1. 09 Apr, 2017 6 commits
    • Linus Torvalds's avatar
      Linux 4.11-rc6 · 39da7c50
      Linus Torvalds authored
      39da7c50
    • Linus Torvalds's avatar
      Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 · 84ced7fd
      Linus Torvalds authored
      Pull CIFS fixes from Steve French:
       "This is a set of CIFS/SMB3 fixes for stable.
      
        There is another set of four SMB3 reconnect fixes for stable in
        progress but they are still being reviewed/tested, so didn't want to
        wait any longer to send these five below"
      
      * 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
        Reset TreeId to zero on SMB2 TREE_CONNECT
        CIFS: Fix build failure with smb2
        Introduce cifs_copy_file_range()
        SMB3: Rename clone_range to copychunk_range
        Handle mismatched open calls
      84ced7fd
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm · 462e9a35
      Linus Torvalds authored
      Pull ARM fixes from Russell King:
       "A number of ARM fixes:
      
         - prevent oopses caused by dma_get_sgtable() and declared DMA
           coherent memory
      
         - fix boot failure on nommu caused by ID_PFR1 access
      
         - a number of kprobes fixes from Jon Medhurst and Masami Hiramatsu"
      
      * 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
        ARM: 8665/1: nommu: access ID_PFR1 only if CPUID scheme
        ARM: dma-mapping: disallow dma_get_sgtable() for non-kernel managed memory
        arm: kprobes: Align stack to 8-bytes in test code
        arm: kprobes: Fix the return address of multiple kretprobes
        arm: kprobes: Skip single-stepping in recursing path if possible
        arm: kprobes: Allow to handle reentered kprobe on single-stepping
      462e9a35
    • Linus Torvalds's avatar
      Merge tag 'driver-core-4.11-rc6' of... · 5b50be74
      Linus Torvalds authored
      Merge tag 'driver-core-4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
      
      Pull driver core fixes from Greg KH:
       "Here are 3 small fixes for 4.11-rc6.
      
        One resolves a reported issue with sysfs files that NeilBrown found,
        one is a documenatation fix for the stable kernel rules, and the last
        is a small MAINTAINERS file update for kernfs"
      
      * tag 'driver-core-4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
        MAINTAINERS: separate out kernfs maintainership
        sysfs: be careful of error returns from ops->show()
        Documentation: stable-kernel-rules: fix stable-tag format
      5b50be74
    • Linus Torvalds's avatar
      Merge tag 'staging-4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · 62e1fd08
      Linus Torvalds authored
      Pull staging/IIO driver rfixes from Greg KH:
       "Here are a number of small IIO and staging driver fixes for 4.11-rc6.
        Nothing big here, just iio fixes for reported issues, and an ashmem
        fix for a very old bug that has been reported by a number of Android
        vendors"
      
      * tag 'staging-4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
        staging: android: ashmem: lseek failed due to no FMODE_LSEEK.
        iio: hid-sensor-attributes: Fix sensor property setting failure.
        iio: accel: hid-sensor-accel-3d: Fix duplicate scan index error
        iio: core: Fix IIO_VAL_FRACTIONAL_LOG2 for negative values
        iio: st_pressure: initialize lps22hb bootime
        iio: bmg160: reset chip when probing
        iio: cros_ec_sensors: Fix return value to get raw and calibbias data.
      62e1fd08
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 2a610b8a
      Linus Torvalds authored
      Pull VFS fixes from Al Viro:
       "statx followup fixes and a fix for stack-smashing on alpha"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        alpha: fix stack smashing in old_adjtimex(2)
        statx: Include a mask for stx_attributes in struct statx
        statx: Reserve the top bit of the mask for future struct expansion
        xfs: report crtime and attribute flags to statx
        ext4: Add statx support
        statx: optimize copy of struct statx to userspace
        statx: remove incorrect part of vfs_statx() comment
        statx: reject unknown flags when using NULL path
        Documentation/filesystems: fix documentation for ->getattr()
      2a610b8a
  2. 08 Apr, 2017 23 commits
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 78d91a75
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
       "Here's a pull request for 4.11-rc, fixing a set of issues mostly
        centered around the new scheduling framework. These have been brewing
        for a while, but split up into what we absolutely need in 4.11, and
        what we can defer until 4.12. These are well tested, on both single
        queue and multiqueue setups, and with and without shared tags. They
        fix several hangs that have happened in testing.
      
        This is obviously larger than I would have preferred at this point in
        time, but I don't think we can shave much off this and still get the
        desired results.
      
        In detail, this pull request contains:
      
         - a set of five fixes for NVMe, mostly from Christoph and one from
           Roland.
      
         - a series from Bart, fixing issues with dm-mq and SCSI shared tags
           and scheduling. Note that one of those patches commit messages may
           read like an optimization, but it is in fact an important fix for
           queue restarts in particular.
      
