1. 31 Mar, 2016 7 commits
    • Yuyang Du's avatar
      sched/fair: Initiate a new task's util avg to a bounded value · 2b8c41da
      Yuyang Du authored
      A new task's util_avg is set to full utilization of a CPU (100% time
      running). This accelerates a new task's utilization ramp-up, useful to
      boost its execution in early time. However, it may result in
      (insanely) high utilization for a transient time period when a flood
      of tasks are spawned. Importantly, it violates the "fundamentally
      bounded" CPU utilization, and its side effect is negative if we don't
      take any measure to bound it.
      
      This patch proposes an algorithm to address this issue. It has
      two methods to approach a sensible initial util_avg:
      
      (1) An expected (or average) util_avg based on its cfs_rq's util_avg:
      
        util_avg = cfs_rq->util_avg / (cfs_rq->load_avg + 1) * se.load.weight
      
      (2) A trajectory of how successive new tasks' util develops, which
      gives 1/2 of the left utilization budget to a new task such that
      the additional util is noticeably large (when overall util is low) or
      unnoticeably small (when overall util is high enough). In the meantime,
      the aggregate utilization is well bounded:
      
        util_avg_cap = (1024 - cfs_rq->avg.util_avg) / 2^n
      
      where n denotes the nth task.
      
      If util_avg is larger than util_avg_cap, then the effective util is
      clamped to the util_avg_cap.
      Reported-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
      Signed-off-by: default avatarYuyang Du <yuyang.du@intel.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: bsegall@google.com
      Cc: morten.rasmussen@arm.com
      Cc: pjt@google.com
      Cc: steve.muckle@linaro.org
      Link: http://lkml.kernel.org/r/1459283456-21682-1-git-send-email-yuyang.du@intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      2b8c41da
    • Yuyang Du's avatar
      sched/fair: Update comments after a variable rename · 1c3de5e1
      Yuyang Du authored
      The following commit:
      
        ed82b8a1 ("sched/core: Move the sched_to_prio[] arrays out of line")
      
      renamed prio_to_weight to sched_prio_to_weight, but the old name was not
      updated in comments.
      Signed-off-by: default avatarYuyang Du <yuyang.du@intel.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1459292871-22531-1-git-send-email-yuyang.du@intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      1c3de5e1
    • Steven Rostedt's avatar
      sched/core: Add preempt checks in preempt_schedule() code · 47252cfb
      Steven Rostedt authored
      While testing the tracer preemptoff, I hit this strange trace:
      
