From: Eric Sandeen <sandeen@redhat.com>
Date: Tue, 16 Dec 2014 22:25:28 +0000 (-0600)
Subject: sched/debug: Check for stack overflow in ___might_sleep()
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~163^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a8b686b3af4419f92e0ea5be1c76fb68363df8e6;p=pandora-kernel.git

sched/debug: Check for stack overflow in ___might_sleep()

Sometimes a "BUG: sleeping function called from invalid context"
message is not indicative of locking problems, but is the result
of a stack overflow corrupting the thread info.

Witness http://oss.sgi.com/archives/xfs/2014-02/msg00325.html
for example, which took a few go-rounds to sort out.

If we're printing the warning, things are wonky already, and
it'd be informative to check for the stack end corruption at this
point, too.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/5490B158.4060005@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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