Re: SMP syncronization on AMD processors (broken?)

[Christopher Friesen]

linux@xxxxxxxxxxx wrote:

> The right thing to do here is to wait for the flag to be set *outside*
> the lock, and then re-validate inside the lock:

This may work on some processors, but on others the read of "progress" 
in XXX, or the write in YYY may require arch-specific code to force the 
update out to other cpus.

Alternately, explicitly atomic operations should suffice, but a simple 
increment is probably not enough for portable code.

Chris
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