         <...>-259     0...1    0us : schedule <-worker_thread
         <...>-259     0d..1    0us : rcu_note_context_switch <-__schedule
         <...>-259     0d..1    0us : rcu_sched_qs <-rcu_note_context_switch
         <...>-259     0d..1    0us : rcu_preempt_qs <-rcu_note_context_switch
         <...>-259     0d..1    0us : _raw_spin_lock <-__schedule
         <...>-259     0d..1    0us : preempt_count_add <-_raw_spin_lock
         <...>-259     0d..2    0us : do_raw_spin_lock <-_raw_spin_lock
         <...>-259     0d..2    1us : deactivate_task <-__schedule
         <...>-259     0d..2    1us : update_rq_clock.part.84 <-deactivate_task
         <...>-259     0d..2    1us : dequeue_task_fair <-deactivate_task
         <...>-259     0d..2    1us : dequeue_entity <-dequeue_task_fair
         <...>-259     0d..2    1us : update_curr <-dequeue_entity
         <...>-259     0d..2    1us : update_min_vruntime <-update_curr
         <...>-259     0d..2    1us : cpuacct_charge <-update_curr
         <...>-259     0d..2    1us : __rcu_read_lock <-cpuacct_charge
         <...>-259     0d..2    1us : __rcu_read_unlock <-cpuacct_charge
         <...>-259     0d..2    1us : clear_buddies <-dequeue_entity
         <...>-259     0d..2    1us : account_entity_dequeue <-dequeue_entity
         <...>-259     0d..2    2us : update_min_vruntime <-dequeue_entity
         <...>-259     0d..2    2us : update_cfs_shares <-dequeue_entity
         <...>-259     0d..2    2us : hrtick_update <-dequeue_task_fair
         <...>-259     0d..2    2us : wq_worker_sleeping <-__schedule
         <...>-259     0d..2    2us : kthread_data <-wq_worker_sleeping
         <...>-259     0d..2    2us : pick_next_task_fair <-__schedule
         <...>-259     0d..2    2us : check_cfs_rq_runtime <-pick_next_task_fair
         <...>-259     0d..2    2us : pick_next_entity <-pick_next_task_fair
         <...>-259     0d..2    2us : clear_buddies <-pick_next_entity
         <...>-259     0d..2    2us : pick_next_entity <-pick_next_task_fair
         <...>-259     0d..2    2us : clear_buddies <-pick_next_entity
         <...>-259     0d..2    2us : set_next_entity <-pick_next_task_fair
         <...>-259     0d..2    3us : put_prev_entity <-pick_next_task_fair
         <...>-259     0d..2    3us : check_cfs_rq_runtime <-put_prev_entity
         <...>-259     0d..2    3us : set_next_entity <-pick_next_task_fair
      gnome-sh-1031    0d..2    3us : finish_task_switch <-__schedule
      gnome-sh-1031    0d..2    3us : _raw_spin_unlock_irq <-finish_task_switch
      gnome-sh-1031    0d..2    3us : do_raw_spin_unlock <-_raw_spin_unlock_irq
      gnome-sh-1031    0...2    3us!: preempt_count_sub <-_raw_spin_unlock_irq
      gnome-sh-1031    0...1  582us : do_raw_spin_lock <-_raw_spin_lock
      gnome-sh-1031    0...1  583us : _raw_spin_unlock <-drm_gem_object_lookup
      gnome-sh-1031    0...1  583us : do_raw_spin_unlock <-_raw_spin_unlock
      gnome-sh-1031    0...1  583us : preempt_count_sub <-_raw_spin_unlock
      gnome-sh-1031    0...1  584us : _raw_spin_unlock <-drm_gem_object_lookup
      gnome-sh-1031    0...1  584us+: trace_preempt_on <-drm_gem_object_lookup
      gnome-sh-1031    0...1  603us : <stack trace>
       => preempt_count_sub
       => _raw_spin_unlock
       => drm_gem_object_lookup
       => i915_gem_madvise_ioctl
       => drm_ioctl
       => do_vfs_ioctl
       => SyS_ioctl
       => entry_SYSCALL_64_fastpath
      
      As I'm tracing preemption disabled, it seemed incorrect that the trace
      would go across a schedule and report not being in the scheduler.
      Looking into this I discovered the problem.
      
      schedule() calls preempt_disable() but the preempt_schedule() calls
      preempt_enable_notrace(). What happened above was that the gnome-shell
      task was preempted on another CPU, migrated over to the idle cpu. The
      tracer stared with idle calling schedule(), which called
      preempt_disable(), but then gnome-shell finished, and it enabled
      preemption with preempt_enable_notrace() that does stop the trace, even
      though preemption was enabled.
      
      The purpose of the preempt_disable_notrace() in the preempt_schedule()
      is to prevent function tracing from going into an infinite loop.
      Because function tracing can trace the preempt_enable/disable() calls
      that are traced. The problem with function tracing is:
      
        NEED_RESCHED set
        preempt_schedule()
          preempt_disable()
            preempt_count_inc()
              function trace (before incrementing preempt count)
                preempt_disable_notrace()
                preempt_enable_notrace()
                  sees NEED_RESCHED set
                     preempt_schedule() (repeat)
      
      Now by breaking out the preempt off/on tracing into their own code:
      preempt_disable_check() and preempt_enable_check(), we can add these to
      the preempt_schedule() code. As preemption would then be disabled, even
      if they were to be traced by the function tracer, the disabled
      preemption would prevent the recursion.
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20160321112339.6dc78ad6@gandalf.local.homeSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      47252cfb
    • Tim Chen's avatar
      sched/numa: Remove unnecessary NUMA dequeue update from non-SMP kernels · bfdb198c
      Tim Chen authored
      In account_entity_enqueue(), we do not do account_numa_enqueue()
      as NUMA balancing is not needed for UP kernels.
      
