1. 23 Feb, 2016 4 commits
  2. 22 Feb, 2016 11 commits
    • Mike Snitzer's avatar
      dm: allocate blk_mq_tag_set rather than embed in mapped_device · 1c357a1e
      Mike Snitzer authored
      The blk_mq_tag_set is only needed for dm-mq support.  There is point
      wasting space in 'struct mapped_device' for non-dm-mq devices.
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> # check kzalloc return
    • Mike Snitzer's avatar
      dm: add 'dm_mq_nr_hw_queues' and 'dm_mq_queue_depth' module params · faad87df
      Mike Snitzer authored
      Allow user to change these values via module params or sysfs.
      'dm_mq_nr_hw_queues' defaults to 1 (max 32).
      'dm_mq_queue_depth' defaults to 2048 (up from 64, which proved far too
      small under moderate sized workloads -- the dm-multipath device would
      continuously block waiting for tags (requests) to become available).
      The maximum is BLK_MQ_MAX_DEPTH (currently 10240).
      Keep in mind the total number of pre-allocated requests per
      request-based dm-mq device is 'dm_mq_nr_hw_queues' * 'dm_mq_queue_depth'
      (currently 2048).
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: optimize dm_request_fn() · c91852ff
      Mike Snitzer authored
      DM multipath is the only request-based DM target -- which only supports
      tables with a single target that is immutable.  Leverage this fact in
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: optimize dm_mq_queue_rq() · 16f12266
      Mike Snitzer authored
      DM multipath is the only dm-mq target.  But that aside, request-based DM
      only supports tables with a single target that is immutable.  Leverage
      this fact in dm_mq_queue_rq() by using the 'immutable_target' stored in
      the mapped_device when the table was made active.  This saves the need
      to even take the read-side of the SRCU via dm_{get,put}_live_table.
      If the active DM table does not have an immutable target (e.g. "error"
      target was swapped in) then fallback to the slow-path where the target
      is looked up from the live table.
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: set DM_TARGET_WILDCARD feature on "error" target · f083b09b
      Mike Snitzer authored
      The DM_TARGET_WILDCARD feature indicates that the "error" target may
      replace any target; even immutable targets.  This feature will be useful
      to preserve the ability to replace the "multipath" target even once it
      is formally converted over to having the DM_TARGET_IMMUTABLE feature.
      Also, implicit in the DM_TARGET_WILDCARD feature flag being set is that
      .map, .map_rq, .clone_and_map_rq and .release_clone_rq are all defined
      in the target_type.
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: cleanup dm_any_congested() · e522c039
      Mike Snitzer authored
      The request-based DM support for checking queue congestion doesn't
      require access to the live DM table.
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: remove unused dm_get_rq_mapinfo() · ae6ad75e
      Mike Snitzer authored
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: fix excessive dm-mq context switching · 6acfe68b
      Mike Snitzer authored
      Request-based DM's blk-mq support (dm-mq) was reported to be 50% slower
      than if an underlying null_blk device were used directly.  One of the
      reasons for this drop in performance is that blk_insert_clone_request()
      was calling blk_mq_insert_request() with @async=true.  This forced the
      use of kblockd_schedule_delayed_work_on() to run the blk-mq hw queues
      which ushered in ping-ponging between process context (fio in this case)
      and kblockd's kworker to submit the cloned request.  The ftrace
      function_graph tracer showed:
        kworker-2013  =>   fio-12190
        fio-12190    =>  kworker-2013
        kworker-2013  =>   fio-12190
        fio-12190    =>  kworker-2013
      Fixing blk_insert_clone_request()'s blk_mq_insert_request() call to
      _not_ use kblockd to submit the cloned requests isn't enough to
      eliminate the observed context switches.
      In addition to this dm-mq specific blk-core fix, there are 2 DM core
      fixes to dm-mq that (when paired with the blk-core fix) completely
      eliminate the observed context switching:
      1)  don't blk_mq_run_hw_queues in blk-mq request completion
          Motivated by desire to reduce overhead of dm-mq, punting to kblockd
          just increases context switches.
          In my testing against a really fast null_blk device there was no benefit
          to running blk_mq_run_hw_queues() on completion (and no other blk-mq
          driver does this).  So hopefully this change doesn't induce the need for
          yet another revert like commit 621739b0 !
