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SubjectRe: [PATCH 0/24] make atomic_read() behave consistently across all architectures
Christoph Lameter writes:

> No it does not have any volatile semantics. atomic_dec() can be reordered
> at will by the compiler within the current basic unit if you do not add a
> barrier.

Volatile doesn't mean it can't be reordered; volatile means the
accesses can't be eliminated.

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