      Hence, we should remove the account_numa_dequeue() call from
      account_entity_dequeue() for UP kernels.
      Signed-off-by: default avatarTim Chen <tim.c.chen@linux.intel.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1454366879.21738.29.camel@schen9-desk2.jf.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      bfdb198c
    • Srikar Dronamraju's avatar
      sched/fair: Reset nr_balance_failed after active balancing · d02c0711
      Srikar Dronamraju authored
      To force a task migration during active balancing, nr_balance_failed is set
      to cache_nice_tries + 1. However nr_balance_failed is not reset. As a side
      effect, the next regular load balance under the same sd, a cache hot task
      might be migrated, just because nr_balance_failed count is high.
      
      Resetting nr_balance_failed after a successful active balance ensures
      that a hot task is not unreasonably migrated. This can be verified by
      looking at othe number of hot task migrations reported by /proc/schedstat.
      Signed-off-by: default avatarSrikar Dronamraju <srikar@linux.vnet.ibm.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1458735884-30105-1-git-send-email-srikar@linux.vnet.ibm.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d02c0711
    • Dongsheng Yang's avatar
      sched/cpuacct: Split usage accounting into user_usage and sys_usage · d740037f
      Dongsheng Yang authored
      Sometimes, cpuacct.usage is not detailed enough to see how much CPU
      usage a group had. We want to know how much time it used in user mode
      and how much in kernel mode.
      
      This patch introduces more files to give this information:
      
       # ls /sys/fs/cgroup/cpuacct/cpuacct.usage*
       /sys/fs/cgroup/cpuacct/cpuacct.usage
       /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu
       /sys/fs/cgroup/cpuacct/cpuacct.usage_user
       /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu_user
       /sys/fs/cgroup/cpuacct/cpuacct.usage_sys
       /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu_sys
      
      ... while keeping the ABI with the existing counter.
      Signed-off-by: default avatarDongsheng Yang <yangds.fnst@cn.fujitsu.com>
      [ Ported to newer kernels. ]
      Signed-off-by: default avatarZhao Lei <zhaolei@cn.fujitsu.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Tejun Heo <htejun@gmail.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/aa171da036b520b51c79549e9b3215d29473f19d.1458635566.git.zhaolei@cn.fujitsu.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d740037f
    • Zhao Lei's avatar
      sched/cpuacct: Show all possible CPUs in cpuacct output · 5ca3726a
      Zhao Lei authored
      Current code show stats of online CPUs in cpuacct.statcpus,
      show stats of present cpus in cpuacct.usage(_percpu), and using
      present CPUs for setting cpuacct.usage.
      
      It will cause inconsistent result when a CPU is online or offline
      or hotpluged.
      
      We should always use possible CPUs to avoid above problem.
      
      Here are the contents of a cpuacct.usage_percpu sysfs file,
      on a 4 CPU system with maxcpus=32:
      
      Before the patch:
       # cat cpuacct.usage_percpu
       2456565 411435 1052897 832584
      
      After the patch:
       # cat cpuacct.usage_percpu
       2456565 411435 1052897 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
      Suggested-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Signed-off-by: default avatarZhao Lei <zhaolei@cn.fujitsu.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Tejun Heo <htejun@gmail.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/a11d56cef12d0b4807f8be3a46bf9798c3014d59.1458635566.git.zhaolei@cn.fujitsu.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      5ca3726a
  2. 30 Mar, 2016 2 commits
  3. 29 Mar, 2016 3 commits
  4. 28 Mar, 2016 3 commits
  5. 26 Mar, 2016 15 commits
    • Linus Torvalds's avatar
      Linux 4.6-rc1 · f55532a0
      Linus Torvalds authored
      f55532a0
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client · d5a38f6e
      Linus Torvalds authored
      Pull Ceph updates from Sage Weil:
       "There is quite a bit here, including some overdue refactoring and
        cleanup on the mon_client and osd_client code from Ilya, scattered
        writeback support for CephFS and a pile of bug fixes from Zheng, and a
        few random cleanups and fixes from others"
      
