0xa0 The page with index=0xffffffff added to ->mapping is useless. Fix this by checking the read position before allocating pages. Link: http://lkml.kernel.org/r/1475151010-40166-1-git-send-email-fangwei1@huawei.com Signed-off-by: Wei Fang <fangwei1@huawei.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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