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authorLinus Torvalds <torvalds@g5.osdl.org>2006-03-06 17:38:49 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-06 17:38:49 -0800
commit8ba7b0a14b2ec19583bedbcdbea7f1c5008fc922 (patch)
tree5047966d39ce26f7afd96b794dd4dc6a995458a5 /kernel/sched.c
parent91c0bce29e4050a59ee5fdc1192b60bbf8693a6d (diff)
downloadop-kernel-dev-8ba7b0a14b2ec19583bedbcdbea7f1c5008fc922.zip
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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/sched.c')
-rw-r--r--kernel/sched.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 12d291b..3454bb8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4028,6 +4028,8 @@ static inline void __cond_resched(void)
*/
if (unlikely(preempt_count()))
return;
+ if (unlikely(system_state != SYSTEM_RUNNING))
+ return;
do {
add_preempt_count(PREEMPT_ACTIVE);
schedule();
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