      [ I already decided not to pull this because of it having been rebased
        recently, but ended up changing my mind after all.  Next time I'll
        really hold people to it.  Oh well.   - Linus ]
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (34 commits)
        libceph: use KMEM_CACHE macro
        ceph: use kmem_cache_zalloc
        rbd: use KMEM_CACHE macro
        ceph: use lookup request to revalidate dentry
        ceph: kill ceph_get_dentry_parent_inode()
        ceph: fix security xattr deadlock
        ceph: don't request vxattrs from MDS
        ceph: fix mounting same fs multiple times
        ceph: remove unnecessary NULL check
        ceph: avoid updating directory inode's i_size accidentally
        ceph: fix race during filling readdir cache
        libceph: use sizeof_footer() more
        ceph: kill ceph_empty_snapc
        ceph: fix a wrong comparison
        ceph: replace CURRENT_TIME by current_fs_time()
        ceph: scattered page writeback
        libceph: add helper that duplicates last extent operation
        libceph: enable large, variable-sized OSD requests
        libceph: osdc->req_mempool should be backed by a slab pool
        libceph: make r_request msg_size calculation clearer
        ...
      d5a38f6e
    • Linus Torvalds's avatar
      Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux · 698f415c
      Linus Torvalds authored
      Pull orangefs filesystem from Mike Marshall.
      
      This finally merges the long-pending orangefs filesystem, which has been
      much cleaned up with input from Al Viro over the last six months.  From
      the documentation file:
      
       "OrangeFS is an LGPL userspace scale-out parallel storage system.  It
        is ideal for large storage problems faced by HPC, BigData, Streaming
        Video, Genomics, Bioinformatics.
      
        Orangefs, originally called PVFS, was first developed in 1993 by Walt
        Ligon and Eric Blumer as a parallel file system for Parallel Virtual
        Machine (PVM) as part of a NASA grant to study the I/O patterns of
        parallel programs.
      
        Orangefs features include:
      
          - Distributes file data among multiple file servers
          - Supports simultaneous access by multiple clients
          - Stores file data and metadata on servers using local file system
            and access methods
          - Userspace implementation is easy to install and maintain
          - Direct MPI support
          - Stateless"
      
      see Documentation/filesystems/orangefs.txt for more in-depth details.
      
      * tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux: (174 commits)
        orangefs: fix orangefs_superblock locking
        orangefs: fix do_readv_writev() handling of error halfway through
        orangefs: have ->kill_sb() evict the VFS side of things first
        orangefs: sanitize ->llseek()
        orangefs-bufmap.h: trim unused junk
        orangefs: saner calling conventions for getting a slot
        orangefs_copy_{to,from}_bufmap(): don't pass bufmap pointer
        orangefs: get rid of readdir_handle_s
        ornagefs: ensure that truncate has an up to date inode size
        orangefs: move code which sets i_link to orangefs_inode_getattr
        orangefs: remove needless wrapper around GFP_KERNEL
        orangefs: remove wrapper around mutex_lock(&inode->i_mutex)
        orangefs: refactor inode type or link_target change detection
        orangefs: use new getattr for revalidate and remove old getattr
        orangefs: use new getattr in inode getattr and permission
        orangefs: use new orangefs_inode_getattr to get size in write and llseek
        orangefs: use new orangefs_inode_getattr to create new inodes
        orangefs: rename orangefs_inode_getattr to orangefs_inode_old_getattr
        orangefs: remove inode->i_lock wrapper
        orangefs: put register_chrdev immediately before register_filesystem
        ...
      698f415c
    • Linus Torvalds's avatar
      Merge tag 'ntb-4.6' of git://github.com/jonmason/ntb · b4cec5f6
      Linus Torvalds authored
      Pull NTB bug fixes from Jon Mason:
       "NTB bug fixes for tasklet from spinning forever, link errors,
        translation window setup, NULL ptr dereference, and ntb-perf errors.
      
