1. 15 Mar, 2016 22 commits
    • Jesper Dangaard Brouer's avatar
      mm: fault-inject take over bootstrap kmem_cache check · fab9963a
      Jesper Dangaard Brouer authored
      Remove the SLAB specific function slab_should_failslab(), by moving the
      check against fault-injection for the bootstrap slab, into the shared
      function should_failslab() (used by both SLAB and SLUB).
      
      This is a step towards sharing alloc_hook's between SLUB and SLAB.
      
      This bootstrap slab "kmem_cache" is used for allocating struct
      kmem_cache objects to the allocator itself.
      Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.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: Vladimir Davydov <vdavydov@virtuozzo.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fab9963a
    • Jesper Dangaard Brouer's avatar
      mm/slab: move SLUB alloc hooks to common mm/slab.h · 11c7aec2
      Jesper Dangaard Brouer authored
      First step towards sharing alloc_hook's between SLUB and SLAB
      allocators.  Move the SLUB allocators *_alloc_hook to the common
      mm/slab.h for internal slab definitions.
      Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.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: Vladimir Davydov <vdavydov@virtuozzo.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      11c7aec2
    • Jesper Dangaard Brouer's avatar
      slub: clean up code for kmem cgroup support to kmem_cache_free_bulk · 376bf125
      Jesper Dangaard Brouer authored
      This change is primarily an attempt to make it easier to realize the
      optimizations the compiler performs in-case CONFIG_MEMCG_KMEM is not
      enabled.
      
      Performance wise, even when CONFIG_MEMCG_KMEM is compiled in, the
      overhead is zero.  This is because, as long as no process have enabled
      kmem cgroups accounting, the assignment is replaced by asm-NOP
      operations.  This is possible because memcg_kmem_enabled() uses a
      static_key_false() construct.
      
      It also helps readability as it avoid accessing the p[] array like:
      p[size - 1] which "expose" that the array is processed backwards inside
      helper function build_detached_freelist().
      
      Lastly this also makes the code more robust, in error case like passing
      NULL pointers in the array.  Which were previously handled before commit
      03374518 ("slub: add missing kmem cgroup support to
      kmem_cache_free_bulk").
      
      Fixes: 03374518 ("slub: add missing kmem cgroup support to kmem_cache_free_bulk")
      Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.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: Vladimir Davydov <vdavydov@virtuozzo.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      376bf125
    • Arnd Bergmann's avatar
      paride: make 'verbose' parameter an 'int' again · dec63a4d
      Arnd Bergmann authored
      gcc-6.0 found an ancient bug in the paride driver, which had a
      "module_param(verbose, bool, 0);" since before 2.6.12, but actually uses
      it to accept '0', '1' or '2' as arguments:
      
        drivers/block/paride/pd.c: In function 'pd_init_dev_parms':
        drivers/block/paride/pd.c:298:29: warning: comparison of constant '1' with boolean expression is always false [-Wbool-compare]
         #define DBMSG(msg) ((verbose>1)?(msg):NULL)
      
      In 2012, Rusty did a cleanup patch that also changed the type of the
      variable to 'bool', which introduced what is now a gcc warning.
      
      This changes the type back to 'int' and adapts the module_param() line
      instead, so it should work as documented in case anyone ever cares about
      running the ancient driver with debugging.
      
      Fixes: 90ab5ee9 ("module_param: make bool parameters really bool (drivers & misc)")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Rusty Russell <rusty@rustcorp.com.au>
      Cc: Tim Waugh <tim@cyberelk.net>
      Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
      Cc: Jens Axboe <axboe@fb.com>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      dec63a4d
    • San Mehat's avatar
      block: partition: add partition specific uevent callbacks for partition info · 0d9c51a6
      San Mehat authored
      This patch has been carried in the Android tree for quite some time and
      is one of the few patches required to get a mainline kernel up and
      running with an exsiting Android userspace.  So I wanted to submit it
      for review and consideration if it should be merged.
      
      For partitions, add new uevent parameters 'PARTN' which specifies the
      partitions index in the table, and 'PARTNAME', which specifies PARTNAME
      specifices the partition name of a partition device.
      
      Android's userspace uses this for creating device node links from the
      partition name and number, ie:
      
          /dev/block/platform/soc/by-name/system
      or
          /dev/block/platform/soc/by-num/p1
      
      One can see its usage here:
          https://android.googlesource.com/platform/system/core/+/master/init/devices.cpp#355
      and
          https://android.googlesource.com/platform/system/core/+/master/init/devices.cpp#494
      
      [john.stultz@linaro.org: dropped NPARTS and reworded commit message for context]
      Signed-off-by: default avatarDima Zavin <dima@android.com>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      Cc: Jens Axboe <axboe@kernel.dk>
      Cc: Rom Lemarchand <romlem@google.com>
      Cc: Android Kernel Team <kernel-team@android.com>
      Cc: Jeff Moyer <jmoyer@redhat.com>
      Cc: <harald@redhat.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Kay Sievers <kay@vrfy.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0d9c51a6
    • Jun Piao's avatar
      ocfs2/dlm: fix a variable overflow problem in dlmdomain.c · 8d67d3c2
      Jun Piao authored
      In dlm_send_join_cancels(), node is defined with type unsigned int, but
      initialized with -1, this will lead variable overflow.  Although this
      won't cause any runtime problem, the code looks a little uncoordinated.
      Signed-off-by: default avatarJun Piao <piaojun@huawei.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d67d3c2
    • Jiufei Xue's avatar
      ocfs2: fix a tiny race that leads file system read-only · 814ce694
      Jiufei Xue authored
      when o2hb detect a node down, it first set the dead node to recovery map
      and create ocfs2rec which will replay journal for dead node.  o2hb
      thread then call dlm_do_local_recovery_cleanup() to delete the lock for
      dead node.  After the lock of dead node is gone, locks for other nodes
      can be granted and may modify the meta data without replaying journal of
      the dead node.  The detail is described as follows.
      
