1. 25 Nov, 2015 14 commits
  2. 24 Nov, 2015 14 commits
    • Jens Axboe's avatar
      block: clarify blk_add_timer() use case for blk-mq · 3b627a3f
      Jens Axboe authored
      Just a comment update on not needing queue_lock, and that we aren't
      really adding the request to a timeout list for !mq.
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      3b627a3f
    • Geliang Tang's avatar
      bio: use offset_in_page macro · bd5cecea
      Geliang Tang authored
      Use offset_in_page macro instead of (addr & ~PAGE_MASK).
      Signed-off-by: default avatarGeliang Tang <geliangtang@163.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      bd5cecea
    • Wei Tang's avatar
      block: do not initialise statics to 0 or NULL · 1fe8f348
      Wei Tang authored
      This patch fixes the checkpatch.pl error to genhd.c:
      
      ERROR: do not initialise statics to 0 or NULL
      Signed-off-by: default avatarWei Tang <tangwei@cmss.chinamobile.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      1fe8f348
    • Wei Tang's avatar
      block: do not initialise globals to 0 or NULL · d674d414
      Wei Tang authored
      This patch fixes the checkpatch.pl error to blk-exec.c:
      
      ERROR: do not initialise globals to 0 or NULL
      Signed-off-by: default avatarWei Tang <tangwei@cmss.chinamobile.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      d674d414
    • Ilya Dryomov's avatar
      block: rename request_queue slab cache · c2789bd4
      Ilya Dryomov authored
      Name the cache after the actual name of the struct.
      Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      c2789bd4
    • Christoph Hellwig's avatar
      block: fix blk_abort_request for blk-mq drivers · 55ce0da1
      Christoph Hellwig authored
      We only added the request to the request list for the !blk-mq case,
      so we should only delete it in that case as well.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      55ce0da1
    • Christoph Hellwig's avatar
      nvme: add missing unmaps in nvme_queue_rq · bf508e91
      Christoph Hellwig authored
      When we fail various metadata related operations in nvme_queue_rq we
      need to unmap the data SGL.
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      bf508e91
    • Nishanth Aravamudan's avatar
      NVMe: default to 4k device page size · c5c9f25b
      Nishanth Aravamudan authored
      We received a bug report recently when DDW (64-bit direct DMA on Power)
      is not enabled for NVMe devices. In that case, we fall back to 32-bit
      DMA via the IOMMU, which is always done via 4K TCEs (Translation Control
      Entries).
      
      The NVMe device driver, though, assumes that the DMA alignment for the
      PRP entries will match the device's page size, and that the DMA aligment
      matches the kernel's page aligment. On Power, the the IOMMU page size,
      as mentioned above, can be 4K, while the device can have a page size of
      8K, while the kernel has a page size of 64K. This eventually trips the
      BUG_ON in nvme_setup_prps(), as we have a 'dma_len' that is a multiple
      of 4K but not 8K (e.g., 0xF000).
      
      In this particular case of page sizes, we clearly want to use the
      IOMMU's page size in the driver. And generally, the NVMe driver in this
      function should be using the IOMMU's page size for the default device
      page size, rather than the kernel's page size. There is not currently an
      API to obtain the IOMMU's page size across all architectures and in the
      interest of a stop-gap fix to this functional issue, default the NVMe
      device page size to 4K, with the intent of adding such an API and
      implementation across all architectures in the next merge window.
      
      With the functionally equivalent v3 of this patch, our hardware test
      exerciser survives when using 32-bit DMA; without the patch, the kernel
      will BUG within a few minutes.
      
      Signed-off-by: Nishanth Aravamudan <nacc at linux.vnet.ibm.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      c5c9f25b
    • Linus Torvalds's avatar
      Merge tag 'dm-4.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm · 6ffeba96
      Linus Torvalds authored
      Pull device mapper fixes from Mike Snitzer:
       "Two fixes for 4.4-rc1's DM ioctl changes that introduced the potential
        for infinite recursion on ioctl (with DM multipath).
      
        And four stable fixes:
      
         - A DM thin-provisioning fix to restore 'error_if_no_space' setting
           when a thin-pool is made writable again (after having been out of
           space).
      
         - A DM thin-provisioning fix to properly advertise discard support
           for thin volumes that are stacked on a thin-pool whose underlying
           data device doesn't support discards.
      
