Messages in this thread |  | | Subject | Re: Pentium 4 and 2.4/2.5 | Date | Wed, 8 Nov 2000 18:21:54 +0000 (GMT) | From | Alan Cox <> |
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> > 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( "2:" "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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