         - a series from Omar, most importantly fixing a hang with multiple
           hardware queues when we fail to get a driver tag. Another important
           fix in there is for resizing hardware queues, which nbd does when
           handling multiple sockets for one connection.
      
         - fixing an imbalance in putting the ctx for hctx request allocations
           from Minchan"
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        blk-mq: Restart a single queue if tag sets are shared
        dm rq: Avoid that request processing stalls sporadically
        scsi: Avoid that SCSI queues get stuck
        blk-mq: Introduce blk_mq_delay_run_hw_queue()
        blk-mq: remap queues when adding/removing hardware queues
        blk-mq-sched: fix crash in switch error path
        blk-mq-sched: set up scheduler tags when bringing up new queues
        blk-mq-sched: refactor scheduler initialization
        blk-mq: use the right hctx when getting a driver tag fails
        nvmet: fix byte swap in nvmet_parse_io_cmd
        nvmet: fix byte swap in nvmet_execute_write_zeroes
        nvmet: add missing byte swap in nvmet_get_smart_log
        nvme: add missing byte swap in nvme_setup_discard
        nvme: Correct NVMF enum values to match NVMe-oF rev 1.0
        block: do not put mq context in blk_mq_alloc_request_hctx
      78d91a75
    • Linus Torvalds's avatar
      Merge tag 'pinctrl-v4.11-4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl · c3df1c7c
      Linus Torvalds authored
      Pull pin control fix from Linus Walleij:
       "This late fix for pin control is hopefully the last I send this cycle.
      
        The problem was detected early in the v4.11 release cycle and there
        has been some back and forth on how to solve it. Sadly the proper fix
        arrives late, but at least not too late.
      
        An issue was detected with pin control on the Freescale i.MX after the
        refactorings for more general group and function handling.
      
        We now have the proper fix for this"
      
      * tag 'pinctrl-v4.11-4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
        pinctrl: core: Fix pinctrl_register_and_init() with pinctrl_enable()
      c3df1c7c
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.11-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 894ca30c
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Some more powerpc fixes for 4.11:
      
        Headed to stable:
      
         - disable HFSCR[TM] if TM is not supported, fixes a potential host
           kernel crash triggered by a hostile guest, but only in
           configurations that no one uses
      
         - don't try to fix up misaligned load-with-reservation instructions
      
         - fix flush_(d|i)cache_range() called from modules on little endian
           kernels
      
         - add missing global TLB invalidate if cxl is active
      
         - fix missing preempt_disable() in crc32c-vpmsum
      
        And a fix for selftests build changes that went in this release:
      
         - selftests/powerpc: Fix standalone powerpc build
      
        Thanks to: Benjamin Herrenschmidt, Frederic Barrat, Oliver O'Halloran,
        Paul Mackerras"
      
      * tag 'powerpc-4.11-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/crypto/crc32c-vpmsum: Fix missing preempt_disable()
        powerpc/mm: Add missing global TLB invalidate if cxl is active
        powerpc/64: Fix flush_(d|i)cache_range() called from modules
        powerpc: Don't try to fix up misaligned load-with-reservation instructions
        powerpc: Disable HFSCR[TM] if TM is not supported
        selftests/powerpc: Fix standalone powerpc build
      894ca30c
    • Chris Salls's avatar
      mm/mempolicy.c: fix error handling in set_mempolicy and mbind. · cf01fb99
      Chris Salls authored
      
      
      In the case that compat_get_bitmap fails we do not want to copy the
      bitmap to the user as it will contain uninitialized stack data and leak
      sensitive data.
      Signed-off-by: default avatarChris Salls <salls@cs.ucsb.edu>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cf01fb99
    • Liping Zhang's avatar
      sysctl: report EINVAL if value is larger than UINT_MAX for proc_douintvec · 425fffd8
      Liping Zhang authored
      Currently, inputting the following command will succeed but actually the
      value will be truncated:
      
        # echo 0x12ffffffff > /proc/sys/net/ipv4/tcp_notsent_lowat
      
      This is not friendly to the user, so instead, we should report error
      when the value is larger than UINT_MAX.
      
      Fixes: e7d316a0
      
       ("sysctl: handle error writing UINT_MAX to u32 fields")
      Signed-off-by: default avatarLiping Zhang <zlpnobody@gmail.com>
      Cc: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Eric W. Biederman <ebiederm@xmission.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      425fffd8
    • Tejun Heo's avatar
      MAINTAINERS: separate out kernfs maintainership · 27f395b8
      Tejun Heo authored
      
      
      Separate out kernfs from driver core and add myself as a
      co-maintainer.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      27f395b8
    • NeilBrown's avatar
      sysfs: be careful of error returns from ops->show() · c8a139d0
      NeilBrown authored
      ops->show() can return a negative error code.
      Commit 65da3484 ("sysfs: correctly handle short reads on PREALLOC attrs.")
      (in v4.4) caused this to be stored in an unsigned 'size_t' variable, so errors
      would look like large numbers.
      As a result, if an error is returned, sysfs_kf_read() will return the
      value of 'count', typically 4096.
      