      2)  use blk_mq_complete_request() in dm_complete_request()
          blk_complete_request() doesn't offer the traditional q->mq_ops vs
          .request_fn branching pattern that other historic block interfaces
          do (e.g. blk_get_request).  Using blk_mq_complete_request() for
          blk-mq requests is important for performance.  It should be noted
          that, like blk_complete_request(), blk_mq_complete_request() doesn't
          natively handle partial completions -- but the request-based
          DM-multipath target does provide the required partial completion
          support by dm.c:end_clone_bio() triggering requeueing of the request
          via dm-mpath.c:multipath_end_io()'s return of DM_ENDIO_REQUEUE.
      dm-mq fix #2 is _much_ more important than #1 for eliminating the
      context switches.
      Before: cpu          : usr=15.10%, sys=59.39%, ctx=7905181, majf=0, minf=475
      After:  cpu          : usr=20.60%, sys=79.35%, ctx=2008, majf=0, minf=472
      With these changes multithreaded async read IOPs improved from ~950K
      to ~1350K for this dm-mq stacked on null_blk test-case.  The raw read
      IOPs of the underlying null_blk device for the same workload is ~1950K.
      Fixes: 7fb4898e ("block: add blk-mq support to blk_insert_cloned_request()")
      Fixes: bfebd1cd
       ("dm: add full blk-mq support to request-based DM")
      Cc: stable@vger.kernel.org # 4.1+
      Reported-by: default avatarSagi Grimberg <sagig@dev.mellanox.co.il>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Acked-by: default avatarJens Axboe <axboe@kernel.dk>
    • Mike Snitzer's avatar
      dm: fix sparse "unexpected unlock" warnings in ioctl code · 956a4025
      Mike Snitzer authored
      Rename dm_get_live_table_for_ioctl to dm_grab_bdev_for_ioctl and have it
      do the dm_{get,put}_live_table() rather than split those operations.
      The dm_grab_bdev_for_ioctl() callers only care about the block_device
      associated with a singleton DM device so there isn't any need to retain
      a reference to the live DM table.  It is sufficient to:
      1) dm_get_live_table()
      2) bdgrab() the bdev associated with the singleton table's target
      3) dm_put_live_table()
      4) bdput() the bdev
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: do not return target from dm_get_live_table_for_ioctl() · 66482026
      Mike Snitzer authored
      None of the callers actually used the returned target.
      Also, just reuse bdev pointer passed to dm_blk_ioctl().
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    • Mike Snitzer's avatar
      dm: fix dm_rq_target_io leak on faults with .request_fn DM w/ blk-mq paths · 4328daa2
      Mike Snitzer authored
      Using request-based DM mpath configured with the following stacking
      (.request_fn DM mpath ontop of scsi-mq paths):
      echo Y > /sys/module/scsi_mod/parameters/use_blk_mq
      echo N > /sys/module/dm_mod/parameters/use_blk_mq
      'struct dm_rq_target_io' would leak if a request is requeued before a
      blk-mq clone is allocated (or fails to allocate).  free_rq_tio()
      wasn't being called.
      kmemleak reported:
      unreferenced object 0xffff8800b90b98c0 (size 112):
        comm "kworker/7:1H", pid 5692, jiffies 4295056109 (age 78.589s)
        hex dump (first 32 bytes):
          00 d0 5c 2c 03 88 ff ff 40 00 bf 01 00 c9 ff ff  ..\,....@.......
          e0 d9 b1 34 00 88 ff ff 00 00 00 00 00 00 00 00  ...4............
