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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-01-14 15:36:26 +0100
committerIngo Molnar <mingo@elte.hu>2009-01-14 18:09:00 +0100
commit41719b03091911028116155deddc5eedf8c45e37 (patch)
tree20a699807d78bc0af86b19443dc751415c0cc6f7 /kernel/mutex.h
parent93d81d1aca26e64a75d06a85f7e128b5f49053e7 (diff)
downloadop-kernel-dev-41719b03091911028116155deddc5eedf8c45e37.zip
op-kernel-dev-41719b03091911028116155deddc5eedf8c45e37.tar.gz
mutex: preemption fixes
The problem is that dropping the spinlock right before schedule is a voluntary preemption point and can cause a schedule, right after which we schedule again. Fix this inefficiency by keeping preemption disabled until we schedule, do this by explicity disabling preemption and providing a schedule() variant that assumes preemption is already disabled. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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