        Also, a modification to the driver API that makes _addr functions
        optional"
      
      * tag 'ntb-4.6' of git://github.com/jonmason/ntb:
        NTB: Remove _addr functions from ntb_hw_amd
        NTB: Make _addr functions optional in the API
        NTB: Fix incorrect clean up routine in ntb_perf
        NTB: Fix incorrect return check in ntb_perf
        ntb: fix possible NULL dereference
        ntb: add missing setup of translation window
        ntb: stop link work when we do not have memory
        ntb: stop tasklet from spinning forever during shutdown.
        ntb: perf test: fix address space confusion
      b4cec5f6
    • Linus Torvalds's avatar
      Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · 895a1067
      Linus Torvalds authored
      Pull more SCSI updates from James Bottomley:
       "The only new stuff which missed the first pull request is an update to
        the UFS driver.
      
        The rest is an assortment of bug fixes and minor tweaks which appeared
        recently (some are fixes for recent code and some are stuff spotted
        recently by the checkers or the new gcc-6 compiler [most of Arnd's
        stuff])"
      
      * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (32 commits)
        scsi_common: do not clobber fixed sense information
        scsi: ufs: select CONFIG_NLS
        scsi: fc: use get/put_unaligned64 for wwn access
        fnic: move printk()s outside of the critical code section.
        qla2xxx: avoid maybe_uninitialized warning
        megaraid_sas: add missing curly braces in ioctl handler
        lpfc: fix misleading indentation
        scsi_transport_sas: add 'scsi_target_id' sysfs attribute
        scsi_dh_alua: uninitialized variable in alua_check_vpd()
        scsi: ufs-qcom: add printouts of testbus debug registers
        scsi: ufs-qcom: enable/disable the device ref clock
        scsi: ufs-qcom: set PA_Local_TX_LCC_Enable before link startup
        scsi: ufs: add device quirk delay before putting UFS rails in LPM
        scsi: ufs: fix leakage during link off state
        scsi: ufs: tune UniPro parameters to optimize hibern8 exit time
        scsi: ufs: handle non spec compliant bkops behaviour by device
        scsi: ufs: add retry for query descriptors
        scsi: ufs: add error recovery after DL NAC error
        scsi: ufs: make error handling bit faster
        scsi: ufs: disable vccq if it's not needed by UFS device
        ...
      895a1067
    • Linus Torvalds's avatar
      f2fs/crypto: fix xts_tweak initialization · 02fc59a0
      Linus Torvalds authored
      Commit 0b81d077 ("fs crypto: move per-file encryption from f2fs
      tree to fs/crypto") moved the f2fs crypto files to fs/crypto/ and
      renamed the symbol prefixes from "f2fs_" to "fscrypt_" (and from "F2FS_"
      to just "FS" for preprocessor symbols).
      
      Because of the symbol renaming, it's a bit hard to see it as a file
      move: use
      
          git show -M30 0b81d077
      
      to lower the rename detection to just 30% similarity and make git show
      the files as renamed (the header file won't be shown as a rename even
      then - since all it contains is symbol definitions, it looks almost
      completely different).
      
      Even with the renames showing as renames, the diffs are not all that
      easy to read, since so much is just the renames.  But Eric Biggers
      noticed that it's not just all renames: the initialization of the
      xts_tweak had been broken too, using the inode number rather than the
      page offset.
      
      That's not right - it makes the xfs_tweak the same for all pages of each
      inode.  It _might_ make sense to make the xfs_tweak contain both the
      offset _and_ the inode number, but not just the inode number.
      Reported-by: default avatarEric Biggers <ebiggers3@gmail.com>
      Cc: Jaegeuk Kim <jaegeuk@kernel.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      02fc59a0
    • Allen Hubbe's avatar
      NTB: Remove _addr functions from ntb_hw_amd · 4f1b50c3
      Allen Hubbe authored
      Kernel zero day testing warned about address space confusion.  A virtual
      iomem address was used where a physical address is expected.  The
      offending functions implement an optional part of the api, so they are
      removed.  They can be added later, after testing.
      
