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The check for overflow was originally in __hw_clock_source_read() If it got interrupted, it would frequently see an overflow, because "prev_read" would be less than "now". 1 - Use the comparator to check for overflow. 2 - Only check for overflow in the interrupt handler. BUG=chrome-os-partner:35312 BRANCH=none TEST=make buildall -j use the keyboard code to type use a console command "forcetime", to force the system time to overflow soon. Signed-off-by: Myles Watson <mylesgw@chromium.org> Change-Id: I7005724222289ba967e89af0ce8b9ef8f90a4ae4 Reviewed-on: https://chromium-review.googlesource.com/239967 Reviewed-by: Alec Berg <alecaberg@chromium.org> Tested-by: Myles Watson <mylesgw@chromium.org> Commit-Queue: Myles Watson <mylesgw@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org>