         - A DM ioctl fix to allow ctrl-c to break out of an ioctl retry loop
           when DM multipath is configured to 'queue_if_no_path'.
      
         - A DM crypt fix for a possible hang on dm-crypt device removal"
      
      * tag 'dm-4.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
        dm thin: fix regression in advertised discard limits
        dm crypt: fix a possible hang due to race condition on exit
        dm mpath: fix infinite recursion in ioctl when no paths and !queue_if_no_path
        dm: do not reuse dm_blk_ioctl block_device input as local variable
        dm: fix ioctl retry termination with signal
        dm thin: restore requested 'error_if_no_space' setting on OODS to WRITE transition
      6ffeba96
    • Eric Dumazet's avatar
      pidns: fix NULL dereference in __task_pid_nr_ns() · 81b1a832
      Eric Dumazet authored
      I got a crash during a "perf top" session that was caused by a race in
      __task_pid_nr_ns() :
      
      pid_nr_ns() was inlined, but apparently compiler chose to read
      task->pids[type].pid twice, and the pid->level dereference crashed
      because we got a NULL pointer at the second read :
      
          if (pid && ns->level <= pid->level) { // CRASH
      
      Just use RCU API properly to solve this race, and not worry about "perf
      top" crashing hosts :(
      
      get_task_pid() can benefit from same fix.
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      81b1a832
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 4ce01c51
      Linus Torvalds authored
      Pull block layer fixes from Jens Axboe:
       "A round of fixes/updates for the current series.
      
        This looks a little bigger than it is, but that's mainly because we
        pushed the lightnvm enabled null_blk change out of the merge window so
        it could be updated a bit.  The rest of the volume is also mostly
        lightnvm.  In particular:
      
         - Lightnvm.  Various fixes, additions, updates from Matias and
           Javier, as well as from Wenwei Tao.
      
         - NVMe:
              - Fix for potential arithmetic overflow from Keith.
              - Also from Keith, ensure that we reap pending completions from
                a completion queue before deleting it.  Fixes kernel crashes
                when resetting a device with IO pending.
              - Various little lightnvm related tweaks from Matias.
      
         - Fixup flushes to go through the IO scheduler, for the cases where a
           flush is not required.  Fixes a case in CFQ where we would be
           idling and not see this request, hence not break the idling.  From
           Jan Kara.
      
         - Use list_{first,prev,next} in elevator.c for cleaner code.  From
           Gelian Tang.
      
         - Fix for a warning trigger on btrfs and raid on single queue blk-mq
           devices, where we would flush plug callbacks with preemption
           disabled.  From me.
      
         - A mac partition validation fix from Kees Cook.
      
         - Two merge fixes from Ming, marked stable.  A third part is adding a
           new warning so we'll notice this quicker in the future, if we screw
           up the accounting.
      
         - Cleanup of thread name/creation in mtip32xx from Rasmus Villemoes"
      
      * 'for-linus' of git://git.kernel.dk/linux-block: (32 commits)
        blk-merge: warn if figured out segment number is bigger than nr_phys_segments
        blk-merge: fix blk_bio_segment_split
        block: fix segment split
        blk-mq: fix calling unplug callbacks with preempt disabled
        mac: validate mac_partition is within sector
        mtip32xx: use formatting capability of kthread_create_on_node
        NVMe: reap completion entries when deleting queue
        lightnvm: add free and bad lun info to show luns
        lightnvm: keep track of block counts
        nvme: lightnvm: use admin queues for admin cmds
        lightnvm: missing free on init error
        lightnvm: wrong return value and redundant free
        null_blk: do not del gendisk with lightnvm
        null_blk: use device addressing mode
        null_blk: use ppa_cache pool
        NVMe: Fix possible arithmetic overflow for max segments
        blk-flush: Queue through IO scheduler when flush not required
        null_blk: register as a LightNVM device
        elevator: use list_{first,prev,next}_entry
        lightnvm: cleanup queue before target removal
        ...
      4ce01c51
    • Ming Lei's avatar
      blk-merge: warn if figured out segment number is bigger than nr_phys_segments · 12e57f59
      Ming Lei authored
      We had seen lots of reports of this kind issue, so add one
      warnning in blk-merge, then it can be triggered easily and
      avoid to depend on warning/bug from drivers.
      Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      12e57f59
    • Ming Lei's avatar
      blk-merge: fix blk_bio_segment_split · 02e70742
      Ming Lei authored
      Commit bdced438(block: setup bi_phys_segments after
      splitting) introduces function of computing bio->bi_phys_segments
      during bio splitting.
      