           N1                         N2                   N3(master)
      modify the extent tree of
      inode, and commit
      dirty metadata to journal,
      then goes down.
                                                       o2hb thread detects
                                                       N1 goes down, set
                                                       recovery map and
                                                       delete the lock of N1.
      
                                                       dlm_thread flush ast
                                                       for the lock of N2.
                              do not detect the death
                              of N1, so recovery map is
                              empty.
      
                              read inode from disk
                              without replaying
                              the journal of N1 and
                              modify the extent tree
                              of the inode that N1
                              had modified.
                                                       ocfs2rec recover the
                                                       journal of N1.
                                                       The modification of N2
                                                       is lost.
      
      The modification of N1 and N2 are not serial, and it will lead to
      read-only file system.  We can set recovery_waiting flag to the lock
      resource after delete the lock for dead node to prevent other node from
      getting the lock before dlm recovery.  After dlm recovery, the recovery
      map on N2 is not empty, ocfs2_inode_lock_full_nested() will wait for ocfs2
      recovery.
      Signed-off-by: default avatarJiufei Xue <xuejiufei@huawei.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      814ce694
    • xuejiufei's avatar
      ocfs2/dlm: return EINVAL when the lockres on migration target is in DROPPING_REF state · d277f33e
      xuejiufei authored
      If master migrate this lock resource to node when it happened to purge
      it, a new lock resource will be created and inserted into hash list.  If
      then master goes down, the lock resource being purged is recovered, so
      there exist two lock resource with different owner.  So return error to
      master if the lock resource is in DROPPING state, master will retry to
      migrate this lock resource.
      Signed-off-by: default avatarxuejiufei <xuejiufei@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d277f33e
    • xuejiufei's avatar
      ocfs2/dlm: clear DROPPING_REF flag when the master goes down · 8c034396
      xuejiufei authored
      If the master goes down after return in-progress for deref message.  The
      lock resource on non-master node can not be purged.  Clear the
      DROPPING_REF flag and recovery it.
      Signed-off-by: default avatarxuejiufei <xuejiufei@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8c034396
    • xuejiufei's avatar
      ocfs2/dlm: return in progress if master can not clear the refmap bit right now · 842b90b6
      xuejiufei authored
      Master returns in-progress to non-master node when it can not clear the
      refmap bit right now.  And non-master node will not purge the lock
      resource until receiving deref done message.
      Signed-off-by: default avatarxuejiufei <xuejiufei@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      842b90b6
    • xuejiufei's avatar
      ocfs2/dlm: add DEREF_DONE message · 60d663cb
      xuejiufei authored
      This series of patches is to fix the dis-order issue of setting/clearing
      refmap bit described below.
      
      Node 1                               Node 2(master)
      dlmlock
      dlm_do_master_request
                                      dlm_master_request_handler
                                      -> dlm_lockres_set_refmap_bit
      dlmlock succeed
      dlmunlock succeed
      
      dlm_purge_lockres
                                      dlm_deref_handler
                                      -> find lock resource is in
                                         DLM_LOCK_RES_SETREF_INPROG state,
                                         so dispatch a deref work
      dlm_purge_lockres succeed.
      
      call dlmlock again
      dlm_do_master_request
                                      dlm_master_request_handler
                                      -> dlm_lockres_set_refmap_bit
      
                                      deref work trigger, call
                                      dlm_lockres_clear_refmap_bit
                                      to clear Node 1 from refmap
      
                                      dlm_purge_lockres succeed
      
      dlm_send_remote_lock_request
                                      return DLM_IVLOCKID because
                                      the lockres is not exist
      BUG if the lockres is $RECOVERY
      
      This series of patches add a new message to keep the order of set and
      clear.  Other nodes can purge the lock resource only after the refmap bit
      on master is cleared.
      
      This patch is to add DEREF_DONE message and corresponding handler.  Node
      can purge the lock resource after receiving this message.  As a new
      message is added, so increase the minor number of dlm protocol version.
      Signed-off-by: default avatarxuejiufei <xuejiufei@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      60d663cb
    • Joseph Qi's avatar
      ocfs2/dlm: fix a typo in dlmcommon.h · 39b29af0
      Joseph Qi authored
      Refer to cluster/tcp.h, NET_MAX_PAYLOAD_BYTES is a typo for
      O2NET_MAX_PAYLOAD_BYTES.
      