      Commit 17d0774f ("sysfs: correctly handle read offset on PREALLOC attrs")
      (in v4.8) extended this error to use the unsigned large 'len' as a size for
      memmove().
      Consequently, if ->show returns an error, then the first read() on the
      sysfs file will return 4096 and could return uninitialized memory to
      user-space.
      If the application performs a subsequent read, this will trigger a memmove()
      with extremely large count, and is likely to crash the machine is bizarre ways.
      
      This bug can currently only be triggered by reading from an md
      sysfs attribute declared with __ATTR_PREALLOC() during the
      brief period between when mddev_put() deletes an mddev from
      the ->all_mddevs list, and when mddev_delayed_delete() - which is
      scheduled on a workqueue - completes.
      Before this, an error won't be returned by the ->show()
      After this, the ->show() won't be called.
      
      I can reproduce it reliably only by putting delay like
      	usleep_range(500000,700000);
      early in mddev_delayed_delete(). Then after creating an
      md device md0 run
        echo clear > /sys/block/md0/md/array_state; cat /sys/block/md0/md/array_state
      
      The bug can be triggered without the usleep.
      
      Fixes: 65da3484 ("sysfs: correctly handle short reads on PREALLOC attrs.")
      Fixes: 17d0774f
      
       ("sysfs: correctly handle read offset on PREALLOC attrs")
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarNeilBrown <neilb@suse.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Reported-and-tested-by: default avatarMiroslav Benes <mbenes@suse.cz>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      c8a139d0
    • Johan Hovold's avatar
      Documentation: stable-kernel-rules: fix stable-tag format · cf903e9d
      Johan Hovold authored
      A patch documenting how to specify which kernels a particular fix should
      be backported to (seemingly) inadvertently added a minus sign after the
      kernel version. This particular stable-tag format had never been used
      prior to this patch, and was neither present when the patch in question
      was first submitted (it was added in v2 without any comment).
      
      Drop the minus sign to avoid any confusion.
      
      Fixes: fdc81b79
      
       ("stable_kernel_rules: Add clause about specification of kernel versions to patch.")
      Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      cf903e9d
    • Shuxiao Zhang's avatar
      staging: android: ashmem: lseek failed due to no FMODE_LSEEK. · 97fbfef6
      Shuxiao Zhang authored
      vfs_llseek will check whether the file mode has
      FMODE_LSEEK, no return failure. But ashmem can be
      lseek, so add FMODE_LSEEK to ashmem file.
      
      Comment From Greg Hackmann:
      	ashmem_llseek() passes the llseek() call through to the backing
      	shmem file.  91360b02 ("ashmem: use vfs_llseek()") changed
      	this from directly calling the file's llseek() op into a VFS
      	layer call.  This also adds a check for the FMODE_LSEEK bit, so
      	without that bit ashmem_llseek() now always fails with -ESPIPE.
      
      Fixes: 91360b02
      
       ("ashmem: use vfs_llseek()")
      Signed-off-by: default avatarShuxiao Zhang <zhangshuxiao@xiaomi.com>
      Tested-by: default avatarGreg Hackmann <ghackmann@google.com>
      Cc: stable <stable@vger.kernel.org> # 3.18+
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      97fbfef6
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc · 8b65bb57
      Linus Torvalds authored
      Pull sparc fixes from David Miller:
       "Several fixes here, mostly having to due with either build errors or
        memory corruptions depending upon whether you have THP enabled or not"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
        sparc: remove unused wp_works_ok macro
        sparc32: Export vac_cache_size to fix build error
        sparc64: Fix memory corruption when THP is enabled
        sparc64: Fix kernel panic due to erroneous #ifdef surrounding pmd_write()
        arch/sparc: Avoid DCTI Couples
        sparc64: kern_addr_valid regression
        sparc64: Add support for 2G hugepages
        sparc64: Fix size check in huge_pte_alloc
      8b65bb57
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 542380a2
      Linus Torvalds authored
      Pull KVM fixes from Radim Krčmář:
       "ARM:
         - Fix a problem with GICv3 userspace save/restore
         - Clarify GICv2 userspace save/restore ABI
         - Be more careful in clearing GIC LRs
         - Add missing synchronization primitive to our MMU handling code
      
