linux-kernel - Re: [PATCH -v3 1/7] kexec jump: clean up #ifdef and comments

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Message-Id: <20080812204900.db63deaa.akpm@linux-foundation.org>
Date:	Tue, 12 Aug 2008 20:49:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	"Rafael J. Wysocki" <rjw@...k.pl>, Vivek Goyal <vgoyal@...hat.com>,
	mingo@...e.hu, Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH -v3 1/7] kexec jump: clean up #ifdef and comments

On Tue, 12 Aug 2008 11:14:21 +0800 Huang Ying <ying.huang@...el.com> wrote:

>  	xchg(&kexec_lock, 0);

kernel/kexec.c: In function 'kernel_kexec':
kernel/kexec.c:1501: warning: value computed is not used

Is there any reason why we cannot use the more conventional
test_and_set_bit() etc, rather than this peculiarity?

Or perhaps spin_trylock?
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