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authorIngo Molnar <mingo@elte.hu>2006-12-29 16:48:13 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-30 10:56:41 -0800
commit9414232fa0cc28e2f51b8c76d260f2748f7953fc (patch)
tree71717c2907f4fe2f50aba355e8cf03f3a2a8b385 /drivers/macintosh
parentd449db98d5d7d90f29f9f6e091b0e1d996184df1 (diff)
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[PATCH] sched: fix cond_resched_softirq() offset
Remove the __resched_legal() check: it is conceptually broken. The biggest problem it had is that it can mask buggy cond_resched() calls. A cond_resched() call is only legal if we are not in an atomic context, with two narrow exceptions: - if the system is booting - a reacquire_kernel_lock() down() done while PREEMPT_ACTIVE is set But __resched_legal() hid this and just silently returned whenever these primitives were called from invalid contexts. (Same goes for cond_resched_locked() and cond_resched_softirq()). Furthermore, the __legal_resched(0) call was buggy in that it caused unnecessarily long softirq latencies via cond_resched_softirq(). (which is only called from softirq-off sections, hence the code did nothing.) The fix is to resurrect the efficiency of the might_sleep checks and to only allow the narrow exceptions. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/macintosh')
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