linux-kernel - Re: [V2 PATCH 1/3] x86/panic: Fix re-entrance problem due to panic on NMI

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Message-ID: <20150728080103.GD24972@dhcp22.suse.cz>
Date:	Tue, 28 Jul 2015 10:01:03 +0200
From:	Michal Hocko <mhocko@...nel.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>, linux-doc@...r.kernel.org,
	x86@...nel.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [V2 PATCH 1/3] x86/panic: Fix re-entrance problem due to panic
 on NMI

On Tue 28-07-15 11:02:11, Hidehiro Kawai wrote:
[...]
> > Something like
> [...]
> > +void nmi_panic(const char *fmt, ...)
> 
> Since we can't directly pass variable arguments to a subroutine,

Sure, I was just too lazy to finish this as it was just an illustration
of the idea.

> we have to use a macro or do like this:
> 
> void nmi_panic(const char *msg)
> {
> ...
> 	panic("%s", msg);
> }
> 
> If there is no objection, I'm going to use a macro.

Your other patch needs panic_cpu externally visible so the macro should
be OK.
-- 
Michal Hocko
SUSE Labs
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