tree 50a6c8e1d86c38fff417907d821eec0e0731e1a5
parent 73e753a50dcac7d6d4fa8b9552203ef544a70d77
author Gautham R Shenoy <ego@in.ibm.com> 1192776047 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1192820024 -0700

Add irq protection in the percpu-counters cpu-hotplug-callback path

Some of the per-cpu counters and thus their locks are accessed from IRQ
contexts.  This can cause a deadlock if it interrupts a cpu-offline thread
which is transferring a dead-cpu's counts to the global counter.

Add appropriate IRQ protection in the cpu-hotplug callback path.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>