From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Date: Thu, 17 Apr 2014 08:17:12 +0000 (+0900)
Subject: kprobes, x86: Prohibit probing on debug_stack_*()
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~34^2~13^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f46efeb44e360b78f54a968b4d92e6877c35891;p=pandora-kernel.git

kprobes, x86: Prohibit probing on debug_stack_*()

Prohibit probing on debug_stack_reset and debug_stack_set_zero.
Since the both functions are called from TRACE_IRQS_ON/OFF_DEBUG
macros which run in int3 ist entry, probing it may cause a soft
lockup.

This happens when the kernel built with CONFIG_DYNAMIC_FTRACE=y
and CONFIG_TRACE_IRQFLAGS=y.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Seiji Aguchi <seiji.aguchi@hds.com>
Link: http://lkml.kernel.org/r/20140417081712.26341.32994.stgit@ltc230.yrl.intra.hitachi.co.jp
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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