linux-kernel - Re: [BUG] Oops on boot (probably ACPI related)

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Message-ID: <p73k63pje1w.fsf@verdi.suse.de>
Date:	27 Sep 2006 21:38:03 +0200
From:	Andi Kleen <ak@...e.de>
To:	Rolf Eike Beer <eike-kernel@...tec.de>
Cc:	len.brown@...el.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: [BUG] Oops on boot (probably ACPI related)

Rolf Eike Beer <eike-kernel@...tec.de> writes:

> I get this on my machine. SMP kernel, linus git from this morning. .config and 
> test available on request.

What gcc do you use?

Anyways, does this patch fix it? This might have been Andrew's vaio problem too.

-Andi

i386: Use early clobbers for semaphores now

The new code does clobber the result early, so make sure to tell
gcc to not put it into the same register as a input argument

Signed-off-by: Andi Kleen <ak@...e.de>

Index: linux/include/asm-i386/semaphore.h
===================================================================
--- linux.orig/include/asm-i386/semaphore.h
+++ linux/include/asm-i386/semaphore.h
@@ -126,7 +126,7 @@ static inline int down_interruptible(str
 		"lea %1,%%eax\n\t"
 		"call __down_failed_interruptible\n"
 		"2:"
-		:"=a" (result), "+m" (sem->count)
+		:"=&a" (result), "+m" (sem->count)
 		:
 		:"memory");
 	return result;
@@ -148,7 +148,7 @@ static inline int down_trylock(struct se
 		"lea %1,%%eax\n\t"
 		"call __down_failed_trylock\n\t"
 		"2:\n"
-		:"=a" (result), "+m" (sem->count)
+		:"=&a" (result), "+m" (sem->count)
 		:
 		:"memory");
 	return result;
-
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