          [<ffffffff81672b6e>] kmemleak_alloc+0x4e/0xb0
          [<ffffffff811dbb63>] kmem_cache_alloc+0xc3/0x1e0
          [<ffffffff8117eae5>] mempool_alloc_slab+0x15/0x20
          [<ffffffff8117ec1e>] mempool_alloc+0x6e/0x170
          [<ffffffffa00029ac>] dm_old_prep_fn+0x3c/0x180 [dm_mod]
          [<ffffffff812fbd78>] blk_peek_request+0x168/0x290
          [<ffffffffa0003e62>] dm_request_fn+0xb2/0x1b0 [dm_mod]
          [<ffffffff812f66e3>] __blk_run_queue+0x33/0x40
          [<ffffffff812f9585>] blk_delay_work+0x25/0x40
          [<ffffffff81096fff>] process_one_work+0x14f/0x3d0
          [<ffffffff81097715>] worker_thread+0x125/0x4b0
          [<ffffffff8109ce88>] kthread+0xd8/0xf0
          [<ffffffff8167cb8f>] ret_from_fork+0x3f/0x70
          [<ffffffffffffffff>] 0xffffffffffffffff
      crash> struct -o dm_rq_target_io
      struct dm_rq_target_io {
      SIZE: 112
      Fixes: e5863d9a
       ("dm: allocate requests in target when stacking on blk-mq devices")
      Cc: stable@vger.kernel.org # 4.0+
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
  3. 20 Feb, 2016 8 commits
    • Linus Torvalds's avatar
      Linux 4.5-rc5 · 81f70ba2
      Linus Torvalds authored
    • Linus Torvalds's avatar
      Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 0389075e
      Linus Torvalds authored
      Pull x86 fixes from Ingo Molnar:
       "This is unusually large, partly due to the EFI fixes that prevent
        accidental deletion of EFI variables through efivarfs that may brick
        machines.  These fixes are somewhat involved to maintain compatibility
        with existing install methods and other usage modes, while trying to
        turn off the 'rm -rf' bricking vector.
        Other fixes are for large page ioremap()s and for non-temporal
      * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/mm: Fix vmalloc_fault() to handle large pages properly
        hpet: Drop stale URLs
        x86/uaccess/64: Handle the caching of 4-byte nocache copies properly in __copy_user_nocache()
        x86/uaccess/64: Make the __copy_user_nocache() assembly code more readable
        lib/ucs2_string: Correct ucs2 -> utf8 conversion
        efi: Add pstore variables to the deletion whitelist
        efi: Make efivarfs entries immutable by default
        efi: Make our variable validation list include the guid
        efi: Do variable name validation tests in utf8
        efi: Use ucs2_as_utf8 in efivarfs instead of open coding a bad version
        lib/ucs2_string: Add ucs2 -> utf8 helper functions
    • Linus Torvalds's avatar
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 06b74c65
      Linus Torvalds authored
      Pull perf fixes from Ingo Molnar:
       "A handful of CPU hotplug related fixes"
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        perf/core: Plug potential memory leak in CPU_UP_PREPARE
        perf/core: Remove the bogus and dangerous CPU_DOWN_FAILED hotplug state
        perf/core: Remove bogus UP_CANCELED hotplug state
        perf/x86/amd/uncore: Plug reference leak
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · e6a1c1e9
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       - Fix build error on 32-bit with checkpoint restart from Aneesh Kumar
       - Fix dedotify for binutils >= 2.26 from Andreas Schwab
       - Don't trace hcalls on offline CPUs from Denis Kirjanov
       - eeh: Fix stale cached primary bus from Gavin Shan
       - eeh: Fix stale PE primary bus from Gavin Shan
       - mm: Fix Multi hit ERAT cause by recent THP update from Aneesh Kumar K.V
       - ioda: Set "read" permission when "write" is set from Alexey Kardashevskiy
      * tag 'powerpc-4.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/ioda: Set "read" permission when "write" is set
        powerpc/mm: Fix Multi hit ERAT cause by recent THP update
        powerpc/powernv: Fix stale PE primary bus
        powerpc/eeh: Fix stale cached primary bus
        powerpc/pseries: Don't trace hcalls on offline CPUs
        powerpc: Fix dedotify for binutils >= 2.26
        powerpc/book3s_32: Fix build error with checkpoint restart
    • Linus Torvalds's avatar
      Merge tag 'dmaengine-fix-4.5-rc5' of git://git.infradead.org/users/vkoul/slave-dma · da6b7366
      Linus Torvalds authored
      Pull dmaengine fixes from Vinod Koul:
       "A few fixes for drivers, nothing major here.
