linux-kernel - Re: [PATCH 17/39] clobber rbx in putuser

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Message-ID: <87abh5pxl6.fsf@basil.nowhere.org>
Date:	Sat, 28 Jun 2008 14:12:37 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Glauber Costa <gcosta@...hat.com>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	x86@...nel.org
Subject: Re: [PATCH 17/39] clobber rbx in putuser_64.S

Glauber Costa <gcosta@...hat.com> writes:

> Instead of clobbering r8, clobber rbx, which is the i386 way.

Note rbx is callee saved on 64bit, so using that one means
the surrounding function always has to save explicitely.
Not the case with r8.

There's a reason it is the way it is.

-Andi
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