      Fixes: a1b36958Signed-off-by: default avatarAllen Hubbe <Allen.Hubbe@emc.com>
      Acked-by: default avatarXiangliang Yu <Xiangliang.Yu@amd.com>
      Signed-off-by: default avatarJon Mason <jdmason@kudzu.us>
      4f1b50c3
    • Al Viro's avatar
      orangefs: fix orangefs_superblock locking · 45996492
      Al Viro authored
      * switch orangefs_remount() to taking ORANGEFS_SB(sb) instead of sb
      * remove from the list _before_ orangefs_unmount() - request_mutex
      in the latter will make sure that nothing observed in the loop in
      ORANGEFS_DEV_REMOUNT_ALL handling will get freed until the end
      of loop
      * on removal, keep the forward pointer and zero the back one.  That
      way we can drop and regain the spinlock in the loop body (again,
      ORANGEFS_DEV_REMOUNT_ALL one) and still be able to get to the
      rest of the list.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
      45996492
    • Al Viro's avatar
      orangefs: fix do_readv_writev() handling of error halfway through · 6d4c1a30
      Al Viro authored
      Error should only be returned if nothing had been read/written.
      Otherwise we need to report a short read/write instead.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
      6d4c1a30
    • Al Viro's avatar
    • Al Viro's avatar
      orangefs: sanitize ->llseek() · 177f8fc4
      Al Viro authored
      a) open files can't have NULL inodes
      b) it's SEEK_END, not ORANGEFS_SEEK_END; no need to get cute.
      c) make_bad_inode() on lseek()?
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
      177f8fc4
    • Al Viro's avatar
      orangefs-bufmap.h: trim unused junk · 7df240d7
      Al Viro authored
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
      7df240d7
    • Al Viro's avatar
      orangefs: saner calling conventions for getting a slot · b8a99a8f
      Al Viro authored
      just have it return the slot number or -E... - the caller checks
      the sign anyway
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
      b8a99a8f
    • Al Viro's avatar
      orangefs_copy_{to,from}_bufmap(): don't pass bufmap pointer · bf6bf606
      Al Viro authored
      it's always __orangefs_bufmap
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
      bf6bf606
    • Al Viro's avatar
      orangefs: get rid of readdir_handle_s · 9f5e2f7f
      Al Viro authored
      no point, really - we couldn't keep those across the calls of
      getdents(); it would be too easy to DoS, having all slots exhausted.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarMike Marshall <hubcap@omnibond.com>
      9f5e2f7f
  6. 25 Mar, 2016 10 commits
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 606c61a0
      Linus Torvalds authored
      Merge fourth patch-bomb from Andrew Morton:
       "A lot more stuff than expected, sorry.  A bunch of ocfs2 reviewing was
        finished off.
      