        Fixes are: iotdma fix to restart channels, new ID for wildcat PCH,
        residue fix for edma, disable irq for non-cyclic in dw"
      * tag 'dmaengine-fix-4.5-rc5' of git://git.infradead.org/users/vkoul/slave-dma:
        dmaengine: dw: disable BLOCK IRQs for non-cyclic xfer
        dmaengine: edma: fix residue race for cyclic
        dmaengine: dw: pci: add ID for WildcatPoint PCH
        dmaengine: IOATDMA: fix timer code that continues to restart channels during idle
    • Linus Torvalds's avatar
      Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux · 37aa4dac
      Linus Torvalds authored
      Pull clk driver fixes from Stephen Boyd:
       "An assortment of vendor specific clk drivers fixes, most notably
        fallout from adding Tegra210 and rockchip rk3036/rk3368 drivers this
        There's also the random smattering of sparse/checker fixes, a build
        "fix" to get the Tango clk driver to compile because the Kconfig
        symbol was renamed after the fact, and a clk gpio fix for a patch
      * tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (28 commits)
        clk: gpio: Really allow an optional clock= DT property
        Revert "clk: qcom: Specify LE device endianness"
        clk: versatile: mask VCO bits before writing
        clk: tegra: super: Fix sparse warnings for functions not declared as static
        clk: tegra: Fix sparse warnings for functions not declared as static
        clk: tegra: Fix sparse warning for pll_m
        clk: tegra: Use definition for pll_u override bit
        clk: tegra: Fix warning caused by pll_u failing to lock
        clk: tegra: Fix clock sources for Tegra210 EMC
        clk: tegra: Add the APB2APE audio clock on Tegra210
        clk: tegra: Add missing of_node_put()
        clk: tegra: Fix PLLE SS coefficients
        clk: tegra: Fix typos around clearing PLLE bits during enable
        clk: tegra: Do not disable PLLE when under hardware control
        clk: tegra: Fix pllx dyn step calculation
        clk: tegra: pll: Fix potential sleeping-while-atomic
        clk: tegra: Fix the misnaming of nvenc from msenc
        clk: tegra: Fix naming of MISC registers
        clk: tango4: rename ARCH_TANGOX to ARCH_TANGO
        clk: scpi: Fix checking return value of platform_device_register_simple()
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · a703f42d
      Linus Torvalds authored
      Pull more drm fixes from Dave Airlie:
       "Some more fixes trickled in:
        A bunch of VC4 ones since it's a pretty new driver not much chance of
        regressions, and it fixes GPU resets.
        Also one atomic fix, one set of fixes for a common bug in TTM cleanup,
        and one i915 hotplug fix"
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
        drm/nouveau: use post-decrement in error handling
        drm/atomic: Allow for holes in connector state, v2.
        drm/i915: Fix hpd live status bits for g4x
        drm/vc4: Use runtime PM to power cycle the device when the GPU hangs.
        drm/vc4: Enable runtime PM.
        drm/vc4: Fix spurious GPU resets due to BO reuse.
        drm/vc4: Drop error message on seqno wait timeouts.
        drm/vc4: Fix -ERESTARTSYS error return from BO waits.
        drm/vc4: Return an ERR_PTR from BO creation instead of NULL.
        drm/vc4: Fix the clear color for the first tile rendered.
        drm/vc4: Validate that WAIT_BO padding is cleared.
        drm/radeon: use post-decrement in error handling
        drm/amdgpu: use post-decrement in error handling
    • Simon Guinot's avatar
      kernel/resource.c: fix muxed resource handling in __request_region() · 59ceeaaf
      Simon Guinot authored
      In __request_region, if a conflict with a BUSY and MUXED resource is
      detected, then the caller goes to sleep and waits for the resource to be
      released.  A pointer on the conflicting resource is kept.  At wake-up
      this pointer is used as a parent to retry to request the region.
      A first problem is that this pointer might well be invalid (if for
      example the conflicting resource have already been freed).  Another
      problem is that the next call to __request_region() fails to detect a
      remaining conflict.  The previously conflicting resource is passed as a
      parameter and __request_region() will look for a conflict among the
      children of this resource and not at the resource itself.  It is likely
      to succeed anyway, even if there is still a conflict.
      Instead, the parent of the conflicting resource should be passed to
      As a fix, this patch doesn't update the parent resource pointer in the
      case we have to wait for a muxed region right after.
      Reported-and-tested-by: default avatarVincent Pelletier <plr.vincent@gmail.com>
      Signed-off-by: default avatarSimon Guinot <simon.guinot@sequanux.org>
      Tested-by: default avatarVincent Donnefort <vdonnefort@gmail.com>
      Cc: stable@kernel.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
  4. 19 Feb, 2016 17 commits
    • Linus Torvalds's avatar
      Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · 020ecbba
      Linus Torvalds authored
      Pull ext4 bugfixes from Ted Ts'o:
       "Miscellaneous ext4 bug fixes for v4.5"
      * tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
        ext4: fix crashes in dioread_nolock mode
        ext4: fix bh->b_state corruption
        ext4: fix memleak in ext4_readdir()
        ext4: remove unused parameter "newblock" in convert_initialized_extent()
        ext4: don't read blocks from disk after extents being swapped
        ext4: fix potential integer overflow
        ext4: add a line break for proc mb_groups display
        ext4: ioctl: fix erroneous return value
        ext4: fix scheduling in atomic on group checksum failure
        ext4 crypto: move context consistency check to ext4_file_open()
        ext4 crypto: revalidate dentry after adding or removing the key
    • Linus Torvalds's avatar
      Merge branch 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · ce6b7143
      Linus Torvalds authored
      Pull btrfs fix from Chris Mason:
       "My for-linus-4.5 branch has a btrfs DIO error passing fix.
