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authorPeter Zijlstra <peterz@infradead.org>2012-06-22 13:36:05 +0200
committerIngo Molnar <mingo@kernel.org>2012-07-24 13:58:20 +0200
commit8323f26ce3425460769605a6aece7a174edaa7d1 (patch)
tree44daa0dafa49cedc9301efd1417c6c2ac338c1c7 /arch/x86/kernel/apic/apic_numachip.c
parent88b8dac0a14c511ff41486b83a8c3d688936eec0 (diff)
sched: Fix race in task_group()
Stefan reported a crash on a kernel before a3e5d1091c1 ("sched: Don't call task_group() too many times in set_task_rq()"), he found the reason to be that the multiple task_group() invocations in set_task_rq() returned different values. Looking at all that I found a lack of serialization and plain wrong comments. The below tries to fix it using an extra pointer which is updated under the appropriate scheduler locks. Its not pretty, but I can't really see another way given how all the cgroup stuff works. Reported-and-tested-by: Stefan Bader <stefan.bader@canonical.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1340364965.18025.71.camel@twins Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/apic/apic_numachip.c')
0 files changed, 0 insertions, 0 deletions