linux-kernel - Re: [PATCH v2 8/9] bfs: remove multiple assignments

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Message-ID: <479BC6E5.5000409@gmail.com>
Date:	Sun, 27 Jan 2008 02:48:53 +0300
From:	Dmitri Vorobiev <dmitri.vorobiev@...il.com>
To:	Tigran Aivazian <tigran@...azian.fsnet.co.uk>
CC:	trivial@...nel.org, linux-fsdevel@...r.kernel.org,
	apw@...dowen.org, rdunlap@...otime.net, jschopp@...tin.ibm.com,
	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 8/9] bfs: remove multiple assignments

Tigran Aivazian wrote:
> On Sat, 26 Jan 2008, Dmitri Vorobiev wrote:
>> -    inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
>> +    inode->i_mtime = CURRENT_TIME_SEC;
>> +    inode->i_atime = CURRENT_TIME_SEC;
>> +    inode->i_ctime = CURRENT_TIME_SEC;
> 
> multiple assignments like "x = y = z = value;" can potentially
> (depending on the compiler and arch) be faster than "x = value; y =
> value; z=value;"
> 
> I am surprized that this script complains about them as it is a
> perfectly valid thing to do in C.

I think it seems wise to ask the maintainers of checkpatch.pl to
comment on that. I'm Cc:ing them now.

Thanks,

Dmitri

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