Commit-ID: 18e7a45af91acdde99d3aa1372cc40e1f8142f7b Gitweb: http://git.kernel.org/tip/18e7a45af91acdde99d3aa1372cc40e1f8142f7b Author: Jiri Olsa <jo...@redhat.com> AuthorDate: Tue, 3 Jan 2017 15:24:54 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Sat, 14 Jan 2017 11:06:50 +0100
perf/x86: Reject non sampling events with precise_ip As Peter suggested [1] rejecting non sampling PEBS events, because they dont make any sense and could cause bugs in the NMI handler [2]. [1] http://lkml.kernel.org/r/20170103094059.GC3093@worktop [2] http://lkml.kernel.org/r/1482931866-6018-3-git-send-email-jo...@kernel.org Signed-off-by: Jiri Olsa <jo...@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Arnaldo Carvalho de Melo <a...@kernel.org> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Jiri Olsa <jo...@kernel.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stephane Eranian <eran...@google.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Vince Weaver <vi...@deater.net> Cc: Vince Weaver <vincent.wea...@maine.edu> Link: http://lkml.kernel.org/r/20170103142454.GA26251@krava Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/events/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 019c588..1635c0c 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -505,6 +505,10 @@ int x86_pmu_hw_config(struct perf_event *event) if (event->attr.precise_ip > precise) return -EOPNOTSUPP; + + /* There's no sense in having PEBS for non sampling events: */ + if (!is_sampling_event(event)) + return -EINVAL; } /* * check that PEBS LBR correction does not conflict with
