linux-kernel - Re: -mm merge plans for 2.6.21

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Date:	Sun, 11 Feb 2007 16:09:42 +0000
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	linux-mips@...ux-mips.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...nvz.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: -mm merge plans for 2.6.21

On Sun, Feb 11, 2007 at 04:33:41PM +0100, David Woodhouse wrote:

> On Sat, 2007-02-10 at 21:34 +0000, Ralf Baechle wrote:
> > Unfortunately struct epoll_event contains a gap so it bets on identical
> > padding rules between native and compat ABI and anyway, padding is wasted
> > space so the struct members should have been swapped when this structure
> > was created.  Oh well, too late. 
> 
> Indeed. That was the example I was thinking of when I suggested the "no
> new syscalls without _simultaneous_ compat version" rule.

The need for a compat ABI is not always obvious.

  Ralf
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