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

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Message-ID: <20071022224343.4abf3c96@the-village.bc.nu>
Date:	Mon, 22 Oct 2007 22:43:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	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 13:44:43 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Mon, 22 Oct 2007, Alan Cox wrote:
> > 
> > Why can't we just make the list one item longer than the entry count and
> > stick a NULL on the end of it like normal people ? Then you need one bit
> > which ought to be safe for everyone (and if the bit is a macro any CPU
> > warped enough to have byte alignment is surely going to have top bits
> > spare...)
> 
> Well, quite frankly, equally easy is to just add a
> 
> 	__attribute__((aligned(4)))
> 
> or whatever the gcc syntax for that is today.. That guarantees that gcc 
> lays things out properly.

For structures, not array elements or stack objects. Does gcc now get
aligned correct as an attribute on a stack object ?

Still doesn't answer the rather more important question - why not just
stick a NULL on the end instead of all the nutty hacks ?
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