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| author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-06 17:38:49 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-06 17:38:49 -0800 |
| commit | 8ba7b0a14b2ec19583bedbcdbea7f1c5008fc922 (patch) | |
| tree | 5047966d39ce26f7afd96b794dd4dc6a995458a5 /kernel/sched.c | |
| parent | 91c0bce29e4050a59ee5fdc1192b60bbf8693a6d (diff) | |
| download | lwn-8ba7b0a14b2ec19583bedbcdbea7f1c5008fc922.tar.gz lwn-8ba7b0a14b2ec19583bedbcdbea7f1c5008fc922.zip | |
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.c | 2 |
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) */ if (unlikely(preempt_count())) return; + if (unlikely(system_state != SYSTEM_RUNNING)) + return; do { add_preempt_count(PREEMPT_ACTIVE); schedule(); |