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SubjectRe: scheduling problem?


On Fri, 17 Dec 1999, Andrea Arcangeli wrote:

> On Thu, 16 Dec 1999, Jamie Lokier wrote:
>
> > asm volatile("sti ; hlt" : : : "memory");
> ^^^^^^^^^
>
> The wakeup can still happen between sti and hlt so it doesn't fix the
> irq race condition.

Nope. Intel has a one-instruction delay after a sti. If the interrupt
comes in, it comes in "during" the hlt, and will cause the hlt to
complete.

Linus


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