        PPC:
         - Check for a NULL return from kzalloc
      
        s390:
         - Prevent translation exception errors on valid page tables for the
           instruction-exection-protection support
      
        x86:
         - Fix Page-Modification Logging when running a nested guest"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        KVM: PPC: Book3S HV: Check for kmalloc errors in ioctl
        KVM: nVMX: initialize PML fields in vmcs02
        KVM: nVMX: do not leak PML full vmexit to L1
        KVM: arm/arm64: vgic: Fix GICC_PMR uaccess on GICv3 and clarify ABI
        KVM: arm64: Ensure LRs are clear when they should be
        kvm: arm/arm64: Fix locking for kvm_free_stage2_pgd
        KVM: s390: remove change-recording override support
        arm/arm64: KVM: Take mmap_sem in kvm_arch_prepare_memory_region
        arm/arm64: KVM: Take mmap_sem in stage2_unmap_vm
      542380a2
    • Linus Torvalds's avatar
      Merge branch 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit · 62fedca5
      Linus Torvalds authored
      Pull audit cleanup from Paul Moore:
       "A week later than I had hoped, but as promised, here is the audit
        uninline-fix we talked about during the last audit pull request.
      
        The patch is slightly different than what we originally discussed as
        it made more sense to keep the audit_signal_info() function in
        auditsc.c rather than move it and bunch of other related
        variables/definitions into audit.c/audit.h.
      
        At some point in the future I need to look at how the audit code is
        organized across kernel/audit*, I suspect we could do things a bit
        better, but it doesn't seem like a -rc release is a good place for
        that ;)
      
        Regardless, this patch passes our tests without problem and looks good
        for v4.11"
      
      * 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit:
        audit: move audit_signal_info() into kernel/auditsc.c
      62fedca5
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 56c29979
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "10 fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        mm: move pcp and lru-pcp draining into single wq
        mailmap: update Yakir Yang email address
        mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff()
        dax: fix radix tree insertion race
        mm, thp: fix setting of defer+madvise thp defrag mode
        ptrace: fix PTRACE_LISTEN race corrupting task->state
        vmlinux.lds: add missing VMLINUX_SYMBOL macros
        mm/page_alloc.c: fix print order in show_free_areas()
        userfaultfd: report actual registered features in fdinfo
        mm: fix page_vma_mapped_walk() for ksm pages
      56c29979
    • Michal Hocko's avatar
      mm: move pcp and lru-pcp draining into single wq · ce612879
      Michal Hocko authored
      We currently have 2 specific WQ_RECLAIM workqueues in the mm code.
      vmstat_wq for updating pcp stats and lru_add_drain_wq dedicated to drain
      per cpu lru caches.  This seems more than necessary because both can run
      on a single WQ.  Both do not block on locks requiring a memory
      allocation nor perform any allocations themselves.  We will save one
      rescuer thread this way.
      
      On the other hand drain_all_pages() queues work on the system wq which
      doesn't have rescuer and so this depend on memory allocation (when all
      workers are stuck allocating and new ones cannot be created).
      
      Initially we thought this would be more of a theoretical problem but
      Hugh Dickins has reported:
      
      : 4.11-rc has been giving me hangs after hours of swapping load.  At
      : first they looked like memory leaks ("fork: Cannot allocate memory");
      : but for no good reason I happened to do "cat /proc/sys/vm/stat_refresh"
      : before looking at /proc/meminfo one time, and the stat_refresh stuck
      : in D state, waiting for completion of flush_work like many kworkers.
      : kthreadd waiting for completion of flush_work in drain_all_pages().
      
      This worker should be using WQ_RECLAIM as well in order to guarantee a
      forward progress.  We can reuse the same one as for lru draining and
      vmstat.
      
      Link: http://lkml.kernel.org/r/20170307131751.24936-1-mhocko@kernel.org
      
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
      Suggested-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Acked-by: default avatarMel Gorman <mgorman@suse.de>
      Tested-by: default avatarYang Li <pku.leo@gmail.com>
      Tested-by: default avatarHugh Dickins <hughd@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ce612879
    • Jeffy Chen's avatar
      mailmap: update Yakir Yang email address · cdcf4330
      Jeffy Chen authored
      Set current email address to replace previous employers email addresses.
      
      Link: http://lkml.kernel.org/r/1491450722-6633-1-git-send-email-jeffy.chen@rock-chips.com
      
      Signed-off-by: default avatarJeffy Chen <jeffy.chen@rock-chips.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cdcf4330
    • David Rientjes's avatar
      mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff() · 460bcec8
      David Rientjes authored
      We got need_resched() warnings in swap_cgroup_swapoff() because
      swap_cgroup_ctrl[type].length is particularly large.
      
      Reschedule when needed.
      
      Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1704061315270.80559@chino.kir.corp.google.com
      
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
      Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      460bcec8
    • Ross Zwisler's avatar
      dax: fix radix tree insertion race · e11f8b7b
      Ross Zwisler authored
      While running generic/340 in my test setup I hit the following race.  It
      can happen with kernels that support FS DAX PMDs, so v4.10 thru
      v4.11-rc5.
      
      Thread 1				Thread 2
      --------				--------
      dax_iomap_pmd_fault()
        grab_mapping_entry()
          spin_lock_irq()
          get_unlocked_mapping_entry()
          'entry' is NULL, can't call lock_slot()
          spin_unlock_irq()
          radix_tree_preload()
      					dax_iomap_pmd_fault()
      					  grab_mapping_entry()
      					    spin_lock_irq()
      					    get_unlocked_mapping_entry()
      					    ...
      					    lock_slot()
      					    spin_unlock_irq()
      					  dax_pmd_insert_mapping()
      					    <inserts a PMD mapping>
          spin_lock_irq()
          __radix_tree_insert() fails with -EEXIST
          <fall back to 4k fault, and die horribly
           when inserting a 4k entry where a PMD exists>
      
      The issue is that we have to drop mapping->tree_lock while calling
      radix_tree_preload(), but since we didn't have a radix tree entry to
      lock (unlike in the pmd_downgrade case) we have no protection against
      Thread 2 coming along and inserting a PMD at the same index.  For 4k
      entries we handled this with a special-case response to -EEXIST coming
      from the __radix_tree_insert(), but this doesn't save us for PMDs
      because the -EEXIST case can also mean that we collided with a 4k entry
      in the radix tree at a different index, but one that is covered by our
      PMD range.
      
      So, correctly handle both the 4k and 2M collision cases by explicitly
      re-checking the radix tree for an entry at our index once we reacquire
      mapping->tree_lock.
      
      This patch has made it through a clean xfstests run with the current
      v4.11-rc5 based linux/master, and it also ran generic/340 500 times in a
      loop.  It used to fail within the first 10 iterations.
      
      Link: http://lkml.kernel.org/r/20170406212944.2866-1-ross.zwisler@linux.intel.com
      
      Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
      Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Jan Kara <jack@suse.cz>
      Cc: Matthew Wilcox <mawilcox@microsoft.com>
      Cc: <stable@vger.kernel.org>    [4.10+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e11f8b7b
    • David Rientjes's avatar
      mm, thp: fix setting of defer+madvise thp defrag mode · 4fad7fb6
      David Rientjes authored
      Setting thp defrag mode of "defer+madvise" actually sets "defer" in the
      kernel due to the name similarity and the out-of-order way the string is
      checked in defrag_store().
      
      Check the string in the correct order so that
      TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG is set appropriately for
      "defer+madvise".
      
      Fixes: 21440d7e ("mm, thp: add new defer+madvise defrag option")
      Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1704051814420.137626@chino.kir.corp.google.com
      
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.com>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: Mel Gorman <mgorman@techsingularity.net>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4fad7fb6
    • bsegall@google.com's avatar
      ptrace: fix PTRACE_LISTEN race corrupting task->state · 5402e97a
      bsegall@google.com authored
      In PT_SEIZED + LISTEN mode STOP/CONT signals cause a wakeup against
      __TASK_TRACED.  If this races with the ptrace_unfreeze_traced at the end
      of a PTRACE_LISTEN, this can wake the task /after/ the check against
      __TASK_TRACED, but before the reset of state to TASK_TRACED.  This
      causes it to instead clobber TASK_WAKING, allowing a subsequent wakeup
      against TRACED while the task is still on the rq wake_list, corrupting
      it.
      
      Oleg said:
       "The kernel can crash or this can lead to other hard-to-debug problems.
        In short, "task->state = TASK_TRACED" in ptrace_unfreeze_traced()
        assumes that nobody else can wake it up, but PTRACE_LISTEN breaks the
        contract. Obviusly it is very wrong to manipulate task->state if this
        task is already running, or WAKING, or it sleeps again"
      
      [akpm@linux-foundation.org: coding-style fixes]
      Fixes: 9899d11f ("ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL")
      Link: http://lkml.kernel.org/r/xm26y3vfhmkp.fsf_-_@bsegall-linux.mtv.corp.google.com
      
      Signed-off-by: default avatarBen Segall <bsegall@google.com>
      Acked-by: default avatarOleg Nesterov <oleg@redhat.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5402e97a
    • Jessica Yu's avatar
      vmlinux.lds: add missing VMLINUX_SYMBOL macros · d79bf21e
      Jessica Yu authored
      When __{start,end}_ro_after_init is referenced from C code, we run into
      the following build errors on blackfin:
      
        kernel/extable.c:169: undefined reference to `__start_ro_after_init'
        kernel/extable.c:169: undefined reference to `__end_ro_after_init'
      
      The build error is due to the fact that blackfin is one of the few
      arches that prepends an underscore '_' to all symbols defined in C.
      
