atomic: fix a typo in atomic_long_xchg()
atomic_long_xchg() is not correctly defined for 32bit arches. Signed-off-by: NEric Dumazet <dada1@cosmosbay.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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