         - mhocko's oom-reaper out-of-memory-handler changes
      
         - ocfs2 fixes and features
      
         - KASAN feature work
      
         - various fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (42 commits)
        thp: fix typo in khugepaged_scan_pmd()
        MAINTAINERS: fill entries for KASAN
        mm/filemap: generic_file_read_iter(): check for zero reads unconditionally
        kasan: test fix: warn if the UAF could not be detected in kmalloc_uaf2
        mm, kasan: stackdepot implementation. Enable stackdepot for SLAB
        arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections
        mm, kasan: add GFP flags to KASAN API
        mm, kasan: SLAB support
        kasan: modify kmalloc_large_oob_right(), add kmalloc_pagealloc_oob_right()
        include/linux/oom.h: remove undefined oom_kills_count()/note_oom_kill()
        mm/page_alloc: prevent merging between isolated and other pageblocks
        drivers/memstick/host/r592.c: avoid gcc-6 warning
        ocfs2: extend enough credits for freeing one truncate record while replaying truncate records
        ocfs2: extend transaction for ocfs2_remove_rightmost_path() and ocfs2_update_edge_lengths() before to avoid inconsistency between inode and et
        ocfs2/dlm: move lock to the tail of grant queue while doing in-place convert
        ocfs2: solve a problem of crossing the boundary in updating backups
        ocfs2: fix occurring deadlock by changing ocfs2_wq from global to local
        ocfs2/dlm: fix BUG in dlm_move_lockres_to_recovery_list
        ocfs2/dlm: fix race between convert and recovery
        ocfs2: fix a deadlock issue in ocfs2_dio_end_io_write()
        ...
      606c61a0
    • Linus Torvalds's avatar
      Merge tag 'pm+acpi-4.6-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 15dbc136
      Linus Torvalds authored
      Pull power management fixlet from Rafael Wysocki:
       "One of commits in my previous pull request changed the permissions of
        drivers/power/avs/rockchip-io-domain.c to executable by mistake"
      
      * tag 'pm+acpi-4.6-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        Fix permissions of drivers/power/avs/rockchip-io-domain.c
      15dbc136
    • Linus Torvalds's avatar
      Merge tag 'please-pull-preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux · dad44dec
      Linus Torvalds authored
      Pull ia64 update from Tony Luck:
       "Wire up new system calls p{read,write}v2 for ia64"
      
      * tag 'please-pull-preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
        [IA64] Enable preadv2 and pwritev2 syscalls for ia64
      dad44dec
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · c155c749
      Linus Torvalds authored
      Pull more input updates from Dmitry Torokhov:
       "Second round of updates for the input subsystem.
      
        The BYD PS/2 protocol driver now uses absolute reporting mode and
        should behave more like other touchpads; Synaptics driver needed to
        extend one of its quirks to a newer firmware version, and a few USB
        drivers got tightened up checks for the contents of their descriptors"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
        Input: sur40 - fix DMA on stack
        Input: ati_remote2 - fix crashes on detecting device with invalid descriptor
        Input: synaptics - handle spurious release of trackstick buttons, again
        Input: synaptics-rmi4 - remove check of Non-NULL array
        Input: byd - enable absolute mode
        Input: ims-pcu - sanity check against missing interfaces
        Input: melfas_mip4 - add hw_version sysfs attribute
      c155c749
    • Kirill A. Shutemov's avatar
      thp: fix typo in khugepaged_scan_pmd() · 0fda2788
      Kirill A. Shutemov authored
      !PageLRU should lead to SCAN_PAGE_LRU, not SCAN_SCAN_ABORT result.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Ebru Akagunduz <ebru.akagunduz@gmail.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0fda2788
    • Andrey Ryabinin's avatar
      MAINTAINERS: fill entries for KASAN · 0ba1d91d
      Andrey Ryabinin authored
      Signed-off-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Alexander Potapenko <glider@google.com>
      Acked-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0ba1d91d
    • Nicolai Stange's avatar
      mm/filemap: generic_file_read_iter(): check for zero reads unconditionally · e7080a43
      Nicolai Stange authored
      If
       - generic_file_read_iter() gets called with a zero read length,
       - the read offset is at a page boundary,
       - IOCB_DIRECT is not set
      -  and the page in question hasn't made it into the page cache yet,
      then do_generic_file_read() will trigger a readahead with a req_size hint
      of zero.
      
      Since roundup_pow_of_two(0) is undefined, UBSAN reports
      
        UBSAN: Undefined behaviour in include/linux/log2.h:63:13
        shift exponent 64 is too large for 64-bit type 'long unsigned int'
        CPU: 3 PID: 1017 Comm: sa1 Tainted: G L 4.5.0-next-20160318+ #14
        [...]
        Call Trace:
         [...]
         [<ffffffff813ef61a>] ondemand_readahead+0x3aa/0x3d0
         [<ffffffff813ef61a>] ? ondemand_readahead+0x3aa/0x3d0
         [<ffffffff813c73bd>] ? find_get_entry+0x2d/0x210
         [<ffffffff813ef9c3>] page_cache_sync_readahead+0x63/0xa0
         [<ffffffff813cc04d>] do_generic_file_read+0x80d/0xf90
         [<ffffffff813cc955>] generic_file_read_iter+0x185/0x420
         [...]
         [<ffffffff81510b06>] __vfs_read+0x256/0x3d0
         [...]
      
      when get_init_ra_size() gets called from ondemand_readahead().
      
