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The value of IbsOpCurCnt rolls over when it reaches IbsOpMaxCnt. Thus, it is reset to zero by hardware. To get the correct count we need to add the max count to it in case we received an ibs sample (valid bit set). Signed-off-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1333390758-10893-13-git-send-email-robert.richter@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>