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

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Date:	Sat, 18 Aug 2007 20:07:32 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
cc:	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 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.

(Sorry for butting in), but I wonder if relying on that in code here
(granted, a PS3-only driver, but it's in drivers/ and not arch/) would
be good style. Why not just print it out as: "%llu" and use an (unsigned
long long) cast, considering that's the largest type sector_t can ever
have (irrespective of arch) ... I can see most of the other generic places
in the kernel (such as in drivers/md/) also using the latter (%llu with
unsigned long long cast) to get bi_sector printed.
-
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