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authorOleg Nesterov <oleg@redhat.com>2010-03-15 10:10:23 +0100
committerIngo Molnar <mingo@elte.hu>2010-04-02 20:12:03 +0200
commit6a1bdc1b577ebcb65f6603c57f8347309bc4ab13 (patch)
tree516130eedf782dd14505bd111e06bcfad9923b07 /include/linux/cpuset.h
parent30da688ef6b76e01969b00608202fff1eed2accc (diff)
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sched: _cpu_down(): Don't play with current->cpus_allowed
_cpu_down() changes the current task's affinity and then recovers it at the end. The problems are well known: we can't restore old_allowed if it was bound to the now-dead-cpu, and we can race with the userspace which can change cpu-affinity during unplug. _cpu_down() should not play with current->cpus_allowed at all. Instead, take_cpu_down() can migrate the caller of _cpu_down() after __cpu_disable() removes the dying cpu from cpu_online_mask. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20100315091023.GA9148@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/cpuset.h')
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