From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Date: Mon, 4 Aug 2014 03:10:16 +0000 (+0000)
Subject: kprobes: Skip kretprobe hit in NMI context to avoid deadlock
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~17^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f96f56780ca584930bb3a2769d73fd9a101bcbbe;p=pandora-kernel.git

kprobes: Skip kretprobe hit in NMI context to avoid deadlock

Skip kretprobe hit in NMI context, because if an NMI happens
inside the critical section protected by kretprobe_table.lock
and another(or same) kretprobe hit, pre_kretprobe_handler
tries to lock kretprobe_table.lock again.
Normal interrupts have no problem because they are disabled
with the lock.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20140804031016.11433.65539.stgit@kbuild-fedora.novalocal
[ Minor edits for clarity. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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