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This was causing the destination instead of the source to be filled. As a result, the source was typically all mapped to one zero page, and hence very cacheable. Signed-off-by: Bruce Merry <[email protected]> Acked-by: Ingo Molnar <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/20150115092022.GA11292@kryton Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>