linux-kernel - Re: [PATCH] [20/45] x86_64: Use 8 byte stack alignment when possible

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Message-ID: <20070921211341.GC8127@redhat.com>
Date:	Fri, 21 Sep 2007 17:13:41 -0400
From:	Dave Jones <davej@...hat.com>
To:	Andi Kleen <ak@...e.de>
Cc:	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [20/45] x86_64: Use 8 byte stack alignment when
	possible

On Fri, Sep 21, 2007 at 10:45:02PM +0200, Andi Kleen wrote:
 > 
 > Kernel doesn't use SSE2, so it doesn't need 16 byte alignment. Also
 > the stack can be already unaligned so letting the compiler align
 > is useless. This may make some stack frames smaller.
 > Only works with very recent gcc 4.3

My gcc 4.1.2 from Fedora 7 (with who knows what backported)
references this in its manpage. How was it broken before 4.3 ?
(I'm curious if I'll suddenly see not expected behaviour with
 this change with that compiler).

	Dave

-- 
http://www.codemonkey.org.uk
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