      The net effect is that the initial readahead size is arch dependent for
      requested read lengths of zero: for example, since
      
        1UL << (sizeof(unsigned long) * 8)
      
      evaluates to 1 on x86 while its result is 0 on ARMv7, the initial readahead
      size becomes 4 on the former and 0 on the latter.
      
      What's more, whether or not the file access timestamp is updated for zero
      length reads is decided differently for the two cases of IOCB_DIRECT
      being set or cleared: in the first case, generic_file_read_iter()
      explicitly skips updating that timestamp while in the latter case, it is
      always updated through the call to do_generic_file_read().
      
      According to POSIX, zero length reads "do not modify the last data access
      timestamp" and thus, the IOCB_DIRECT behaviour is POSIXly correct.
      
      Let generic_file_read_iter() unconditionally check the requested read
      length at its entry and return immediately with success if it is zero.
      Signed-off-by: default avatarNicolai Stange <nicstange@gmail.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e7080a43
    • Alexander Potapenko's avatar
      kasan: test fix: warn if the UAF could not be detected in kmalloc_uaf2 · 9dcadd38
      Alexander Potapenko authored
      Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
      Acked-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andrey Konovalov <adech.fo@gmail.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Konstantin Serebryany <kcc@google.com>
      Cc: Dmitry Chernenkov <dmitryc@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9dcadd38
    • Alexander Potapenko's avatar
      mm, kasan: stackdepot implementation. Enable stackdepot for SLAB · cd11016e
      Alexander Potapenko authored
      Implement the stack depot and provide CONFIG_STACKDEPOT.  Stack depot
      will allow KASAN store allocation/deallocation stack traces for memory
      chunks.  The stack traces are stored in a hash table and referenced by
      handles which reside in the kasan_alloc_meta and kasan_free_meta
      structures in the allocated memory chunks.
      
      IRQ stack traces are cut below the IRQ entry point to avoid unnecessary
      duplication.
      
      Right now stackdepot support is only enabled in SLAB allocator.  Once
      KASAN features in SLAB are on par with those in SLUB we can switch SLUB
      to stackdepot as well, thus removing the dependency on SLUB stack
      bookkeeping, which wastes a lot of memory.
      
      This patch is based on the "mm: kasan: stack depots" patch originally
      prepared by Dmitry Chernenkov.
      
      Joonsoo has said that he plans to reuse the stackdepot code for the
      mm/page_owner.c debugging facility.
      
      [akpm@linux-foundation.org: s/depot_stack_handle/depot_stack_handle_t]
      [aryabinin@virtuozzo.com: comment style fixes]
      Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
      Signed-off-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andrey Konovalov <adech.fo@gmail.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Konstantin Serebryany <kcc@google.com>
      Cc: Dmitry Chernenkov <dmitryc@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cd11016e
    • Alexander Potapenko's avatar
      arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections · be7635e7
      Alexander Potapenko authored
      KASAN needs to know whether the allocation happens in an IRQ handler.
      This lets us strip everything below the IRQ entry point to reduce the
      number of unique stack traces needed to be stored.
      
      Move the definition of __irq_entry to <linux/interrupt.h> so that the
      users don't need to pull in <linux/ftrace.h>.  Also introduce the
      __softirq_entry macro which is similar to __irq_entry, but puts the
      corresponding functions to the .softirqentry.text section.
      Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andrey Konovalov <adech.fo@gmail.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
      Cc: Konstantin Serebryany <kcc@google.com>
      Cc: Dmitry Chernenkov <dmitryc@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      be7635e7