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Message-ID: <alpine.LFD.0.999.0707111059200.3412@woody.linux-foundation.org>
Date: Wed, 11 Jul 2007 11:01:54 -0700 (PDT)
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Martin Orr <martin@...tinorr.name>
cc: Andi Kleen <andi@...stfloor.org>, Stefano Rivoir <s.rivoir@....it>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.22 released
On Wed, 11 Jul 2007, Martin Orr wrote:
>
> I have done this. The file is arch/x86_64/kernel/signal.c: if I compile
> this with gcc 20070627 then everything works, if I compile it with gcc
> 20070707 then udevsettle hangs. This is independent of the gcc version used
> to compile the rest of the kernel. (The dates refer to versions of the
> Debian gcc-4.2 package and its dependencies.)
Can you do
make arch/x86_64/kernel/signal.s
with both compilers, and post the results somewhere? It's probably going
to be so large, and have so many trivial differences (register allocation
etc) that it will be hard-to-impossible to see the problem, but at least
we can *try* to see if it might be obvious enough from comparing the
assembly..
(Register allocation differences make comparisons like that really hard,
but if the two compiler versions are close enough, they *might* end up
having sufficiently similar register allocation that the stupid
differences don't hide all the real differences).
Linus
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