      Since currently DLM_MIG_LOCKRES_RESERVED is not actually used, it won't
      cause any problem.  But we'd better correct it for further use.
      Signed-off-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Cc: Joseph Qi <joseph.qi@huawei.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      39b29af0
    • jiangyiwen's avatar
      ocfs2: use spinlock_irqsave() to downconvert lock in ocfs2_osb_dump() · bfd97a03
      jiangyiwen authored
      Commit a75e9cca ("ocfs2: use spinlock irqsave for downconvert lock")
      missed an unmodified place in ocfs2_osb_dump(), so it still exists a
      deadlock scenario.
      
          ocfs2_wake_downconvert_thread
          ocfs2_rw_unlock
          ocfs2_dio_end_io
          dio_complete
          .....
          bio_endio
          req_bio_endio
          ....
          scsi_io_completion
          blk_done_softirq
          __do_softirq
          do_softirq
          irq_exit
          do_IRQ
          ocfs2_osb_dump
          cat /sys/kernel/debug/ocfs2/${uuid}/fs_state
      
      This patch still uses spin_lock_irqsave() - replace spin_lock() to solve
      this situation.
      Signed-off-by: default avatarYiwen Jiang <jiangyiwen@huawei.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bfd97a03
    • jiangyiwen's avatar
      ocfs2/cluster: replace the interrupt safe spinlocks with common ones · 4d548f61
      jiangyiwen authored
      There actually no hardware or software interrupts in the context which
      using o2hb_live_lock, so we don't need to worry about race conditions
      caused by irq/softirq with spinlock held.  Turning off irq is not good
      for system performance after all.  Just replace them with a non
      interrupt safe function.
      Signed-off-by: default avatarYiwen Jiang <jiangyiwen@huawei.com>
      Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4d548f61
    • Sudip Mukherjee's avatar
      blackfin: define dummy pgprot_writecombine for !MMU · e928f350
      Sudip Mukherjee authored
      blackfin allmodconfig build fails with the error:
      
        ../sound/core/pcm_native.c: In function 'snd_pcm_lib_default_mmap':
        ../sound/core/pcm_native.c:3386:24: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
           area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
                                ^
        ../sound/core/pcm_native.c:3386:22: error: incompatible types when assigning to type 'pgprot_t {aka struct <anonymous>}' from type 'int'
           area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
                              ^
      
      When !MMU, asm-generic will not define default pgprot_writecombine, so
      blackfin needs to define it by itself.
      
      The patch idea is from commit 65b9ab88 ("arch/c6x/include/asm/pgtable.h:
      define dummy pgprot_writecombine for !MMU")
      Signed-off-by: default avatarSudip Mukherjee <sudip@vectorindia.org>
      Cc: Steven Miao <realmz6@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e928f350
    • Sudip Mukherjee's avatar
      m32r: mm: fix build warning · 3701dc81
      Sudip Mukherjee authored
      While building we are getting warnings:
      
        arch/m32r/mm/init.c:63:17: warning: unused variable 'low'
        arch/m32r/mm/init.c:62:17: warning: unused variable 'max_dma'
      
      max_dma and low are only used if CONFIG_MMU is defined.  Lets declare
      the variables inside the #ifdef.
      Signed-off-by: default avatarSudip Mukherjee <sudip@vectorindia.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3701dc81
    • Peter Zijlstra's avatar
      tags: Fix DEFINE_PER_CPU expansions · 25528213
      Peter Zijlstra authored
      $ make tags
        GEN     tags
      ctags: Warning: drivers/acpi/processor_idle.c:64: null expansion of name pattern "\1"
      ctags: Warning: drivers/xen/events/events_2l.c:41: null expansion of name pattern "\1"
      ctags: Warning: kernel/locking/lockdep.c:151: null expansion of name pattern "\1"
      ctags: Warning: kernel/rcu/rcutorture.c:133: null expansion of name pattern "\1"
      ctags: Warning: kernel/rcu/rcutorture.c:135: null expansion of name pattern "\1"
      ctags: Warning: kernel/workqueue.c:323: null expansion of name pattern "\1"
      ctags: Warning: net/ipv4/syncookies.c:53: null expansion of name pattern "\1"
      ctags: Warning: net/ipv6/syncookies.c:44: null expansion of name pattern "\1"
      ctags: Warning: net/rds/page.c:45: null expansion of name pattern "\1"
      
      Which are all the result of the DEFINE_PER_CPU pattern:
      
        scripts/tags.sh:200:	'/\<DEFINE_PER_CPU([^,]*, *\([[:alnum:]_]*\)/\1/v/'
        scripts/tags.sh:201:	'/\<DEFINE_PER_CPU_SHARED_ALIGNED([^,]*, *\([[:alnum:]_]*\)/\1/v/'
      
      The below cures them. All except the workqueue one are within reasonable
      distance of the 80 char limit. TJ do you have any preference on how to
      fix the wq one, or shall we just not care its too long?
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      25528213
    • Geliang Tang's avatar
      init/main.c: use list_for_each_entry() · e6fd1fb3
      Geliang Tang authored
      Use list_for_each_entry() instead of list_for_each() to simplify the code.
      Signed-off-by: default avatarGeliang Tang <geliangtang@163.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e6fd1fb3
    • Linus Torvalds's avatar
      Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · e23604ed
      Linus Torvalds authored
      Pull NOHZ updates from Ingo Molnar:
       "NOHZ enhancements, by Frederic Weisbecker, which reorganizes/refactors
        the NOHZ 'can the tick be stopped?' infrastructure and related code to
        be data driven, and harmonizes the naming and handling of all the
        various properties"
      
      [ This makes the ugly "fetch_or()" macro that the scheduler used
        internally a new generic helper, and does a bad job at it.
      
