Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
 "Misc fixlets from all around the place"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/uncore: Fix IVT/SNB-EP uncore CBOX NID filter table
  perf/x86: Correctly use FEATURE_PDCM
  perf, nmi: Fix unknown NMI warning
  perf trace: Fix ioctl 'request' beautifier build problems on !(i386 || x86_64) arches
  perf trace: Add fallback definition of EFD_SEMAPHORE
  perf list: Fix checking for supported events on older kernels
  perf tools: Handle PERF_RECORD_HEADER_EVENT_TYPE properly
  perf probe: Do not add offset twice to uprobe address
  perf/x86: Fix Userspace RDPMC switch
  perf/x86/intel/p6: Add userspace RDPMC quirk for PPro

1 files changed, 15 insertions, 2 deletions

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index d248fca6d7ed..1e15df10a88c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1091,12 +1091,12 @@ int is_valid_tracepoint(const char *event_string)
 static bool is_event_supported(u8 type, unsigned config)
 {
 	bool ret = true;
+	int open_return;
 	struct perf_evsel *evsel;
 	struct perf_event_attr attr = {
 		.type = type,
 		.config = config,
 		.disabled = 1,
-		.exclude_kernel = 1,
 	};
 	struct {
 		struct thread_map map;
@@ -1108,7 +1108,20 @@ static bool is_event_supported(u8 type, unsigned config)
 
 	evsel = perf_evsel__new(&attr);
 	if (evsel) {
-		ret = perf_evsel__open(evsel, NULL, &tmap.map) >= 0;
+		open_return = perf_evsel__open(evsel, NULL, &tmap.map);
+		ret = open_return >= 0;
+
+		if (open_return == -EACCES) {
+			/*
+			 * This happens if the paranoid value
+			 * /proc/sys/kernel/perf_event_paranoid is set to 2
+			 * Re-run with exclude_kernel set; we don't do that
+			 * by default as some ARM machines do not support it.
+			 *
+			 */
+			evsel->attr.exclude_kernel = 1;
+			ret = perf_evsel__open(evsel, NULL, &tmap.map) >= 0;
+		}
 		perf_evsel__delete(evsel);
 	}