      Unfortunately both bio->bi_seg_front_size and bio->bi_seg_back_size
      arn't computed, so too many physical segments may be obtained
      for one request since both the two are used to check if one segment
      across two bios can be possible.
      
      This patch fixes the issue by computing the two variables in
      blk_bio_segment_split().
      
      Fixes: bdced438(block: setup bi_phys_segments after splitting)
      Reported-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      Reported-by: default avatarMark Salter <msalter@redhat.com>
      Tested-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
      Tested-by: default avatarMark Salter <msalter@redhat.com>
      Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      02e70742
    • Ming Lei's avatar
      block: fix segment split · 578270bf
      Ming Lei authored
      Inside blk_bio_segment_split(), previous bvec pointer(bvprvp)
      always points to the iterator local variable, which is obviously
      wrong, so fix it by pointing to the local variable of 'bvprv'.
      
      Fixes: 5014c311(block: fix bogus compiler warnings in blk-merge.c)
      Cc: stable@kernel.org #4.3
      Reported-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      Reported-by: default avatarMark Salter <msalter@redhat.com>
      Tested-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
      Tested-by: default avatarMark Salter <msalter@redhat.com>
      Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      578270bf
  3. 23 Nov, 2015 3 commits
    • Linus Torvalds's avatar
      Merge tag 'linux-kselftest-4.4-rc3' of... · a2931547
      Linus Torvalds authored
      Merge tag 'linux-kselftest-4.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
      
      Pull kselftest fixes from Shuah Khan:
       "This update consists of one minor documentation fix and a fix to an
        existing test"
      
      * tag 'linux-kselftest-4.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
        selftests/seccomp: Get page size from sysconf
        tools:testing/selftests: fix typo in futex/README
      a2931547
    • Mike Snitzer's avatar
      dm thin: fix regression in advertised discard limits · 0fcb04d5
      Mike Snitzer authored
      When establishing a thin device's discard limits we cannot rely on the
      underlying thin-pool device's discard capabilities (which are inherited
      from the thin-pool's underlying data device) given that DM thin devices
      must provide discard support even when the thin-pool's underlying data
      device doesn't support discards.
      
      Users were exposed to this thin device discard limits regression if
      their thin-pool's underlying data device does _not_ support discards.
      This regression caused all upper-layers that called the
      blkdev_issue_discard() interface to not be able to issue discards to
      thin devices (because discard_granularity was 0).  This regression
      wasn't caught earlier because the device-mapper-test-suite's extensive
      'thin-provisioning' discard tests are only ever performed against
      thin-pool's with data devices that support discards.
      
      Fix is to have thin_io_hints() test the pool's 'discard_enabled' feature
      rather than inferring whether or not a thin device's discard support
      should be enabled by looking at the thin-pool's discard_granularity.
      
      Fixes: 21607670 ("dm thin: disable discard support for thin devices if pool's is disabled")
      Reported-by: default avatarMike Gerber <mike@sprachgewalt.de>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Cc: stable@vger.kernel.org # 4.1+
      0fcb04d5
    • Linus Torvalds's avatar
      Linux 4.4-rc2 · 1ec21837
      Linus Torvalds authored
      1ec21837
  4. 22 Nov, 2015 9 commits
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 104e2a6f
      Linus Torvalds authored
      Merge slub bulk allocator updates from Andrew Morton:
       "This missed the merge window because I was waiting for some repairs to
        come in.  Nothing actually uses the bulk allocator yet and the changes
        to other code paths are pretty small.  And the net guys are waiting
        for this so they can start merging the client code"
      
      More comments from Jesper Dangaard Brouer:
       "The kmem_cache_alloc_bulk() call, in mm/slub.c, were included in
        previous kernel.  The present version contains a bug.  Vladimir
        Davydov noticed it contained a bug, when kernel is compiled with
        CONFIG_MEMCG_KMEM (see commit 03ec0ed5: "slub: fix kmem cgroup
        bug in kmem_cache_alloc_bulk").  Plus the mem cgroup counterpart in
        kmem_cache_free_bulk() were missing (see commit 03374518 "slub:
        add missing kmem cgroup support to kmem_cache_free_bulk").
      