        I'm pulling it, but I've asked Ingo and Frederic to get this
        fixed up ]
      
      * 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        sched-clock: Migrate to use new tick dependency mask model
        posix-cpu-timers: Migrate to use new tick dependency mask model
        sched: Migrate sched to use new tick dependency mask model
        sched: Account rr tasks
        perf: Migrate perf to use new tick dependency mask model
        nohz: Use enum code for tick stop failure tracing message
        nohz: New tick dependency mask
        nohz: Implement wide kick on top of irq work
        atomic: Export fetch_or()
      e23604ed
    • Linus Torvalds's avatar
      Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · d4e79615
      Linus Torvalds authored
      Pull scheduler updates from Ingo Molnar:
       "The main changes in this cycle are:
      
         - Make schedstats a runtime tunable (disabled by default) and
           optimize it via static keys.
      
           As most distributions enable CONFIG_SCHEDSTATS=y due to its
           instrumentation value, this is a nice performance enhancement.
           (Mel Gorman)
      
         - Implement 'simple waitqueues' (swait): these are just pure
           waitqueues without any of the more complex features of full-blown
           waitqueues (callbacks, wake flags, wake keys, etc.).  Simple
           waitqueues have less memory overhead and are faster.
      
           Use simple waitqueues in the RCU code (in 4 different places) and
           for handling KVM vCPU wakeups.
      
           (Peter Zijlstra, Daniel Wagner, Thomas Gleixner, Paul Gortmaker,
           Marcelo Tosatti)
      
         - sched/numa enhancements (Rik van Riel)
      
         - NOHZ performance enhancements (Rik van Riel)
      
         - Various sched/deadline enhancements (Steven Rostedt)
      
         - Various fixes (Peter Zijlstra)
      
         - ... and a number of other fixes, cleanups and smaller enhancements"
      
      * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (29 commits)
        sched/cputime: Fix steal_account_process_tick() to always return jiffies
        sched/deadline: Remove dl_new from struct sched_dl_entity
        Revert "kbuild: Add option to turn incompatible pointer check into error"
        sched/deadline: Remove superfluous call to switched_to_dl()
        sched/debug: Fix preempt_disable_ip recording for preempt_disable()
        sched, time: Switch VIRT_CPU_ACCOUNTING_GEN to jiffy granularity
        time, acct: Drop irq save & restore from __acct_update_integrals()
        acct, time: Change indentation in __acct_update_integrals()
        sched, time: Remove non-power-of-two divides from __acct_update_integrals()
        sched/rt: Kick RT bandwidth timer immediately on start up
        sched/debug: Add deadline scheduler bandwidth ratio to /proc/sched_debug
        sched/debug: Move sched_domain_sysctl to debug.c
        sched/debug: Move the /sys/kernel/debug/sched_features file setup into debug.c
        sched/rt: Fix PI handling vs. sched_setscheduler()
        sched/core: Remove duplicated sched_group_set_shares() prototype
        sched/fair: Consolidate nohz CPU load update code
        sched/fair: Avoid using decay_load_missed() with a negative value
        sched/deadline: Always calculate end of period on sched_yield()
        sched/cgroup: Fix cgroup entity load tracking tear-down
        rcu: Use simple wait queues where possible in rcutree
        ...
      d4e79615
    • Linus Torvalds's avatar
      Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · d88bfe1d
      Linus Torvalds authored
      Pull RAS updates from Ingo Molnar:
       "Various RAS updates:
      
         - AMD MCE support updates for future CPUs, fixes and 'SMCA' (Scalable
           MCA) error decoding support (Aravind Gopalakrishnan)
      
         - x86 memcpy_mcsafe() support, to enable smart(er) hardware error
           recovery in NVDIMM drivers, based on an extension of the x86
           exception handling code.  (Tony Luck)"
      
      * 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        EDAC/sb_edac: Fix computation of channel address
        x86/mm, x86/mce: Add memcpy_mcsafe()
        x86/mce/AMD: Document some functionality
        x86/mce: Clarify comments regarding deferred error
        x86/mce/AMD: Fix logic to obtain block address
        x86/mce/AMD, EDAC: Enable error decoding of Scalable MCA errors
        x86/mce: Move MCx_CONFIG MSR definitions
        x86/mce: Check for faults tagged in EXTABLE_CLASS_FAULT exception table entries
        x86/mm: Expand the exception table logic to allow new handling options
        x86/mce/AMD: Set MCAX Enable bit
        x86/mce/AMD: Carve out threshold block preparation
        x86/mce/AMD: Fix LVT offset configuration for thresholding
        x86/mce/AMD: Reduce number of blocks scanned per bank
        x86/mce/AMD: Do not perform shared bank check for future processors
        x86/mce: Fix order of AMD MCE init function call
      d88bfe1d
    • Linus Torvalds's avatar
      Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · e71c2c1e
      Linus Torvalds authored
      Pull perf updates from Ingo Molnar:
       "Main kernel side changes:
      
         - Big reorganization of the x86 perf support code.  The old code grew
           organically deep inside arch/x86/kernel/cpu/perf* and its naming
           became somewhat messy.
      
           The new location is under arch/x86/events/, using the following
           cleaner hierarchy of source code files:
      
             perf/x86: Move perf_event.c .................. => x86/events/core.c
             perf/x86: Move perf_event_amd.c .............. => x86/events/amd/core.c
             perf/x86: Move perf_event_amd_ibs.c .......... => x86/events/amd/ibs.c
             perf/x86: Move perf_event_amd_iommu.[ch] ..... => x86/events/amd/iommu.[ch]
             perf/x86: Move perf_event_amd_uncore.c ....... => x86/events/amd/uncore.c
             perf/x86: Move perf_event_intel_bts.c ........ => x86/events/intel/bts.c
             perf/x86: Move perf_event_intel.c ............ => x86/events/intel/core.c
             perf/x86: Move perf_event_intel_cqm.c ........ => x86/events/intel/cqm.c
             perf/x86: Move perf_event_intel_cstate.c ..... => x86/events/intel/cstate.c
             perf/x86: Move perf_event_intel_ds.c ......... => x86/events/intel/ds.c
             perf/x86: Move perf_event_intel_lbr.c ........ => x86/events/intel/lbr.c
             perf/x86: Move perf_event_intel_pt.[ch] ...... => x86/events/intel/pt.[ch]
             perf/x86: Move perf_event_intel_rapl.c ....... => x86/events/intel/rapl.c
             perf/x86: Move perf_event_intel_uncore.[ch] .. => x86/events/intel/uncore.[ch]
             perf/x86: Move perf_event_intel_uncore_nhmex.c => x86/events/intel/uncore_nmhex.c
             perf/x86: Move perf_event_intel_uncore_snb.c   => x86/events/intel/uncore_snb.c
             perf/x86: Move perf_event_intel_uncore_snbep.c => x86/events/intel/uncore_snbep.c
             perf/x86: Move perf_event_knc.c .............. => x86/events/intel/knc.c
             perf/x86: Move perf_event_p4.c ............... => x86/events/intel/p4.c
             perf/x86: Move perf_event_p6.c ............... => x86/events/intel/p6.c
             perf/x86: Move perf_event_msr.c .............. => x86/events/msr.c
      
           (Borislav Petkov)
      
         - Update various x86 PMU constraint and hw support details (Stephane
           Eranian)
      
         - Optimize kprobes for BPF execution (Martin KaFai Lau)
      
         - Rewrite, refactor and fix the Intel uncore PMU driver code (Thomas
           Gleixner)
      
         - Rewrite, refactor and fix the Intel RAPL PMU code (Thomas Gleixner)
      
         - Various fixes and smaller cleanups.
      
        There are lots of perf tooling updates as well.  A few highlights:
      
        perf report/top:
      
           - Hierarchy histogram mode for 'perf top' and 'perf report',
             showing multiple levels, one per --sort entry: (Namhyung Kim)
      
             On a mostly idle system:
      
               # perf top --hierarchy -s comm,dso
      
             Then expand some levels and use 'P' to take a snapshot:
      
               # cat perf.hist.0
               -  92.32%         perf
                     58.20%         perf
                     22.29%         libc-2.22.so
                      5.97%         [kernel]
                      4.18%         libelf-0.165.so
                      1.69%         [unknown]
               -   4.71%         qemu-system-x86
                      3.10%         [kernel]
                      1.60%         qemu-system-x86_64 (deleted)
               +   2.97%         swapper
               #
      
           - Add 'L' hotkey to dynamicly set the percent threshold for
             histogram entries and callchains, i.e.  dynamicly do what the
             --percent-limit command line option to 'top' and 'report' does.
             (Namhyung Kim)
      
        perf mem:
      
           - Allow specifying events via -e in 'perf mem record', also listing
             what events can be specified via 'perf mem record -e list' (Jiri
             Olsa)
      
        perf record:
      
           - Add 'perf record' --all-user/--all-kernel options, so that one
             can tell that all the events in the command line should be
             restricted to the user or kernel levels (Jiri Olsa), i.e.:
      
               perf record -e cycles:u,instructions:u
      
             is equivalent to:
      
               perf record --all-user -e cycles,instructions
      
           - Make 'perf record' collect CPU cache info in the perf.data file header:
      
               $ perf record usleep 1
               [ perf record: Woken up 1 times to write data ]
               [ perf record: Captured and wrote 0.017 MB perf.data (7 samples) ]
               $ perf report --header-only -I | tail -10 | head -8
               # CPU cache info:
               #  L1 Data                 32K [0-1]
               #  L1 Instruction          32K [0-1]
               #  L1 Data                 32K [2-3]
               #  L1 Instruction          32K [2-3]
               #  L2 Unified             256K [0-1]
               #  L2 Unified             256K [2-3]
               #  L3 Unified            4096K [0-3]
      
             Will be used in 'perf c2c' and eventually in 'perf diff' to
             allow, for instance running the same workload in multiple
             machines and then when using 'diff' show the hardware difference.
             (Jiri Olsa)
      
           - Improved support for Java, using the JVMTI agent library to do
             jitdumps that then will be inserted in synthesized
             PERF_RECORD_MMAP2 events via 'perf inject' pointed to synthesized
             ELF files stored in ~/.debug and keyed with build-ids, to allow
             symbol resolution and even annotation with source line info, see
             the changeset comments to see how to use it (Stephane Eranian)
      
        perf script/trace:
      
           - Decode data_src values (e.g.  perf.data files generated by 'perf
             mem record') in 'perf script': (Jiri Olsa)
      