        I know how much you love DIO, so I'm going to suggest against reading
        it.  We'll follow up with a patch to drop the error arg from
        dio_end_io in the next merge window."
      * 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
        Btrfs: fix direct IO requests not reporting IO error to user space
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 87d9ac71
      Linus Torvalds authored
      Merge fixes from Andrew Morton:
       "10 fixes"
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        mm: slab: free kmem_cache_node after destroy sysfs file
        ipc/shm: handle removed segments gracefully in shm_mmap()
        MAINTAINERS: update Kselftest Framework mailing list
        devm_memremap_release(): fix memremap'd addr handling
        mm/hugetlb.c: fix incorrect proc nr_hugepages value
        mm, x86: fix pte_page() crash in gup_pte_range()
        fsnotify: turn fsnotify reaper thread into a workqueue job
        Revert "fsnotify: destroy marks with call_srcu instead of dedicated thread"
        mm: fix regression in remap_file_pages() emulation
        thp, dax: do not try to withdraw pgtable from non-anon VMA
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · 23300f65
      Linus Torvalds authored
      Pull arm64 fixes from Will Deacon:
       "Here are some more arm64 fixes for 4.5.  This has mostly come from
        Yang Shi, who saw some issues under -rt that also affect mainline.
        The rest of it is pretty small, but still worth having.
        We've got an old issue outstanding with valid_user_regs which will
        likely wait until 4.6 (since it would really benefit from some time in
        -next) and another issue with kasan and idle which should be fixed
        next week.
        Apart from that, pretty quiet here (and still no sign of the THP issue
        reported on s390...)
         - Allow EFI stub to use strnlen(), which is required by recent libfdt
         - Avoid smp_processor_id() in preempt context during unwinding
         - Avoid false Kasan warnings during unwinding
         - Ensure early devices are picked up by the IOMMU DMA ops
         - Avoid rebuilding the kernel for the 'install' target
         - Run fixup handlers for alignment faults on userspace access"
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: mm: allow the kernel to handle alignment faults on user accesses
        arm64: kbuild: make "make install" not depend on vmlinux
        arm64: dma-mapping: fix handling of devices registered before arch_initcall
        arm64/efi: Make strnlen() available to the EFI namespace
        arm/arm64: crypto: assure that ECB modes don't require an IV
        arm64: make irq_stack_ptr more robust
        arm64: debug: re-enable irqs before sending breakpoint SIGTRAP
        arm64: disable kasan when accessing frame->fp in unwind_frame
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux · ff5f1682
      Linus Torvalds authored
      Pull s390 fixes from Martin Schwidefsky:
       "Several bug fixes:
         - There are four different stack tracers, and three of them have
           bugs.  For 4.5 the bugs are fixed and we prepare a cleanup patch
           for the next merge window.
         - Three bug fixes for the dasd driver in regard to parallel access
           volumes and the new max_dev_sectors block device queue limit
         - The irq restore optimization needs a fixup for memcpy_real
         - The diagnose trace code has a conflict with lockdep"
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
        s390/dasd: fix performance drop
        s390/maccess: reduce stnsm instructions
        s390/diag: avoid lockdep recursion
        s390/dasd: fix refcount for PAV reassignment
        s390/dasd: prevent incorrect length error under z/VM after PAV changes
        s390: fix DAT off memory access, e.g. on kdump
        s390/oprofile: fix address range for asynchronous stack
        s390/perf_event: fix address range for asynchronous stack
        s390/stacktrace: add save_stack_trace_regs()
        s390/stacktrace: save full stack traces
        s390/stacktrace: add missing end marker
        s390/stacktrace: fix address ranges for asynchronous and panic stack
        s390/stacktrace: fix save_stack_trace_tsk() for current task
    • Linus Torvalds's avatar
      Merge tag 'pinctrl-v4.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl · 409ee136
      Linus Torvalds authored
      Pull Pin control fixes from Linus Walleij:
       "Pin control fixes for the v4.5 series, all are individual driver
         - Fix the PXA2xx driver to export its init function so we do not
           break modular compiles.
