linux-kernel - Re: [V5 PATCH 1/4] panic/x86: Fix re-entrance problem due to panic on NMI

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Message-ID: <20151124101218.6518a664@gandalf.local.home>
Date:	Tue, 24 Nov 2015 10:12:18 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	Jonathan Corbet <corbet@....net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vivek Goyal <vgoyal@...hat.com>, Baoquan He <bhe@...hat.com>,
	linux-doc@...r.kernel.org, x86@...nel.org,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Michal Hocko <mhocko@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [V5 PATCH 1/4] panic/x86: Fix re-entrance problem due to panic
 on NMI

On Tue, 24 Nov 2015 10:05:10 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> cmpxchg(&panic_cpu, -1, 0) != 0
> 
> returns -1 for cpu 0, thus 0 != 0, and sets panic_cpu to 0

That was suppose to be "thus -1 != 0".

-- Steve
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