linux-kernel - Re: [Bug 10489] Kprobe smoke test lockdep warning

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Date:	Tue, 22 Apr 2008 15:51:47 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Adrian Bunk <bunk@...nel.org>, ananth@...ibm.com,
	anil.s.keshavamurthy@...el.com, davem@...emloft.net,
	bugme-daemon@...zilla.kernel.org,
	jean-marc LACROIX <jeanmarc.lacroix@...e.Fr>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [Bug 10489] Kprobe smoke test lockdep warning

Masami Hiramatsu wrote:
> processor's IF bit is changed when an iret(q) is issued.
> In other words, when returning from a debug/int3 exception.

By the way, when returning from an exception on x86-64, it seems
paranoidexit@...ry_64.S doesn't use TRACE_IRQS_IRETQ except for
it executes swapgs, does it?

If not, I guess the lockdep on x86-64 may causes an warning
by below code:

spin_lock(...)
kprobe_target_function()
spin_unlock(...)

Thanks,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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