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Everything that's actually common between 32 and 64-bit is moved into cmpxchg.h. xchg/cmpxchg will fail with a link error if they're passed an unsupported size (which includes 64-bit args on 32-bit systems). Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Link: http://lkml.kernel.org/r/4E5BCC40.3030501@goop.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>