         - Hide unused functions in the Nomadik driver.
         - Fix up direction control in the Mediatek driver.
         - Toggle the sunxi GPIO lines to input when you read them on the H3
           GPIO controller, lest you only get garbage.
         - Fix up the number of settings in the MVEBU driver.
         - Fix a serious SMP race condition in the Samsung driver"
      * tag 'pinctrl-v4.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
        pinctrl: samsung: fix SMP race condition
        pinctrl: mvebu: fix num_settings in mpp group assignment
        pinctrl: sunxi: H3 requires irq_read_needs_mux
        pinctrl: mediatek: fix direction control issue
        pinctrl: nomadik: hide unused functions
        pinctrl: pxa: export pxa2xx_pinctrl_init()
    • Linus Torvalds's avatar
      Merge tag 'sound-4.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · 9001b8e4
      Linus Torvalds authored
      Pull sound fixes from Takashi Iwai:
       "This update contains again a few more fixes for ALSA core stuff
        although it's no longer high flux: two race fixes in sequencer and one
        PCM race fix for non-atomic PCM ops.
        In addition, HD-audio gained a similar fix for race at reloading the
      * tag 'sound-4.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: pcm: Fix rwsem deadlock for non-atomic PCM stream
        ALSA: seq: Fix double port list deletion
        ALSA: hda - Cancel probe work instead of flush at remove
        ALSA: seq: Fix leak of pool buffer at concurrent writes
    • EunTaik Lee's avatar
      arm64: mm: allow the kernel to handle alignment faults on user accesses · 52d7523d
      EunTaik Lee authored
      Although we don't expect to take alignment faults on access to normal
      memory, misbehaving (i.e. buggy) user code can pass MMIO pointers into
      system calls, leading to things like get_user accessing device memory.
      Rather than OOPS the kernel, allow any exception fixups to run and
      return something like -EFAULT back to userspace. This makes the
      behaviour more consistent with userspace, even though applications with
      access to device mappings can easily cause other issues if they try
      hard enough.
      Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarEun Taik Lee <eun.taik.lee@samsung.com>
      [will: dropped __kprobes annotation and rewrote commit mesage]
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
    • Masahiro Yamada's avatar
      arm64: kbuild: make "make install" not depend on vmlinux · 8684fa3e
      Masahiro Yamada authored
      For the same reason as commit 19514fc6
       ("arm, kbuild: make "make
      install" not depend on vmlinux"), the install targets should never
      trigger the rebuild of the kernel.
      Signed-off-by: Masahiro Yamada's avatarMasahiro Yamada <yamada.masahiro@socionext.com>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
    • Jan Kara's avatar
      ext4: fix crashes in dioread_nolock mode · 74dae427
      Jan Kara authored
      Competing overwrite DIO in dioread_nolock mode will just overwrite
      pointer to io_end in the inode. This may result in data corruption or
      extent conversion happening from IO completion interrupt because we
      don't properly set buffer_defer_completion() when unlocked DIO races
      with locked DIO to unwritten extent.
      Since unlocked DIO doesn't need io_end for anything, just avoid
      allocating it and corrupting pointer from inode for locked DIO.
      A cleaner fix would be to avoid these games with io_end pointer from the
      inode but that requires more intrusive changes so we leave that for
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    • Jan Kara's avatar
      ext4: fix bh->b_state corruption · ed8ad838
      Jan Kara authored
      ext4 can update bh->b_state non-atomically in _ext4_get_block() and
      ext4_da_get_block_prep(). Usually this is fine since bh is just a
      temporary storage for mapping information on stack but in some cases it
      can be fully living bh attached to a page. In such case non-atomic
      update of bh->b_state can race with an atomic update which then gets
      lost. Usually when we are mapping bh and thus updating bh->b_state
      non-atomically, nobody else touches the bh and so things work out fine
      but there is one case to especially worry about: ext4_finish_bio() uses
      BH_Uptodate_Lock on the first bh in the page to synchronize handling of
      PageWriteback state. So when blocksize < pagesize, we can be atomically
      modifying bh->b_state of a buffer that actually isn't under IO and thus
      can race e.g. with delalloc trying to map that buffer. The result is
      that we can mistakenly set / clear BH_Uptodate_Lock bit resulting in the
      corruption of PageWriteback state or missed unlock of BH_Uptodate_Lock.
