linux-kernel - Re: [PATCH 2/2] fork: avoid weak function arch_dup_task

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Message-Id: <20110501171149.9a9342fc.akpm@linux-foundation.org>
Date:	Sun, 1 May 2011 17:11:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Hans Rosenfeld <hans.rosenfeld@....com>, brgerst@...il.com,
	tglx@...utronix.de, mingo@...e.hu, suresh.b.siddha@...el.com,
	eranian@...gle.com, robert.richter@....com,
	Andreas.Herrmann3@....com, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] fork: avoid weak function arch_dup_task_struct

On Sun, 01 May 2011 15:59:12 -0700 "H. Peter Anvin" <hpa@...or.com> wrote:

> On 05/01/2011 12:25 PM, Andrew Morton wrote:
> > On Wed, 27 Apr 2011 16:26:35 +0200 Hans Rosenfeld <hans.rosenfeld@....com> wrote:
> > 
> >> Avoid potential gcc bug by not using a weak function for
> >> arch_dup_task_struct. Use an #ifdef'ed static function for
> >> archs that don't have a special arch_dup_task_struct implementation.
> > 
> > The patch is unreviewable (and hence unusable) if you don't describe
> > this "potential gcc bug".
> >
> 
> http://lkml.indiana.edu/hypermail/linux/kernel/0804.3/3202.html
> 

gcc-4.1.0 and 4.1.1 were explicitly banned via a test in
include/linux/compiler-gcc4.h for this reason.

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