linux-kernel - Re: [RFC][PATCH 02/10] mm: Remove likely() from mapping

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Date:	Fri, 10 Dec 2010 17:08:05 +0900
From:	Miles Bader <miles@....org>
To:	Joe Perches <joe@...ches.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>
Subject: Re: [RFC][PATCH 02/10] mm: Remove likely() from mapping_unevictable()

Joe Perches <joe@...ches.com> writes:
> It'd be better to use
>
> 	if (!mapping)
> 		return 0;
> 	return test_bit(AS_UNEVICTABLE, &mapping->flags);
>
> to avoid the unnecessary !!

How about 

 	return mapping && test_bit(AS_UNEVICTABLE, &mapping->flags);

instead...?

-miles

-- 
Yossarian was moved very deeply by the absolute simplicity of
this clause of Catch-22 and let out a respectful whistle.
"That's some catch, that Catch-22," he observed.
"It's the best there is," Doc Daneeka agreed.
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