      Fix the problem by always updating bh->b_state bits atomically.
      CC: stable@vger.kernel.org
      Reported-by: default avatarNikolay Borisov <kernel@kyup.com>
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    • Rasmus Villemoes's avatar
      drm/nouveau: use post-decrement in error handling · 4fbbed46
      Rasmus Villemoes authored
      We need to use post-decrement to get the dma_map_page undone also for
      i==0, and to avoid some very unpleasant behaviour if dma_map_page
      failed already at i==0.
      Signed-off-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
      Reviewed-by: default avatarBen Skeggs <bskeggs@redhat.com>
      Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    • Maarten Lankhorst's avatar
      drm/atomic: Allow for holes in connector state, v2. · 5fff80bb
      Maarten Lankhorst authored
      Because we record connector_mask using 1 << drm_connector_index now
      the connector_mask should stay the same even when other connectors
      are removed. This was not the case with MST, in that case when removing
      a connector all other connectors may change their index.
      This is fixed by waiting until the first get_connector_state to allocate
      connector_state, and force reallocation when state is too small.
      As a side effect connector arrays no longer have to be preallocated,
      and can be allocated on first use which means a less allocations in
      the page flip only path.
      Changes since v1:
      - Whitespace. (Ville)
      - Call ida_remove when destroying the connector. (Ville)
      - u32 alloc -> int. (Ville)
      Fixes: 14de6c44
       ("drm/atomic: Remove drm_atomic_connectors_for_crtc.")
      Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
      Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
      Reviewed-by: default avatarLyude <cpaul@redhat.com>
      Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
      Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    • Stephen Boyd's avatar
      clk: gpio: Really allow an optional clock= DT property · 4462b4bb
      Stephen Boyd authored
      We mis-merged the original patch from Russell here and so the
      patch went almost all the way, except that we still failed to
      probe when there wasn't a clocks property in the DT node. Allow
      that case by making a negative value from
      of_clk_get_parent_count() into "no parents", like the original
      patch did.
      Fixes: 7ed88aa2
       ("clk: fix clk-gpio.c with optional clock= DT property")
      Cc: Russell King <rmk+kernel@arm.linux.org.uk>
      Cc: Michael Turquette <mturquette@baylibre.com>
      Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
    • Dave Airlie's avatar
      Merge tag 'drm-vc4-fixes-2016-02-17' of github.com:anholt/linux into drm-fixes · 5441ea11
      Dave Airlie authored
      This pull request fixes GPU reset (which was disabled shortly after
      V3D integration due to build breakage) and waits for idle in the
      presence of signals (which X likes to do a lot).
      * tag 'drm-vc4-fixes-2016-02-17' of github.com:anholt/linux:
        drm/vc4: Use runtime PM to power cycle the device when the GPU hangs.
        drm/vc4: Enable runtime PM.
        drm/vc4: Fix spurious GPU resets due to BO reuse.
        drm/vc4: Drop error message on seqno wait timeouts.
        drm/vc4: Fix -ERESTARTSYS error return from BO waits.
        drm/vc4: Return an ERR_PTR from BO creation instead of NULL.
        drm/vc4: Fix the clear color for the first tile rendered.
        drm/vc4: Validate that WAIT_BO padding is cleared.
    • Dave Airlie's avatar
      Merge branch 'drm-fixes-4.5' of git://people.freedesktop.org/~agd5f/linux into drm-fixes · aaa7dd2c
      Dave Airlie authored
      Just two small fixes in the ttm_tt_populate error handling; one for radeon,
      one for amdgpu.
      * 'drm-fixes-4.5' of git://people.freedesktop.org/~agd5f/linux:
        drm/radeon: use post-decrement in error handling
        drm/amdgpu: use post-decrement in error handling
    • Dave Airlie's avatar
      Merge tag 'drm-intel-fixes-2016-02-18' of git://anongit.freedesktop.org/drm-intel into drm-fixes · 42412b12
      Dave Airlie authored
      single g4x hpd fix.
      * tag 'drm-intel-fixes-2016-02-18' of git://anongit.freedesktop.org/drm-intel:
        drm/i915: Fix hpd live status bits for g4x