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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 <[email protected]>
This commit is contained in:
Linus Torvalds 2008-05-11 16:04:48 -07:00
commit c3921ab715
3 changed files with 6 additions and 4 deletions
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2
fs/locks.c
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@ -773,7 +773,7 @@ static int flock_lock_file(struct file *filp, struct file_lock *request)
* give it the opportunity to lock the file.
*/
if (found)
cond_resched();
cond_resched_bkl();
find_conflict:
for_each_lock(inode, before) {