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

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Message-ID: <Pine.LNX.4.64.0710222137520.7105@anakin>
Date:	Mon, 22 Oct 2007 21:39:39 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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 Mon, 22 Oct 2007, Jens Axboe wrote:
> Change the page member of the scatterlist structure to be an unsigned
> long, and encode more stuff in the lower bits:
> 
> - Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located
>   at sg + 1.
> - Bit 0 set: this is a chain entry, the next real entry is at ->page_link
>   with the two low bits masked off.
> - Bit 1 set: this is the final entry in the sg entry. sg_next() will return
>   NULL when passed such an entry.

Better safe than sorry...

Is it possible that a chain entry pointer has bit 1 set on architectures
(e.g. m68k) where the natural alignment of 32-bit quantities is _2_ bytes,
not 4?

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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