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authorLinus Torvalds <torvalds@g5.osdl.org>2006-03-06 20:38:49 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-06 20:38:49 -0500
commit8ba7b0a14b2ec19583bedbcdbea7f1c5008fc922 (patch)
tree5047966d39ce26f7afd96b794dd4dc6a995458a5 /kernel
parent91c0bce29e4050a59ee5fdc1192b60bbf8693a6d (diff)
Add early-boot-safety check to cond_resched()
Just to be safe, we should not trigger a conditional reschedule during the early boot sequence. We've historically done some questionable early on, and the safety warnings in __might_sleep() are generally turned off during that period, so there might be problems lurking. This affects CONFIG_PREEMPT_VOLUNTARY, which takes over might_sleep() to cause a voluntary conditional reschedule. Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 12d291bf3379..3454bb869fd0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4028,6 +4028,8 @@ static inline void __cond_resched(void)
4028 */ 4028 */
4029 if (unlikely(preempt_count())) 4029 if (unlikely(preempt_count()))
4030 return; 4030 return;
4031 if (unlikely(system_state != SYSTEM_RUNNING))
4032 return;
4031 do { 4033 do {
4032 add_preempt_count(PREEMPT_ACTIVE); 4034 add_preempt_count(PREEMPT_ACTIVE);
4033 schedule(); 4035 schedule();