linux-kernel - Re: [PATCH 09/10] Change table chaining layout

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Date:	Wed, 24 Oct 2007 11:12:42 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	mingo@...e.hu, Linux/m68k <linux-m68k@...r.kernel.org>
Subject: Re: [PATCH 09/10] Change table chaining layout

On Wed, Oct 24 2007, Geert Uytterhoeven wrote:
> On Wed, 24 Oct 2007, Jens Axboe wrote:
> > On Tue, Oct 23 2007, Linus Torvalds wrote:
> > > My biggest complaint right now is that a lot of users of the sg *filling* 
> > > functions were mindlessly converted, so we have code like
> > > 
> > > 	cryptoloop.c:             sg_set_page(&sg_in, in_page);
> > > 	cryptoloop.c:             sg_in.offset = in_offs;
> > > 	cryptoloop.c:             sg_in.length = sz;
> > > 
> > > which is just really stupid, and we should have a function for that. But 
> > > worse is code like this:
> > > 
> > > 	ub.c:     sg_set_page(sg, virt_to_page(sc->top_sense));
> > > 	ub.c:     sg->offset = (unsigned long)sc->top_sense & (PAGE_SIZE-1);
> > > 	ub.c:     sg->length = UB_SENSE_SIZE;
> > > 
> > > which again was converted "line by line" and we actually *do* have a 
> > > function to do the above three lines as
> > > 
> > > 	sg_set_buf(sg, sc->top_sense, UB_SENSE_SIZE);
> > > 
> > > where that *single* line is just tons shorter but more importantly, more 
> > > readable, than the mess that is a brute-force conversion.
> > 
> > I modified sg_set_page() to take a length and offset argument, and
> 
> As it no longer sets the page only, perhaps it's a good idea to rename
> sg_set_page() to sg_set()?

sg_set_buf() also sets length and offset, sg_set_page() is just a mirror
of that. So I'd prefer to keep the naming.

-- 
Jens Axboe

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