linux-kernel - Re: Kernel Bug in 2.4.35 when compiled gcc>=4.2.0 and -march=c3

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Message-Id: <44e819389656d1465e70ce2e99fb7640@kernel.crashing.org>
Date:	Mon, 6 Aug 2007 15:05:29 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Willy Tarreau <w@....eu>
Cc:	Axel Reinhold <axel@...akout.de>, linux-kernel@...r.kernel.org
Subject: Re: Kernel Bug in 2.4.35 when compiled gcc>=4.2.0 and -march=c3

> I still
> suspect that because the behaviour is different between 4.1 and 4.2, it
> might be a regression in 4.2,

The kernel code is wrong.  It might have accidentally worked
with GCC-4.1, but that doesn't mean GCC-4.2 has regressed.
Only supported features that stop working are regressions;
invalid code that stops working is, well, in the worst case
an improvement in diagnostics ;-)


Segher

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