linux-kernel - Re: [PATCH 2/2] kernel/{exit.c, signal.c, power/process.c}: replace !likely(x) by likely(!x)

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Message-ID: <47B7B518.7060509@keyaccess.nl>
Date:	Sun, 17 Feb 2008 05:16:24 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Roel Kluin <12o3l@...cali.nl>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] kernel/{exit.c, signal.c, power/process.c}: replace
 !likely(x) by likely(!x)

On 17-02-08 04:56, H. Peter Anvin wrote:

> Rene Herman wrote:
>> On 16-02-08 20:01, H. Peter Anvin wrote:
>>> Roel Kluin wrote:
>>>> Not entirely sure who to send this to
>>>> ---
>>>> Replace !likely(x) by likely(!x)
>>>
>>> Whoa...
>>>
>>> Are you sure this is correct?
>>>
>>> !likely(x) is equivalent to unlikely(!x)
>>
>> Not with respect to its value I believe? likely(x) == !!(x), and 
>> unlikely(!x) == !!(!x) = !x, so conditions work out differently?
> 
> You missed one ! sign:
> 
> !likely(x) == !!!(x) == unlikely(!x) == !!(!(x))

Yup, sorry, misread.

Rene.
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