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

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Message-Id: <1171103527.29713.228.camel@pmac.infradead.org>
Date:	Sat, 10 Feb 2007 10:32:07 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>, ralf@...ux-mips.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 Sat, 2007-02-10 at 11:22 +0100, Heiko Carstens wrote:
> Which remembers me that I think that MIPS is using the non-compat version
> of sys_epoll_pwait for compat syscalls. But maybe MIPS doesn't need a compat
> syscall for some reason. Dunno. 

It's OK as long as the 64-bit kernel, N32 and O32 userspace all agree
there there's 32 bits of padding between the fields of this structure:

struct epoll_event {
        __u32 events;
        __u64 data;
};

I suspect it's a fairly safe bet that N32 userspace agrees; if the O32
ABI is different then it would need the compat syscall.

-- 
dwmw2

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