1. 19 2月, 2015 26 次提交
  2. 09 2月, 2015 5 次提交
    • L
      Linux 3.19 · bfa76d49
      Linus Torvalds 提交于
      bfa76d49
    • L
      Merge tag 'nios2-fixes-v3.19-final' of git://git.rocketboards.org/linux-socfpga-next · da2d96d3
      Linus Torvalds 提交于
      Pull nios2 fix from Ley Foon Tan:
       "This fixes incorrect behavior of some user programs"
      
      * tag 'nios2-fixes-v3.19-final' of git://git.rocketboards.org/linux-socfpga-next:
        nios2: fix unhandled signals
      da2d96d3
    • L
      Merge git://git.kvack.org/~bcrl/aio-fixes · cdecbb33
      Linus Torvalds 提交于
      Pull aio nested sleep annotation from Ben LaHaise,
      
      * git://git.kvack.org/~bcrl/aio-fixes:
        aio: annotate aio_read_event_ring for sleep patterns
      cdecbb33
    • L
      Merge tag 'trace-fixes-v3.19-rc7' of... · 4e02370f
      Linus Torvalds 提交于
      Merge tag 'trace-fixes-v3.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
      
      Pull ftrace fixes from Steven Rostedt:
       "During testing Sedat Dilek hit a "suspicious RCU usage" splat that
        pointed out a real bug.  During suspend and resume the tlb_flush
        tracepoint is called when the CPU is going offline.  As the CPU has
        been noted as offline, RCU is ignoring that CPU, which means that it
        can not use RCU protected locks.  When tracepoints are activated, they
        require RCU locking, and if RCU is ignoring a CPU that runs a
        tracepoint, there is a chance that the tracepoint could cause
        corruption.
      
        The solution was to change the tracepoint into a
        TRACE_EVENT_CONDITION() which allows us to check a condition to
        determine if the tracepoint should be called or not.  If the condition
        is not met, the rcu protected code will not be executed.  By adding
        the condition "cpu_online(smp_processor_id())", this will prevent the
        RCU protected code from being executed if the CPU is marked offline.
      
        After adding this, another bug was discovered.  As RCU checks rcu
        callers, if a rcu call is not done, there is no check (obviously).  We
        found that tracepoints could be added in RCU ignored locations and not
        have lockdep complain until the tracepoint is activated.  This missed
        places where tracepoints were added in places they should not have
        been.  To fix this, code was added in 3.18 that if lockdep is enabled,
        any tracepoint will still call the rcu checks even if the tracepoint
        is not enabled.  The bug here, is that the check does not take the
        CONDITION into account.  As the condition may prevent tracepoints from
        being activated in RCU ignored areas (as the one patch does), we get
        false positives when we enable lockdep and hit a tracepoint that the
        condition prevents it from being called in a RCU ignored location.
      
        The fix for this is to add the CONDITION to the rcu checks, even if
        the tracepoint is not enabled"
      
      * tag 'trace-fixes-v3.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
        x86/tlb/trace: Do not trace on CPU that is offline
        tracing: Add condition check to RCU lockdep checks
      4e02370f
    • C
      nios2: fix unhandled signals · a3248d60
      Chung-Ling Tang 提交于
      Follow other architectures for user fault handling.
      Signed-off-by: NChung-Ling Tang <cltang@codesourcery.com>
      Acked-by: NLey Foon Tan <lftan@altera.com>
      a3248d60
  3. 08 2月, 2015 4 次提交
    • S
      x86/tlb/trace: Do not trace on CPU that is offline · 6c8465a8
      Steven Rostedt (Red Hat) 提交于
      When taking a CPU down for suspend and resume, a tracepoint may be called
      when the CPU has been designated offline. As tracepoints require RCU for
      protection, they must not be called if the current CPU is offline.
      
      Unfortunately, trace_tlb_flush() is called in this scenario as was noted
      by LOCKDEP:
      
      ...
      
       Disabling non-boot CPUs ...
       intel_pstate CPU 1 exiting
      
       ===============================
       smpboot: CPU 1 didn't die...
       [ INFO: suspicious RCU usage. ]
       3.19.0-rc7-next-20150204.1-iniza-small #1 Not tainted
       -------------------------------
       include/trace/events/tlb.h:35 suspicious rcu_dereference_check() usage!
      
       other info that might help us debug this:
      
       RCU used illegally from offline CPU!
       rcu_scheduler_active = 1, debug_locks = 0
       no locks held by swapper/1/0.
      