               # perf script
                 perf 693 [1] 4.088652: 1 cpu/mem-loads,ldlat=30/P: ffff88007d0b0f40 68100142 L1 hit|SNP None|TLB L1 or L2 hit|LCK No <SNIP>
                                                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
           - Improve support to 'data_src', 'weight' and 'addr' fields in
             'perf script' (Jiri Olsa)
      
           - Handle empty print fmts in 'perf script -s' i.e. when running
             python or perl scripts (Taeung Song)
      
        perf stat:
      
           - 'perf stat' now shows shadow metrics (insn per cycle, etc) in
             interval mode too.  E.g:
      
               # perf stat -I 1000 -e instructions,cycles sleep 1
               #         time   counts unit events
                  1.000215928  519,620      instructions     #  0.69 insn per cycle
                  1.000215928  752,003      cycles
               <SNIP>
      
           - Port 'perf kvm stat' to PowerPC (Hemant Kumar)
      
           - Implement CSV metrics output in 'perf stat' (Andi Kleen)
      
        perf BPF support:
      
           - Support converting data from bpf events in 'perf data' (Wang Nan)
      
           - Print bpf-output events in 'perf script': (Wang Nan).
      
               # perf record -e bpf-output/no-inherit,name=evt/ -e ./test_bpf_output_3.c/map:channel.event=evt/ usleep 1000
               # perf script
                  usleep  4882 21384.532523:   evt:  ffffffff810e97d1 sys_nanosleep ([kernel.kallsyms])
                   BPF output: 0000: 52 61 69 73 65 20 61 20  Raise a
                               0008: 42 50 46 20 65 76 65 6e  BPF even
                               0010: 74 21 00 00              t!..
                   BPF string: "Raise a BPF event!"
               #
      
           - Add API to set values of map entries in a BPF object, be it
             individual map slots or ranges (Wang Nan)
      
           - Introduce support for the 'bpf-output' event (Wang Nan)
      
           - Add glue to read perf events in a BPF program (Wang Nan)
      
           - Improve support for bpf-output events in 'perf trace' (Wang Nan)
      
        ... and tons of other changes as well - see the shortlog and git log
        for details!"
      
      * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (342 commits)
        perf stat: Add --metric-only support for -A
        perf stat: Implement --metric-only mode
        perf stat: Document CSV format in manpage
        perf hists browser: Check sort keys before hot key actions
        perf hists browser: Allow thread filtering for comm sort key
        perf tools: Add sort__has_comm variable
        perf tools: Recalc total periods using top-level entries in hierarchy
        perf tools: Remove nr_sort_keys field
        perf hists browser: Cleanup hist_browser__fprintf_hierarchy_entry()
        perf tools: Remove hist_entry->fmt field
        perf tools: Fix command line filters in hierarchy mode
        perf tools: Add more sort entry check functions
        perf tools: Fix hist_entry__filter() for hierarchy
        perf jitdump: Build only on supported archs
        tools lib traceevent: Add '~' operation within arg_num_eval()
        perf tools: Omit unnecessary cast in perf_pmu__parse_scale
        perf tools: Pass perf_hpp_list all the way through setup_sort_list
        perf tools: Fix perf script python database export crash
        perf jitdump: DWARF is also needed
        perf bench mem: Prepare the x86-64 build for upstream memcpy_mcsafe() changes
        ...
      e71c2c1e
  2. 14 Mar, 2016 5 commits
    • Linus Torvalds's avatar
      Merge branch 'mm-readonly-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · d09e356a
      Linus Torvalds authored
      Pull read-only kernel memory updates from Ingo Molnar:
       "This tree adds two (security related) enhancements to the kernel's
        handling of read-only kernel memory:
      
         - extend read-only kernel memory to a new class of formerly writable
           kernel data: 'post-init read-only memory' via the __ro_after_init
           attribute, and mark the ARM and x86 vDSO as such read-only memory.
      
           This kind of attribute can be used for data that requires a once
           per bootup initialization sequence, but is otherwise never modified
           after that point.
      
           This feature was based on the work by PaX Team and Brad Spengler.
      
           (by Kees Cook, the ARM vDSO bits by David Brown.)
      
         - make CONFIG_DEBUG_RODATA always enabled on x86 and remove the
           Kconfig option.  This simplifies the kernel and also signals that
           read-only memory is the default model and a first-class citizen.
           (Kees Cook)"
      
      * 'mm-readonly-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        ARM/vdso: Mark the vDSO code read-only after init
        x86/vdso: Mark the vDSO code read-only after init
        lkdtm: Verify that '__ro_after_init' works correctly
        arch: Introduce post-init read-only memory
        x86/mm: Always enable CONFIG_DEBUG_RODATA and remove the Kconfig option
        mm/init: Add 'rodata=off' boot cmdline parameter to disable read-only kernel mappings
        asm-generic: Consolidate mark_rodata_ro()
      d09e356a
    • Linus Torvalds's avatar
      Merge branch 'mm-pat-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 5ec94246
      Linus Torvalds authored
      Pull dma_*_writecombine rename from Ingo Molnar:
       "Rename dma_*_writecombine() to dma_*_wc()
      
        This is a tree-wide API rename, to move the dma_*() write-combining
        APIs closer in name to their usual API families.  (The old API names
        are kept as compatibility wrappers to not introduce extra breakage.)
      