      Fix this by wrapping __{start,end}_ro_after_init in vmlinux.lds.h with
      VMLINUX_SYMBOL(), which adds the necessary prefix for arches that have
      HAVE_UNDERSCORE_SYMBOL_PREFIX.
      
      Link: http://lkml.kernel.org/r/1491259387-15869-1-git-send-email-jeyu@redhat.com
      
      Signed-off-by: default avatarJessica Yu <jeyu@redhat.com>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Eddie Kovsky <ewk@edkovsky.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d79bf21e
    • Alexander Polakov's avatar
      mm/page_alloc.c: fix print order in show_free_areas() · 1f06b81a
      Alexander Polakov authored
      Fixes: 11fb9989 ("mm: move most file-based accounting to the node")
      Link: http://lkml.kernel.org/r/1490377730.30219.2.camel@beget.ru
      
      Signed-off-by: default avatarAlexander Polyakov <apolyakov@beget.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.com>
      Cc: Mel Gorman <mgorman@techsingularity.net>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: <stable@vger.kernel.org>	[4.8+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1f06b81a
    • Mike Rapoport's avatar
      userfaultfd: report actual registered features in fdinfo · 045098e9
      Mike Rapoport authored
      fdinfo for userfault file descriptor reports UFFD_API_FEATURES.  Up
      until recently, the UFFD_API_FEATURES was defined as 0, therefore
      corresponding field in fdinfo always contained zero.  Now, with
      introduction of several additional features, UFFD_API_FEATURES is not
      longer 0 and it seems better to report actual features requested for the
      userfaultfd object described by the fdinfo.
      
      First, the applications that were using userfault will still see zero at
      the features field in fdinfo.  Next, reporting actual features rather
      than available features, gives clear indication of what userfault
      features are used by an application.
      
      Link: http://lkml.kernel.org/r/1491140181-22121-1-git-send-email-rppt@linux.vnet.ibm.com
      
      Signed-off-by: default avatarMike Rapoport <rppt@linux.vnet.ibm.com>
      Reviewed-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
      Cc: Pavel Emelyanov <xemul@virtuozzo.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      045098e9
    • Hugh Dickins's avatar
      mm: fix page_vma_mapped_walk() for ksm pages · d75450ff
      Hugh Dickins authored
      Doug Smythies reports oops with KSM in this backtrace, I've been seeing
      the same:
      
        page_vma_mapped_walk+0xe6/0x5b0
        page_referenced_one+0x91/0x1a0
        rmap_walk_ksm+0x100/0x190
        rmap_walk+0x4f/0x60
        page_referenced+0x149/0x170
        shrink_active_list+0x1c2/0x430
        shrink_node_memcg+0x67a/0x7a0
        shrink_node+0xe1/0x320
        kswapd+0x34b/0x720
      
      Just as observed in commit 4b0ece6f ("mm: migrate: fix
      remove_migration_pte() for ksm pages"), you cannot use page->index
      calculations on ksm pages.
      
      page_vma_mapped_walk() is relying on __vma_address(), where a ksm page
      can lead it off the end of the page table, and into whatever nonsense is
      in the next page, ending as an oops inside check_pte()'s pte_page().
      
      KSM tells page_vma_mapped_walk() exactly where to look for the page, it
      does not need any page->index calculation: and that's so also for all
      the normal and file and anon pages - just not for THPs and their
      subpages.  Get out early in most cases: instead of a PageKsm test, move
      down the earlier not-THP-page test, as suggested by Kirill.
      
      I'm also slightly worried that this loop can stray into other vmas, so
      added a vm_end test to prevent surprises; though I have not imagined
      anything worse than a very contrived case, in which a page mlocked in
      the next vma might be reclaimed because it is not mlocked in this vma.
      
      Fixes: ace71a19 ("mm: introduce page_vma_mapped_walk()")
      Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1704031104400.1118@eggly.anvils
      
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Reported-by: default avatarDoug Smythies <dsmythies@telus.net>
      Tested-by: default avatarDoug Smythies <dsmythies@telus.net>
      Reviewed-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d75450ff
  3. 07 Apr, 2017 11 commits
    • Martin Brandenburg's avatar
      orangefs: move features validation to fix filesystem hang · cefdc26e
      Martin Brandenburg authored
      Without this fix (and another to the userspace component itself
      described later), the kernel will be unable to process any OrangeFS
      requests after the userspace component is restarted (due to a crash or
      at the administrator's behest).
      
