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Add new 'cond_resched_bkl()' helper function

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It acts exactly like a regular 'cond_resched()', but will not get
optimized away when CONFIG_PREEMPT is set.

Normal kernel code is already preemptable in the presense of
CONFIG_PREEMPT, so cond_resched() is optimized away (see commit
02b67cc3ba "sched: do not do
cond_resched() when CONFIG_PREEMPT").

But when wanting to conditionally reschedule while holding a lock, you
need to use "cond_sched_lock(lock)", and the new function is the BKL
equivalent of that.

Also make fs/locks.c use it.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2008-05-11 16:04:48 -07:00
parent 9662369786
commit c3921ab715
3 changed files with 6 additions and 4 deletions
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2
kernel/sched.c
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@ -5525,7 +5525,6 @@ static void __cond_resched(void)
} while (need_resched());
}
#if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)
int __sched _cond_resched(void)
{
if (need_resched() && !(preempt_count() & PREEMPT_ACTIVE) &&
@ -5536,7 +5535,6 @@ int __sched _cond_resched(void)
return 0;
}
EXPORT_SYMBOL(_cond_resched);
#endif
/*
* cond_resched_lock() - if a reschedule is pending, drop the given lock,