        I don't consider the fix stable-material because there are no in-tree
        users of the API.
      
        But with known bugs (for memcg) I cannot start using the API in the
        net-tree"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        slab/slub: adjust kmem_cache_alloc_bulk API
        slub: add missing kmem cgroup support to kmem_cache_free_bulk
        slub: fix kmem cgroup bug in kmem_cache_alloc_bulk
        slub: optimize bulk slowpath free by detached freelist
        slub: support for bulk free with SLUB freelists
      104e2a6f
    • Linus Torvalds's avatar
      Merge tag 'tty-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty · dcfeda9d
      Linus Torvalds authored
      Pull tty/serial fixes from Greg KH:
       "Here are a few small tty/serial driver fixes for 4.4-rc2 that resolve
        some reported problems.
      
        All have been in linux-next, full details are in the shortlog below"
      
      * tag 'tty-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
        serial: export fsl8250_handle_irq
        serial: 8250_mid: Add missing dependency
        tty: audit: Fix audit source
        serial: etraxfs-uart: Fix crash
        serial: fsl_lpuart: Fix earlycon support
        bcm63xx_uart: Use the device name when registering an interrupt
        tty: Fix direct use of tty buffer work
        tty: Fix tty_send_xchar() lock order inversion
      dcfeda9d
    • Linus Torvalds's avatar
      Merge tag 'staging-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · 7f217393
      Linus Torvalds authored
      Pull staging/IIO fixes from Greg KH:
       "Here are some staging and iio driver fixes for 4.4-rc2.  All of these
        are in response to issues that have been reported and have been in
        linux-next for a while"
      
      * tag 'staging-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
        Revert "Staging: wilc1000: coreconfigurator: Drop unneeded wrapper functions"
        iio: adc: xilinx: Fix VREFN scale
        iio: si7020: Swap data byte order
        iio: adc: vf610_adc: Fix division by zero error
        iio:ad7793: Fix ad7785 product ID
        iio: ad5064: Fix ad5629/ad5669 shift
        iio:ad5064: Make sure ad5064_i2c_write() returns 0 on success
        iio: lpc32xx_adc: fix warnings caused by enabling unprepared clock
        staging: iio: select IRQ_WORK for IIO_DUMMY_EVGEN
        vf610_adc: Fix internal temperature calculation
      7f217393
    • Linus Torvalds's avatar
      Merge tag 'usb-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · 6d2d91b3
      Linus Torvalds authored
      Pull USB fixes from Greg KH:
       "Here are a number of USB fixes and new device ids for 4.4-rc2.  All
        have been in linux-next and the details are in the shortlog"
      
      * tag 'usb-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (28 commits)
        usblp: do not set TASK_INTERRUPTIBLE before lock
        USB: MAINTAINERS: cxacru
        usb: kconfig: fix warning of select USB_OTG
        USB: option: add XS Stick W100-2 from 4G Systems
        xhci: Fix a race in usb2 LPM resume, blocking U3 for usb2 devices
        usb: xhci: fix checking ep busy for CFC
        xhci: Workaround to get Intel xHCI reset working more reliably
        usb: chipidea: imx: fix a possible NULL dereference
        usb: chipidea: usbmisc_imx: fix a possible NULL dereference
        usb: chipidea: otg: gadget module load and unload support
        usb: chipidea: debug: disable usb irq while role switch
        ARM: dts: imx27.dtsi: change the clock information for usb
        usb: chipidea: imx: refine clock operations to adapt for all platforms
        usb: gadget: atmel_usba_udc: Expose correct device speed
        usb: musb: enable usb_dma parameter
        usb: phy: phy-mxs-usb: fix a possible NULL dereference
        usb: dwc3: gadget: let us set lower max_speed
        usb: musb: fix tx fifo flush handling
        usb: gadget: f_loopback: fix the warning during the enumeration
        usb: dwc2: host: Fix remote wakeup when not in DWC2_L2
        ...
      6d2d91b3
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 0ec7dc8d
      Linus Torvalds authored
      Pull MIPS fixes from Ralf Baechle:
      
       - Fix a flood of annoying build warnings
      
       - A number of fixes for Atheros 79xx platforms
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: ath79: Add a machine entry for booting OF machines
        MIPS: ath79: Fix the size of the MISC INTC registers in ar9132.dtsi
        MIPS: ath79: Fix the DDR control initialization on ar71xx and ar934x
        MIPS: Fix flood of warnings about comparsion being always true.
      0ec7dc8d
    • Linus Torvalds's avatar
      Merge branch 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · 94521b2f
      Linus Torvalds authored
      Pull parisc update from Helge Deller:
       "This patchset adds Huge Page and HUGETLBFS support for parisc"
      
      Honestly, the hugepage support should have gone through in the merge
      window, and is not really an rc-time fix.  But it only touches
      arch/parisc, and I cannot find it in myself to care.  If one of the
      three parisc users notices a breakage, I will point at Helge and make
      rude farting noises.
      
