linux-kernel - Re: x86: get rid of the insane TIF_ABI

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Date:	Mon, 15 Feb 2010 12:43:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Roland McGrath <roland@...hat.com>
CC:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: x86: get rid of the insane TIF_ABI_PENDING bit

On 02/15/2010 11:41 AM, Roland McGrath wrote:
> It affects whatever uses is_compat_task(), but I can't see anything
> where that matters except inside some particular syscall or for
> syscall restart after signals.

FWIW, the origin of this is checkin
4d9bc79cd28b779610d9590b3a96a28a0f64a25a (2.6.18-rc1), which somewhat
unhelpfully states "Make sure is_compat_task works early".  It doesn't
specify what the failure is if is_compat_task doesn't work early.  On
the other hand, it sure as heck seems better to set it and not need it
than the other way around.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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