      The bug here is that inside orangefs_remount, the orangefs_request_mutex
      is locked.  When the userspace component restarts while the filesystem
      is mounted, it sends a ORANGEFS_DEV_REMOUNT_ALL ioctl to the device,
      which causes the kernel to send it a few requests aimed at synchronizing
      the state between the two.  While this is happening the
      orangefs_request_mutex is locked to prevent any other requests going
      through.
      
      This is only half of the bugfix.  The other half is in the userspace
      component which outright ignores(!) requests made before it considers
      the filesystem remounted, which is after the ioctl returns.  Of course
      the ioctl doesn't return until after the userspace component responds to
      the request it ignores.  The userspace component has been changed to
      allow ORANGEFS_VFS_OP_FEATURES regardless of the mount status.
      
      Mike Marshall says:
       "I've tested this patch against the fixed userspace part. This patch is
        real important, I hope it can make it into 4.11...
      
        Here's what happens when the userspace daemon is restarted, without
        the patch:
      
          =============================================
          [ INFO: possible recursive locking detected ]
          [   4.10.0-00007-ge98bdb30 #1 Not tainted    ]
          ---------------------------------------------
          pvfs2-client-co/29032 is trying to acquire lock:
           (orangefs_request_mutex){+.+.+.}, at: service_operation+0x3c7/0x7b0 [orangefs]
                        but task is already holding lock:
           (orangefs_request_mutex){+.+.+.}, at: dispatch_ioctl_command+0x1bf/0x330 [orangefs]
      
          CPU: 0 PID: 29032 Comm: pvfs2-client-co Not tainted 4.10.0-00007-ge98bdb30
      
       #1
          Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-1.fc25 04/01/2014
          Call Trace:
           __lock_acquire+0x7eb/0x1290
           lock_acquire+0xe8/0x1d0
           mutex_lock_killable_nested+0x6f/0x6e0
           service_operation+0x3c7/0x7b0 [orangefs]
           orangefs_remount+0xea/0x150 [orangefs]
           dispatch_ioctl_command+0x227/0x330 [orangefs]
           orangefs_devreq_ioctl+0x29/0x70 [orangefs]
           do_vfs_ioctl+0xa3/0x6e0
           SyS_ioctl+0x79/0x90"
      Signed-off-by: default avatarMartin Brandenburg <martin@omnibond.com>
      Acked-by: default avatarMike Marshall <hubcap@omnibond.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cefdc26e
    • Linus Torvalds's avatar
      Merge tag 'pci-v4.11-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci · c2eb7bea
      Linus Torvalds authored
      Pull PCI fixes from Bjorn Helgaas:
      
       - fix ThunderX legacy firmware resources
      
       - fix ARTPEC-6 and DesignWare platform driver NULL pointer dereferences
      
       - fix HiSilicon link error
      
      * tag 'pci-v4.11-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
        PCI: dwc: Fix dw_pcie_ops NULL pointer dereference
        PCI: dwc: Select PCI_HOST_COMMON for hisi
        PCI: thunder-pem: Fix legacy firmware PEM-specific resources
      c2eb7bea
    • Bart Van Assche's avatar
      blk-mq: Restart a single queue if tag sets are shared · 6d8c6c0f
      Bart Van Assche authored
      
      
      To improve scalability, if hardware queues are shared, restart
      a single hardware queue in round-robin fashion. Rename
      blk_mq_sched_restart_queues() to reflect the new semantics.
      Remove blk_mq_sched_mark_restart_queue() because this function
      has no callers. Remove flag QUEUE_FLAG_RESTART because this
      patch removes the code that uses this flag.
      Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Hannes Reinecke <hare@suse.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      6d8c6c0f
    • Bart Van Assche's avatar
      dm rq: Avoid that request processing stalls sporadically · 6077c2d7
      Bart Van Assche authored
      
      
      While running the srp-test software I noticed that request
      processing stalls sporadically at the beginning of a test, namely
      when mkfs is run against a dm-mpath device. Every time when that
      happened the following command was sufficient to resume request
      processing:
      
          echo run >/sys/kernel/debug/block/dm-0/state
      
      This patch avoids that such request processing stalls occur. The
      test I ran is as follows:
      
          while srp-test/run_tests -d -r 30 -t 02-mq; do :; done
      Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
      Cc: Mike Snitzer <snitzer@redhat.com>
      Cc: dm-devel@redhat.com
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      6077c2d7
    • Bart Van Assche's avatar
      scsi: Avoid that SCSI queues get stuck · 36e3cf27
      Bart Van Assche authored
      If a .queue_rq() function returns BLK_MQ_RQ_QUEUE_BUSY then the block
      driver that implements that function is responsible for rerunning the
      hardware queue once requests can be queued again successfully.
      
      commit 52d7f1b5 ("blk-mq: Avoid that requeueing starts stopped
      queues") removed the blk_mq_stop_hw_queue() call from scsi_queue_rq()
      for the BLK_MQ_RQ_QUEUE_BUSY case. Hence change all calls to functions
      that are intended to rerun a busy queue such that these examine all
      hardware queues instead of only stopped queues.
      
