On (23/08/07 14:07), Andi Kleen didst pronounce:
> On Wed, Aug 22, 2007 at 11:10:29AM -0700, Andrew Morton wrote:
> > x86_64-mm-less-stack-alignment.patch has
> >
> > cflags-y += $(call cc-option,-mpreferred-stack-boundary=3)
> >
> > So we _should_ have detected that gcc didn't like =3, so it
> > should not have been used.
>
> The flag actually needs a recent gcc 4.3 snapshot (it's
> a new feature the gcc developers added especially for the
> kernel :), so if this didn't work it would fail on the vast
> majority of systems.
>
> Somehow it doesn't? At least here it compiles fine.
>
> I notice the final comma is missing, Mel does it work
> when you change the line to
>
> cflags-y += $(call cc-option,-mpreferred-stack-boundary=3,)
>
No but that is hardly a suprise as it's looking like -m64 is the way
forward.
> If not please run
> gcc -O2 -mpreferred-stack-boundary=2 -S -xc /dev/null -o x.o
> echo $?
>
> What does the echo output?
>
Repeating really but;
elm3b6:~# gcc -O2 -mpreferred-stack-boundary=2 -S -xc /dev/null -o x.o ; echo $?
0
elm3b6:~# gcc -m64 -O2 -mpreferred-stack-boundary=2 -S -xc /dev/null -o x.o ; echo $?
/dev/null:1: error: -mpreferred-stack-boundary=2 is not between 4 and 12
1
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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