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authorLinus Torvalds <torvalds@linux-foundation.org>2008-05-12 13:34:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-12 13:34:13 -0700
commitc714a534d85576af21b06be605ca55cb2fb887ee (patch)
tree2d0501e6426b9e069082fd6f09da02c2334832e0
parent542dafadd81eb5826280f7714592930144ae3e1f (diff)
Make 'cond_resched()' nullification depend on PREEMPT_BKL
Because it's not correct with a non-preemptable BKL and just causes PREEMPT kernels to have longer latencies than non-PREEMPT ones (which is obviously not the point of it at all). Of course, that config option actually got removed as an option earlier, so for now this basically disables it entirely, but if BKL preemption is ever resurrected it will be a meaningful optimization. And in the meantime, it at least documents the intent of the code, while not doing the wrong thing. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/sched.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5a63f2d72af..5395a6176f4 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2038,7 +2038,7 @@ static inline int need_resched(void)
* cond_resched_softirq() will enable bhs before scheduling.
*/
extern int _cond_resched(void);
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPT_BKL
static inline int cond_resched(void)
{
return 0;