       stack backtrace:
       CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.19.0-rc7-next-20150204.1-iniza-small #1
       Hardware name: SAMSUNG ELECTRONICS CO., LTD. 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH, BIOS 13XK 03/28/2013
        0000000000000001 ffff88011a44fe18 ffffffff817e370d 0000000000000011
        ffff88011a448290 ffff88011a44fe48 ffffffff810d6847 ffff8800c66b9600
        0000000000000001 ffff88011a44c000 ffffffff81cb3900 ffff88011a44fe78
       Call Trace:
        [<ffffffff817e370d>] dump_stack+0x4c/0x65
        [<ffffffff810d6847>] lockdep_rcu_suspicious+0xe7/0x120
        [<ffffffff810b71a5>] idle_task_exit+0x205/0x2c0
        [<ffffffff81054c4e>] play_dead_common+0xe/0x50
        [<ffffffff81054ca5>] native_play_dead+0x15/0x140
        [<ffffffff8102963f>] arch_cpu_idle_dead+0xf/0x20
        [<ffffffff810cd89e>] cpu_startup_entry+0x37e/0x580
        [<ffffffff81053e20>] start_secondary+0x140/0x150
       intel_pstate CPU 2 exiting
      
      ...
      
      By converting the tlb_flush tracepoint to a TRACE_EVENT_CONDITION where the
      condition is cpu_online(smp_processor_id()), we can avoid calling RCU protected
      code when the CPU is offline.
      
      Link: http://lkml.kernel.org/r/CA+icZUUGiGDoL5NU8RuxKzFjoLjEKRtUWx=JB8B9a0EQv-eGzQ@mail.gmail.com
      
      Cc: stable@vger.kernel.org # 3.17+
      Fixes: d17d8f9d "x86/mm: Add tracepoints for TLB flushes"
      Reported-by: NSedat Dilek <sedat.dilek@gmail.com>
      Tested-by: NSedat Dilek <sedat.dilek@gmail.com>
      Suggested-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Acked-by: NDave Hansen <dave@sr71.net>
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      6c8465a8
    • S
      tracing: Add condition check to RCU lockdep checks · a05d59a5
      Steven Rostedt (Red Hat) 提交于
      The trace_tlb_flush() tracepoint can be called when a CPU is going offline.
      When a CPU is offline, RCU is no longer watching that CPU and since the
      tracepoint is protected by RCU, it must not be called. To prevent the
      tlb_flush tracepoint from being called when the CPU is offline, it was
      converted to a TRACE_EVENT_CONDITION where the condition checks if the
      CPU is online before calling the tracepoint.
      
      Unfortunately, this was not enough to stop lockdep from complaining about
      it. Even though the RCU protected code of the tracepoint will never be
      called, the condition is hidden within the tracepoint, and even though the
      condition prevents RCU code from being called, the lockdep checks are
      outside the tracepoint (this is to test tracepoints even when they are not
      enabled).
      
      Even though tracepoints should be checked to be RCU safe when they are not
      enabled, the condition should still be considered when checking RCU.
      
      Link: http://lkml.kernel.org/r/CA+icZUUGiGDoL5NU8RuxKzFjoLjEKRtUWx=JB8B9a0EQv-eGzQ@mail.gmail.com
      
      Fixes: 3a630178 "tracing: generate RCU warnings even when tracepoints are disabled"
      Cc: stable@vger.kernel.org # 3.18+
      Acked-by: NDave Hansen <dave@sr71.net>
      Reported-by: NSedat Dilek <sedat.dilek@gmail.com>
      Tested-by: NSedat Dilek <sedat.dilek@gmail.com>
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      a05d59a5
    • L
      Merge tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband · 0b1ce1a8
      Linus Torvalds 提交于
      Pull one more infiniband revert from Roland Dreier:
       "One more last-second RDMA change for 3.19: Yann realized that the
        previous revert of new userspace ABI did not go far enough, and we're
        still exposing a change that we don't want.  Revert even closer to
        3.18 interface to make sure we get things right in the long run"
      
      Yann Droneaud pipes up:
       "I hope this could go in v3.19 as, at this stage, we don't want to
        expose any bits of this ABI in a released kernel"
      
      * tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
        Revert "IB/core: Add support for extended query device caps"
      0b1ce1a8
    • L
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · bdfeb5a1
      Linus Torvalds 提交于
      Pull btrfs fix from Chris Mason:
       "Forrest Liu tracked down a missing blk_finish_plug in the btrfs
        logging code.  This isn't a new bug, and it's hard to hit.  But, it's
        safe enough for inclusion now, and in my for-linus branch"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
        Btrfs: add missing blk_finish_plug in btrfs_sync_log()
      bdfeb5a1
  4. 07 2月, 2015 5 次提交