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The new cacheflush.h API's didn't have any comments describing how they're to be used yet and the conventions around these functions. This patch adds comments to this effect; in order for that to be a logical series, some prototypes had to move around. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>