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

From: Andi Kleen
Date: Wed Sep 27 2006 - 15:38:31 EST

Rolf Eike Beer <eike-kernel@xxxxxxxxx> 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.


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@xxxxxxx>

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"
- :"=a" (result), "+m" (sem->count)
+ :"=&a" (result), "+m" (sem->count)
return result;
@@ -148,7 +148,7 @@ static inline int down_trylock(struct se
"lea %1,%%eax\n\t"
"call __down_failed_trylock\n\t"
- :"=a" (result), "+m" (sem->count)
+ :"=&a" (result), "+m" (sem->count)
return result;
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at