linux-kernel - Re: [PATCH 002 of 6] Introduce rq_for_each_segment replacing rq_for_each

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Message-ID: <Pine.LNX.4.64.0708181628350.5186@fbirervta.pbzchgretzou.qr>
Date:	Sat, 18 Aug 2007 16:30:44 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Satyam Sharma <satyam@...radead.org>
cc:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	NeilBrown <neilb@...e.de>, Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Tejun Heo <htejun@...il.com>,
	Cell Broadband Engine OSS Development 
	<cbe-oss-dev@...abs.org>
Subject: Re: [PATCH 002 of 6] Introduce rq_for_each_segment replacing
 rq_for_each_bio


On Aug 18 2007 20:07, Satyam Sharma wrote:
>On Fri, 17 Aug 2007, Geert Uytterhoeven wrote:
>
>> On Thu, 16 Aug 2007, NeilBrown wrote:
>> [...]
>> >  		dev_dbg(&dev->sbd.core,
>> >  			"%s:%u: bio %u: %u segs %u sectors from %lu\n",
>> > -			__func__, __LINE__, i, bio_segments(bio),
>> > -			bio_sectors(bio), sector);
>> > -		bio_for_each_segment(bvec, bio, j) {
>> > +			__func__, __LINE__, i, bio_segments(iter.bio),
>> > +			bio_sectors(iter.bio),
>> > +			(unsigned long)iter.bio->bi_sector);
>>                         ^^^^^^^^^^^^^^^
>> Superfluous cast: PS3 is 64-bit only, and casts are evil.

bi_sector is sector_t. The cast is ok, because printf will warn, and rightfully
so since sector_t may just change its shape underneath. It would not be so much
of a problem if printf() was not a varargs function, but it is, and hence,
passing an object bigger than the format specifier can make problems.


	Jan
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