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

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Date:	Wed, 13 Aug 2008 12:44:49 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, 2008-08-12 at 20:49 -0700, Andrew Morton wrote:
> 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?

Hi, Andrew,

I think it is of no problem to replace xchg() with test_and_set_bit() or
spin_trylock().

Hi, Eric,

Do you have some reason to use xchg() instead of others?

Best Regards,
Huang Ying


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