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SubjectRe: Possible race condition in i386 global_irq_lock handling.

> smb_rmb is enough in practice for x86 (in asm-i386), but not the right
> barrier in general because rmb only serializes reads against reads, so
> it would also make little sense while reading the i386 code. here you've
> to serialize a write against a read so it would be misleading unless you
> know exactly the lowlevel implementations of those barriers.
> smp_mb() before the while loop should be the correct barrier for all
> archs and the asm generated on x86 will be the same.
> alpha, ia64 and x86-64 (and probably others) needs it too.

Can some kind soul please provide me with the needed mini-patch. I would like
to try that on my constantly crashing SMP test box...

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