From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Sergio Aguirre <saaguirre@ti.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Huang Ying <ying.huang@intel.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Ingo Molnar <mingo@elte.hu>, Kyle McMartin <kyle@mcmartin.ca>
Subject: Re: [RFC][PATCH] irq_work: Don't ignore possible cmpxchg failure
Date: Tue, 16 Nov 2010 17:45:01 +0100 [thread overview]
Message-ID: <1289925901.2109.629.camel@laptop> (raw)
In-Reply-To: <1289925179-17085-1-git-send-email-saaguirre@ti.com>
On Tue, 2010-11-16 at 10:32 -0600, Sergio Aguirre wrote:
> Although is very unlikely, it's better to make sure we're not
> letting this happen.
>
> This solves this compilation warning:
>
> kernel/irq_work.c: In function 'irq_work_run':
> kernel/irq_work.c:148: warning: value computed is not used
>
> @@ -145,7 +145,10 @@ void irq_work_run(void)
> * Clear the BUSY bit and return to the free state if
> * no-one else claimed it meanwhile.
> */
> - cmpxchg(&entry->next, next_flags(NULL, IRQ_WORK_BUSY), NULL);
> + xchgres = cmpxchg(&entry->next,
> + next_flags(NULL, IRQ_WORK_BUSY),
> + NULL);
> + BUG_ON(unlikely(xchgres != next_flags(NULL, IRQ_WORK_BUSY)));
simply adding (void) in front would be much easier.
next prev parent reply other threads:[~2010-11-16 16:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-16 16:32 [RFC][PATCH] irq_work: Don't ignore possible cmpxchg failure Sergio Aguirre
2010-11-16 16:45 ` Peter Zijlstra [this message]
2010-11-16 16:57 ` Aguirre, Sergio
2010-11-16 17:08 ` Peter Zijlstra
2010-11-16 17:11 ` Aguirre, Sergio
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