        The patch was Coccinelle generated"
      
      * 'mm-pat-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        dma, mm/pat: Rename dma_*_writecombine() to dma_*_wc()
      5ec94246
    • Linus Torvalds's avatar
      Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · fbed0bc0
      Linus Torvalds authored
      Pull locking changes from Ingo Molnar:
       "Various updates:
      
         - Futex scalability improvements: remove page lock use for shared
           futex get_futex_key(), which speeds up 'perf bench futex hash'
           benchmarks by over 40% on a 60-core Westmere.  This makes anon-mem
           shared futexes perform close to private futexes.  (Mel Gorman)
      
         - lockdep hash collision detection and fix (Alfredo Alvarez
           Fernandez)
      
         - lockdep testing enhancements (Alfredo Alvarez Fernandez)
      
         - robustify lockdep init by using hlists (Andrew Morton, Andrey
           Ryabinin)
      
         - mutex and csd_lock micro-optimizations (Davidlohr Bueso)
      
         - small x86 barriers tweaks (Michael S Tsirkin)
      
         - qspinlock updates (Waiman Long)"
      
      * 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (25 commits)
        locking/csd_lock: Use smp_cond_acquire() in csd_lock_wait()
        locking/csd_lock: Explicitly inline csd_lock*() helpers
        futex: Replace barrier() in unqueue_me() with READ_ONCE()
        locking/lockdep: Detect chain_key collisions
        locking/lockdep: Prevent chain_key collisions
        tools/lib/lockdep: Fix link creation warning
        tools/lib/lockdep: Add tests for AA and ABBA locking
        tools/lib/lockdep: Add userspace version of READ_ONCE()
        tools/lib/lockdep: Fix the build on recent kernels
        locking/qspinlock: Move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock_types.h
        locking/mutex: Allow next waiter lockless wakeup
        locking/pvqspinlock: Enable slowpath locking count tracking
        locking/qspinlock: Use smp_cond_acquire() in pending code
        locking/pvqspinlock: Move lock stealing count tracking code into pv_queued_spin_steal_lock()
        locking/mcs: Fix mcs_spin_lock() ordering
        futex: Remove requirement for lock_page() in get_futex_key()
        futex: Rename barrier references in ordering guarantees
        locking/atomics: Update comment about READ_ONCE() and structures
        locking/lockdep: Eliminate lockdep_init()
        locking/lockdep: Convert hash tables to hlists
        ...
      fbed0bc0
    • Linus Torvalds's avatar
      Merge branch 'core-resources-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · d37a14bb
      Linus Torvalds authored
      Pull ram resource handling changes from Ingo Molnar:
       "Core kernel resource handling changes to support NVDIMM error
        injection.
      
        This tree introduces a new I/O resource type, IORESOURCE_SYSTEM_RAM,
        for System RAM while keeping the current IORESOURCE_MEM type bit set
        for all memory-mapped ranges (including System RAM) for backward
        compatibility.
      
        With this resource flag it no longer takes a strcmp() loop through the
        resource tree to find "System RAM" resources.
      
        The new resource type is then used to extend ACPI/APEI error injection
        facility to also support NVDIMM"
      
      * 'core-resources-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        ACPI/EINJ: Allow memory error injection to NVDIMM
        resource: Kill walk_iomem_res()
        x86/kexec: Remove walk_iomem_res() call with GART type
        x86, kexec, nvdimm: Use walk_iomem_res_desc() for iomem search
        resource: Add walk_iomem_res_desc()
        memremap: Change region_intersects() to take @flags and @desc
        arm/samsung: Change s3c_pm_run_res() to use System RAM type
        resource: Change walk_system_ram() to use System RAM type
        drivers: Initialize resource entry to zero
        xen, mm: Set IORESOURCE_SYSTEM_RAM to System RAM
        kexec: Set IORESOURCE_SYSTEM_RAM for System RAM
        arch: Set IORESOURCE_SYSTEM_RAM flag for System RAM
        ia64: Set System RAM type and descriptor
        x86/e820: Set System RAM type and descriptor
        resource: Add I/O resource descriptor
        resource: Handle resource flags properly
        resource: Add System RAM resource type
      d37a14bb
    • Linus Torvalds's avatar
      Linux 4.5 · b562e44f
      Linus Torvalds authored
      b562e44f
  3. 13 Mar, 2016 8 commits
  4. 12 Mar, 2016 5 commits
    • Ming Lei's avatar
      block: don't optimize for non-cloned bio in bio_get_last_bvec() · 90d0f0f1
      Ming Lei authored
      For !BIO_CLONED bio, we can use .bi_vcnt safely, but it
      doesn't mean we can just simply return .bi_io_vec[.bi_vcnt - 1]
      because the start postion may have been moved in the middle of
      the bvec, such as splitting in the middle of bvec.
      
      Fixes: 7bcd79ac(block: bio: introduce helpers to get the 1st and last bvec)
      Cc: stable@vger.kernel.org
      Reported-by: default avatarKent Overstreet <kent.overstreet@gmail.com>
      Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      90d0f0f1
    • Matt Fleming's avatar
      x86/efi: Fix boot crash by always mapping boot service regions into new EFI page tables · 452308de
      Matt Fleming authored
      Some machines have EFI regions in page zero (physical address
      0x00000000) and historically that region has been added to the e820
      map via trim_bios_range(), and ultimately mapped into the kernel page
      tables. It was not mapped via efi_map_regions() as one would expect.
      
