Waiman Long cba77f03f2 locking/pvqspinlock: Fix kernel panic in locking-selftest ...

Enabling locking-selftest in a VM guest may cause the following
kernel panic:

  kernel BUG at .../kernel/locking/qspinlock_paravirt.h:137!

This is due to the fact that the pvqspinlock unlock function is
expecting either a _Q_LOCKED_VAL or _Q_SLOW_VAL in the lock
byte. This patch prevents that bug report by ignoring it when
debug_locks_silent is set. Otherwise, a warning will be printed
if it contains an unexpected value.

With this patch applied, the kernel locking-selftest completed
without any noise.

Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Waiman Long <Waiman.Long@hp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1436663959-53092-1-git-send-email-Waiman.Long@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2015-07-21 10:18:07 +02:00

..

lglock.c

sched/stop_machine: Fix deadlock between multiple stop_two_cpus()

2015-06-19 10:03:12 +02:00

lockdep_internals.h

lockdep: Increase static allocations

2014-04-18 14:20:50 +02:00

lockdep_proc.c

lockdep: Fix a race between /proc/lock_stat and module unload

2015-06-07 15:46:30 +02:00

lockdep_states.h

locking: Move the lockdep code to kernel/locking/

2013-11-06 07:55:08 +01:00

lockdep.c

Merge branch 'sched-hrtimers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-06-24 15:09:40 -07:00

locktorture.c

locktorture: Change longdelay_us to longdelay_ms

2015-05-27 12:59:57 -07:00

Makefile

locking/qrwlock: Rename QUEUE_RWLOCK to QUEUED_RWLOCKS

2015-05-12 09:46:00 +02:00

mcs_spinlock.h

locking/qspinlock: Introduce a simple generic 4-byte queued spinlock

2015-05-08 12:36:25 +02:00

mutex-debug.c

mutex: Always clear owner field upon mutex_unlock()

2015-01-09 11:20:39 +01:00

mutex-debug.h

locking: Move the mutex code to kernel/locking/

2013-11-06 07:55:07 +01:00

mutex.c

locking/mutex: Further simplify mutex_spin_on_owner()

2015-04-09 08:10:23 +02:00

mutex.h

locking/mutexes: Use MUTEX_SPIN_ON_OWNER when appropriate

2014-08-13 10:32:02 +02:00

osq_lock.c

locking: Remove ACCESS_ONCE() usage

2015-02-24 08:44:16 +01:00

percpu-rwsem.c

locking: Move the percpu-rwsem code to kernel/locking/

2013-11-06 09:24:22 +01:00

qrwlock.c

locking/qrwlock: Don't contend with readers when setting _QW_WAITING

2015-06-19 09:45:38 +02:00

qspinlock_paravirt.h

locking/pvqspinlock: Fix kernel panic in locking-selftest

2015-07-21 10:18:07 +02:00

qspinlock.c

locking/pvqspinlock: Implement simple paravirt support for the qspinlock

2015-05-08 12:37:05 +02:00

rtmutex_common.h

futex: Lower the lock contention on the HB lock during wake up

2015-06-19 21:26:38 +02:00

rtmutex-debug.c

rtmutex: Cleanup deadlock detector debug logic

2014-06-21 22:05:30 +02:00

rtmutex-debug.h

rtmutex: Cleanup deadlock detector debug logic

2014-06-21 22:05:30 +02:00

rtmutex-tester.c

locking: Move the rtmutex code to kernel/locking/

2013-11-06 09:23:59 +01:00

rtmutex.c

Merge branch 'sched-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-06-24 14:46:01 -07:00

rtmutex.h

rtmutex: Cleanup deadlock detector debug logic

2014-06-21 22:05:30 +02:00

rwsem-spinlock.c

locking/rwsem: Document barrier need when waking tasks

2015-02-18 16:57:10 +01:00

rwsem-xadd.c

locking/rwsem: Reduce spinlock contention in wakeup after up_read()/up_write()

2015-05-08 12:27:59 +02:00

rwsem.c

locking/rwsem: Set lock ownership ASAP

2015-02-18 16:57:13 +01:00

rwsem.h

locking/rwsem: Set lock ownership ASAP

2015-02-18 16:57:13 +01:00

semaphore.c

locking/semaphore: Resolve some shadow warnings

2014-09-04 07:17:24 +02:00

spinlock_debug.c

locking: Move the spinlock code to kernel/locking/

2013-11-06 07:55:21 +01:00

spinlock.c

spinlock: Add spin_lock_bh_nested()

2015-01-03 14:32:57 -05:00