      * 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
        parisc: Map kernel text and data on huge pages
        parisc: Add Huge Page and HUGETLBFS support
        parisc: Use long branch to do_syscall_trace_exit
        parisc: Increase initial kernel mapping to 32MB on 64bit kernel
        parisc: Initialize the fault vector earlier in the boot process.
        parisc: Add defines for Huge page support
        parisc: Drop unused MADV_xxxK_PAGES flags from asm/mman.h
        parisc: Drop definition of start_thread_som for HP-UX SOM binaries
        parisc: Fix wrong comment regarding first pmd entry flags
      94521b2f
    • Linus Torvalds's avatar
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 727cde6c
      Linus Torvalds authored
      Pull perf tool fixes from Thomas Gleixner:
       "A couple of fixes for perf tools:
      
         - Build system updates
      
         - Plug a memory leak in an error path of perf probe
      
         - Tear down probes correctly when adding fails
      
         - Fixes to the perf symbol handling
      
         - Fix ordering of event processing in buildid-list
      
         - Fix per DSO filtering in the histogram browser"
      
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        perf probe: Clear probe_trace_event when add_probe_trace_event() fails
        perf probe: Fix memory leaking on failure by clearing all probe_trace_events
        perf inject: Also re-pipe lost_samples event
        perf buildid-list: Requires ordered events
        perf symbols: Fix dso lookup by long name and missing buildids
        perf symbols: Allow forcing reading of non-root owned files by root
        perf hists browser: The dso can be obtained from popup_action->ms.map->dso
        perf hists browser: Fix 'd' hotkey action to filter by DSO
        perf symbols: Rebuild rbtree when adjusting symbols for kcore
        tools: Add a "make all" rule
        tools: Actually install tmon in the install rule
      727cde6c
    • Linus Torvalds's avatar
      Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 069ec229
      Linus Torvalds authored
      Pull x86 fixes from Thomas Gleixner:
       "This update contains:
      
         - MPX updates for handling 32bit processes
      
         - A fix for a long standing bug in 32bit signal frame handling
           related to FPU/XSAVE state
      
         - Handle get_xsave_addr() correctly in KVM
      
         - Fix SMAP check under paravirtualization
      
         - Add a comment to the static function trace entry to avoid further
           confusion about the difference to dynamic tracing"
      
      * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/cpu: Fix SMAP check in PVOPS environments
        x86/ftrace: Add comment on static function tracing
        x86/fpu: Fix get_xsave_addr() behavior under virtualization
        x86/fpu: Fix 32-bit signal frame handling
        x86/mpx: Fix 32-bit address space calculation
        x86/mpx: Do proper get_user() when running 32-bit binaries on 64-bit kernels
      069ec229
    • Jesper Dangaard Brouer's avatar
      slab/slub: adjust kmem_cache_alloc_bulk API · 865762a8
      Jesper Dangaard Brouer authored
      Adjust kmem_cache_alloc_bulk API before we have any real users.
      
      Adjust API to return type 'int' instead of previously type 'bool'.  This
      is done to allow future extension of the bulk alloc API.
      
      A future extension could be to allow SLUB to stop at a page boundary, when
      specified by a flag, and then return the number of objects.
      
      The advantage of this approach, would make it easier to make bulk alloc
      run without local IRQs disabled.  With an approach of cmpxchg "stealing"
      the entire c->freelist or page->freelist.  To avoid overshooting we would
      stop processing at a slab-page boundary.  Else we always end up returning
      some objects at the cost of another cmpxchg.
      
      To keep compatible with future users of this API linking against an older
      kernel when using the new flag, we need to return the number of allocated
      objects with this API change.
      Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
      Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
      Acked-by: default avatarChristoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      865762a8