linux-kernel - Re: block/bsg.c

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Message-ID: <20070717071952.GF5195@kernel.dk>
Date:	Tue, 17 Jul 2007 09:19:52 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: block/bsg.c

On Tue, Jul 17 2007, FUJITA Tomonori wrote:
> From: Jens Axboe <jens.axboe@...cle.com>
> Subject: Re: block/bsg.c
> Date: Tue, 17 Jul 2007 09:10:45 +0200
> 
> > On Tue, Jul 17 2007, FUJITA Tomonori wrote:
> > > From: Jens Axboe <jens.axboe@...cle.com>
> > > Subject: Re: block/bsg.c
> > > Date: Tue, 17 Jul 2007 08:59:40 +0200
> > > 
> > > > On Tue, Jul 17 2007, FUJITA Tomonori wrote:
> > > > > From: Jens Axboe <jens.axboe@...cle.com>
> > > > > Subject: Re: block/bsg.c
> > > > > Date: Tue, 17 Jul 2007 08:38:11 +0200
> > > > > 
> > > > > > On Mon, Jul 16 2007, Andrew Morton wrote:
> > > > > > > 
> > > > > > > A belated review (I've never seen this before and there it is in mainline)
> > > > > > > 
> > > > > > > > static char bsg_version[] = "block layer sg (bsg) 0.4";
> > > > > > > 
> > > > > > > `const' would be better.  That moves it into a write-protected memory section.
> > > > > > 
> > > > > > Agree
> > > > > > 
> > > > > > > > #define list_entry_bc(entry)	list_entry((entry), struct bsg_command, list)
> > > > > > > 
> > > > > > > This makes the code easier to write but harder to read.  We should optimise
> > > > > > > for readers.  Please open-code this at callsites.
> > > > > > > 
> > > > > > > Or at least convert it into a (commented) (possibly inlined) C function.
> > > > > > 
> > > > > > list_entry_to_bc(), then? The main objective is to save on typing, and
> > > > > > (just as important) make sure we don't bump over the 80 chars per line.
> > > > > > 
> > > > > > > > /*
> > > > > > > >  * just for testing
> > > > > > > >  */
> > > > > > > > #define BSG_MAJOR	(240)
> > > > > > > 
> > > > > > > What's this doing in mainline?  240 is a "reserved for local use" major. 
> > > > > > > This will cause collisions.  This code should be using dynamic major
> > > > > > > assignment.
> > > > > > 
> > > > > > Yeah, that's a big error on my part. Will get that fixed up right away.
> > > > > 
> > > > > I've been testing the patchset to fix the issues that Andrew pointed
> > > > > out. I can send it soon.
> > > > > 
> > > > > Jens, have you already fixed some?
> > > > 
> > > > I already pushed some of the changes locally, just the idr change is
> > > > missing. See the #bsg branch:
> > > > 
> > > > http://git.kernel.dk/?p=linux-2.6-block.git;a=shortlog;h=bsg
> > > 
> > > I see.
> > 
> > Since Linus is happily snoring by now, could you test and see if the
> > tree works for you?
> 
> Yeah, I'll do and send patches later if necessary.

Great, thanks.

-- 
Jens Axboe

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