From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Thu, 15 Apr 2010 21:10:42 +0000 (+0200)
Subject: lockdep: Fix redundant_hardirqs_on incremented with irqs enabled
X-Git-Tag: v2.6.35-rc1~525^2~4^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8795d7717c467bea7b0a0649d44a258e09f34db2;p=pandora-kernel.git

lockdep: Fix redundant_hardirqs_on incremented with irqs enabled

When a path restore the flags while irqs are already enabled, we
update the per cpu var redundant_hardirqs_on in a racy fashion
and debug_atomic_inc() warns about this situation.

In this particular case, loosing a few hits in a stat is not a big
deal, so increment it without protection.

v2: Don't bother with disabling irq, we can miss one count in
    rare situations

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: David Miller <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

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