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

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Message-ID: <Pine.LNX.4.64.0710241103000.5840@anakin>
Date:	Wed, 24 Oct 2007 11:03:43 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jens Axboe <jens.axboe@...cle.com>
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, 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()?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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