diff options
| author |   Waiman Long <Waiman.Long@hp.com> | 2015-07-11 21:19:19 -0400 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-07-21 10:18:07 +0200 |
| commit | cba77f03f2c7b6cc0b0a44a3c679e0abade7da62 (patch) | |
| tree | daba72ef7775e93627688ce9dd086a6e421c1feb /lib | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux (diff) | |
| download | linux-dev-cba77f03f2c7b6cc0b0a44a3c679e0abade7da62.tar.xz linux-dev-cba77f03f2c7b6cc0b0a44a3c679e0abade7da62.zip | |
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>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions