In preparation for the introduction of a generic swap() macro.
Signed-off-by: NWu Fengguang <fengguang.wu@intel.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>