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

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Message-ID: <20150723081528.GG25159@twins.programming.kicks-ass.net>
Date:	Thu, 23 Jul 2015 10:15:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	Jonathan Corbet <corbet@....net>, 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: [PATCH 1/3] x86/panic: Fix re-entrance problem due to panic on
 NMI

On Wed, Jul 22, 2015 at 11:14:21AM +0900, Hidehiro Kawai wrote:
> +DEFINE_SPINLOCK(panic_lock);

At the very least this should be a raw spinlock, but wth aren't you
using a simple atomic_xchg() ?
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