      Since no other functions than scsi_internal_device_block() and
      scsi_internal_device_unblock() should ever stop or restart a SCSI
      queue, change the blk_mq_delay_queue() call into a
      blk_mq_delay_run_hw_queue() call.
      
      Fixes: commit 52d7f1b5 ("blk-mq: Avoid that requeueing starts stopped queues")
      Fixes: commit 7e79dadc
      
       ("blk-mq: stop hardware queue in blk_mq_delay_queue()")
      Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
      Cc: Martin K. Petersen <martin.petersen@oracle.com>
      Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Hannes Reinecke <hare@suse.de>
      Cc: Sagi Grimberg <sagi@grimberg.me>
      Cc: Long Li <longli@microsoft.com>
      Cc: K. Y. Srinivasan <kys@microsoft.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      36e3cf27
    • Bart Van Assche's avatar
      blk-mq: Introduce blk_mq_delay_run_hw_queue() · 7587a5ae
      Bart Van Assche authored
      
      
      Introduce a function that runs a hardware queue unconditionally
      after a delay. Note: there is already a function that stops and
      restarts a hardware queue after a delay, namely blk_mq_delay_queue().
      
      This function will be used in the next patch in this series.
      Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Hannes Reinecke <hare@suse.de>
      Cc: Long Li <longli@microsoft.com>
      Cc: K. Y. Srinivasan <kys@microsoft.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      7587a5ae
    • Linus Torvalds's avatar
      Merge tag 'dm-4.11-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm · 81d4bab4
      Linus Torvalds authored
      Pull device mapper fixes from Mike Snitzer:
      
       - two stable fixes for the verity target's FEC support
      
       - a stable fix for raid target's raid1 support (when no bitmap is used)
      
       - a 4.11 cache metadata v2 format fix to properly test blocks are clean
      
      * tag 'dm-4.11-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
        dm verity fec: fix bufio leaks
        dm raid: fix NULL pointer dereference for raid1 without bitmap
        dm cache metadata: fix metadata2 format's blocks_are_clean_separate_dirty
        dm verity fec: limit error correction recursion
      81d4bab4
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · dc25ad3f
      Linus Torvalds authored
      Pull arm64 fixes from Will Deacon:
       "We've got a regression fix for the signal raised when userspace makes
        an unsupported unaligned access and a revert of the contiguous
        (hugepte) support for hugetlb, which has once again been found to be
        broken. One day, maybe, we'll get it right.
      
        Summary:
      
         - restore previous SIGBUS behaviour for unhandled unaligned user
           accesses
      
         - revert broken support for the contiguous bit in hugetlb (again...)"
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        Revert "Revert "arm64: hugetlb: partial revert of 66b3923a""
        arm64: mm: unaligned access by user-land should be received as SIGBUS
      dc25ad3f
    • Linus Torvalds's avatar
      Merge tag 'metag-for-v4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag · 4f0d14b0
      Linus Torvalds authored
      Pull metag usercopy fixes from James Hogan:
       "Metag usercopy fault handling fixes
      
        These patches fix a bunch of longstanding (some over a decade old)
        metag user copy fault handling bugs. Thanks go to Al Viro for spotting
        some of the questionable code in the first place"
      
      * tag 'metag-for-v4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag:
        metag/usercopy: Add missing fixups
        metag/usercopy: Fix src fixup in from user rapf loops
        metag/usercopy: Set flags before ADDZ
        metag/usercopy: Zero rest of buffer from copy_from_user
        metag/usercopy: Add early abort to copy_to_user
        metag/usercopy: Fix alignment error checking
        metag/usercopy: Drop unused macros
      4f0d14b0
    • Linus Torvalds's avatar
      Merge tag 'acpi-4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 7ab66185
      Linus Torvalds authored
      Pull ACPI fix from Rafael Wysocki:
       "This fixes a core device enumeration code change made in 4.10, in
        order to address a reported issue, that went too far.
      
        Specifics:
      
         - Refine the check for the existence of _HID in find_child_checks()
           so that it doesn't trigger for device objects with device IDs made
           up by the kernel (Rafael Wysocki)"
      
      * tag 'acpi-4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        ACPI / scan: Prefer devices without _HID for _ADR matching
      7ab66185
    • Linus Torvalds's avatar
      Merge tag 'for-linus-4.11b-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip · 50bdd7a0
      Linus Torvalds authored
      Pull Xen fix from Juergen Gross:
       "A fix for error path cleanup in the xenbus handler"
      
      * tag 'for-linus-4.11b-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
        xenbus: remove transaction holder from list before freeing
      50bdd7a0