      Alexis reports that with the new separate EFI page tables some boot
      services regions, such as page zero, are not mapped. This triggers an
      oops during the SetVirtualAddressMap() runtime call.
      
      For the EFI boot services quirk on x86 we need to memblock_reserve()
      boot services regions until after SetVirtualAddressMap(). Doing that
      while respecting the ownership of regions that may have already been
      reserved by the kernel was the motivation behind this commit:
      
        7d68dc3f ("x86, efi: Do not reserve boot services regions within reserved areas")
      
      That patch was merged at a time when the EFI runtime virtual mappings
      were inserted into the kernel page tables as described above, and the
      trick of setting ->numpages (and hence the region size) to zero to
      track regions that should not be freed in efi_free_boot_services()
      meant that we never mapped those regions in efi_map_regions(). Instead
      we were relying solely on the existing kernel mappings.
      
      Now that we have separate page tables we need to make sure the EFI
      boot services regions are mapped correctly, even if someone else has
      already called memblock_reserve(). Instead of stashing a tag in
      ->numpages, set the EFI_MEMORY_RUNTIME bit of ->attribute. Since it
      generally makes no sense to mark a boot services region as required at
      runtime, it's pretty much guaranteed the firmware will not have
      already set this bit.
      
      For the record, the specific circumstances under which Alexis
      triggered this bug was that an EFI runtime driver on his machine was
      responding to the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event during
      SetVirtualAddressMap().
      
      The event handler for this driver looks like this,
      
        sub rsp,0x28
        lea rdx,[rip+0x2445] # 0xaa948720
        mov ecx,0x4
        call func_aa9447c0  ; call to ConvertPointer(4, & 0xaa948720)
        mov r11,QWORD PTR [rip+0x2434] # 0xaa948720
        xor eax,eax
        mov BYTE PTR [r11+0x1],0x1
        add rsp,0x28
        ret
      
      Which is pretty typical code for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE
      handler. The "mov r11, QWORD PTR [rip+0x2424]" was the faulting
      instruction because ConvertPointer() was being called to convert the
      address 0x0000000000000000, which when converted is left unchanged and
      remains 0x0000000000000000.
      
      The output of the oops trace gave the impression of a standard NULL
      pointer dereference bug, but because we're accessing physical
      addresses during ConvertPointer(), it wasn't. EFI boot services code
      is stored at that address on Alexis' machine.
      Reported-by: default avatarAlexis Murzeau <amurzeau@gmail.com>
      Signed-off-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
      Cc: Ben Hutchings <ben@decadent.org.uk>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
      Cc: Matthew Garrett <mjg59@srcf.ucam.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Raphael Hertzog <hertzog@debian.org>
      Cc: Roger Shimizu <rogershimizu@gmail.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: linux-efi@vger.kernel.org
      Link: http://lkml.kernel.org/r/1457695163-29632-2-git-send-email-matt@codeblueprint.co.uk
      Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=815125Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      452308de
    • Borislav Petkov's avatar
      x86/fpu: Fix eager-FPU handling on legacy FPU machines · 6e686709
      Borislav Petkov authored
      i486 derived cores like Intel Quark support only the very old,
      legacy x87 FPU (FSAVE/FRSTOR, CPUID bit FXSR is not set), and
      our FPU code wasn't handling the saving and restoring there
      properly in the 'eagerfpu' case.
      
      So after we made eagerfpu the default for all CPU types:
      
        58122bf1 x86/fpu: Default eagerfpu=on on all CPUs
      
      these old FPU designs broke. First, Andy Shevchenko reported a splat:
      
        WARNING: CPU: 0 PID: 823 at arch/x86/include/asm/fpu/internal.h:163 fpu__clear+0x8c/0x160
      
      which was us trying to execute FXRSTOR on those machines even though
      they don't support it.
      
      After taking care of that, Bryan O'Donoghue reported that a simple FPU
      test still failed because we weren't initializing the FPU state properly
      on those machines.
      
      Take care of all that.
      Reported-and-tested-by: default avatarBryan O'Donoghue <pure.logic@nexus-software.ie>
      Reported-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Yu-cheng <yu-cheng.yu@intel.com>
      Link: http://lkml.kernel.org/r/20160311113206.GD4312@pd.tnicSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      6e686709
    • Linus Torvalds's avatar
      Merge tag 'for-linus-20160311' of git://git.infradead.org/linux-mtd · 03c668a9
      Linus Torvalds authored
      Pull MTD fixes from Brian Norris:
       "Late MTD fix for v4.5:
      
         - A simple error code handling fix for the NAND ECC test; this was a
           regression in v4.5-rc1
      
         - A MAINTAINERS update, which might as well go in ASAP"
      
      * tag 'for-linus-20160311' of git://git.infradead.org/linux-mtd:
        MAINTAINERS: add a maintainer for the NAND subsystem
        mtd: nand: tests: fix regression introduced in mtd_nandectest
      03c668a9
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · 3ab0a0f9
      Linus Torvalds authored
      Pull drm/i915 fixes from Dave Airlie:
       "Just two i915 regression fixes, that should be it from me"
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
        drm/i915: Actually retry with bit-banging after GMBUS timeout
        drm/i915: Fix bogus dig_port_map[] assignment for pre-HSW
      3ab0a0f9