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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
