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SubjectRe: spin_lock forgets to clobber memory and other smp fixes [was
Date
Hello!

> Well, now GCC does CSE across "asm" and will eliminate memory loads,
> even though it may not move them! I suspect it always did CSE across
> "asm" and we just never got hit by the bug.

dummy_lock trick is equivalent to "memory" clobber.

So that there is no real bug.

Alexey
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