From: Peter Zijlstra Date: Thu, 15 May 2014 18:23:48 +0000 (+0200) Subject: perf: Limit perf_event_attr::sample_period to 63 bits X-Git-Tag: omap-for-v3.16/fixes-against-rc1~148^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0819b2e30ccb93edf04876237b6205eef84ec8d2;p=pandora-kernel.git perf: Limit perf_event_attr::sample_period to 63 bits Vince reported that using a large sample_period (one with bit 63 set) results in wreckage since while the sample_period is fundamentally unsigned (negative periods don't make sense) the way we implement things very much rely on signed logic. So limit sample_period to 63 bits to avoid tripping over this. Reported-by: Vince Weaver Signed-off-by: Peter Zijlstra Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/n/tip-p25fhunibl4y3qi0zuqmyf4b@git.kernel.org Signed-off-by: Thomas Gleixner --- Reading git-diff-tree failed