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SubjectRe: 2.6.18-git7 freezes solid on boot
On Wed, 27 Sep 2006 12:31:52 +0000
"Alessandro Suardi" <alessandro.suardi@gmail.com> wrote:

> Dell D610 running FC5, works fine with -git5, locks up
> in less than a second after selecting the GRUB entry
> for -git7, with NumLock on and nothing else working,
> SysRq included, except for the power switch (no need
> to keep it down for 10 secs though - it powers off
> right away).
>
> Since bzdiffing patch-2.6.18-git5 and -git7 shows there
> are framebuffer changes, I'm wondering whether anyone
> had already stumbled into similar issues.
>
> Video card is an Intel i915GM.
>

You probably want this..

From: Andi Kleen <ak@suse.de>

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@suse.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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