From: Michael Ellerman Date: Fri, 14 Mar 2014 05:00:30 +0000 (+1100) Subject: powerpc/perf: Reject EBB events which specify a sample_type X-Git-Tag: v4.14-rc1~7796^2~23 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=58b5fb00498ddaaa3f6582751e9eb731189ee4c8;p=platform%2Fkernel%2Flinux-rpi.git powerpc/perf: Reject EBB events which specify a sample_type Although we already block EBB events which request sampling using sample_period, technically it's possible for an event to set sample_type but not sample_period. Nothing terrible will happen if an EBB event does specify sample_type, but it signals a major confusion on the part of userspace, and so we do them the favor of rejecting it. Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index 53ac1b2..1e095fd 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -503,8 +503,11 @@ static int ebb_event_check(struct perf_event *event) if (!leader->attr.pinned || !leader->attr.exclusive) return -EINVAL; - if (event->attr.inherit || event->attr.sample_period || - event->attr.enable_on_exec || event->attr.freq) + if (event->attr.freq || + event->attr.inherit || + event->attr.sample_type || + event->attr.sample_period || + event->attr.enable_on_exec) return -EINVAL; }