linux-kernel - Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?

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Message-ID: <20101115174449.GW29412@tyan-ft48-01.lab.bos.redhat.com>
Date:	Mon, 15 Nov 2010 18:44:49 +0100
From:	Jakub Jelinek <jakub@...hat.com>
To:	Jim Bos <jim876@...all.nl>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	James Cloos <cloos@...loos.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andreas Schwab <schwab@...hat.com>,
	Michael Matz <matz@...e.de>,
	Dave Korn <dave.korn.cygwin@...il.com>,
	Richard Guenther <richard.guenther@...il.com>, gcc@....gnu.org
Subject: Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?

On Mon, Nov 15, 2010 at 06:36:06PM +0100, Jim Bos wrote:
> On 11/15/2010 12:37 PM, Andi Kleen wrote:
> See attached, note this is the vanilla 2.6.36 i8k.c (without any patch).
> And to be 100% sure, if I build this (make drivers/char/i8k.ko) it won't
> work.
> 
> [ The i8k.i is rather big, even gzipped 80k, not sure if it'll bounce ]

Please also say which exact gcc you are using.

Note, I've compiled it with current 4.5 branch and made the function
always_inline and still didn't see any issues in the *.optimized dump,
regs.eax after the inline asm has always been compared to the constant
that has been stored into regs.eax before the inline asm.

	Jakub
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