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This patch adds a new sysfs node (latency_hist) and reports IO (svc time) latency histograms. Disabled by default, can be enabled by echoing 0 into latency_hist, stats can be cleared by writing 2 into latency_hist. This commit fixes the 32 bit build breakage in the previous commit. Tested on both 32 bit and 64 bit arm devices. (Merged from android4.4-common). Bug: 30677035 Change-Id: I9403ea093f4cd54ebae08f12a11d01ef153118d0 Signed-off-by: Mohan Srinivasan <srmohan@google.com>