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SubjectRe: Pentium 4 and 2.4/2.5
> > 		asm volatile("rep ; nop");
> >
> > (there's not much a "rep nop" _can_ do, after all - the most likely CPU
> > extension would be to raise an "Illegal Opcode" fault).
> Just for the curious, this works on Athlons. :)

What state does it leave the condition codes ? That matters.

Take for example

if (!oldval)
asm volatile(
"cmpl $-1, %0;"
"rep; nop;"
"je 2b;"
: :"m" (current->need_resched));

When running SMP with poll_idle enabled. I can't see it changing condition
codes on an athlon but..

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