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Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  mutex: Fix optimistic spinning vs. BKL
This commit is contained in:
Linus Torvalds 2010-05-30 12:35:15 -07:00
parent bc7d352c5e fd6be105b8
commit fa7eadab4b
1 changed files with 7 additions and 0 deletions
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7
kernel/mutex.c
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@ -171,6 +171,13 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
for (;;) { for (;;) {
struct thread_info *owner; struct thread_info *owner;
/*
* If we own the BKL, then don't spin. The owner of
* the mutex might be waiting on us to release the BKL.
*/
if (unlikely(current->lock_depth >= 0))
break;
/* /*
* If there's an owner, wait for it to either * If there's an owner, wait for it to either
* release the lock or go to sleep. * release the lock or go to sleep.