[tip:perf/core] perf evlist: Add helper to check if attr.exclude_kernel is set in all evsels

[tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com>]

Commit-ID:  07d6f446a9e45b7e6e7438f8560e40d4dcfa0321
Gitweb:     https://git.kernel.org/tip/07d6f446a9e45b7e6e7438f8560e40d4dcfa0321
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Tue, 14 Nov 2017 11:01:06 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 16 Nov 2017 14:50:01 -0300

perf evlist: Add helper to check if attr.exclude_kernel is set in all evsels

The warning about kptr_restrict needs to be emitted only when it is set
and we ask for kernel space samples, so add a helper to help with that.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-fh7drty6yljei9gxxzer6eup@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/evlist.c | 12 ++++++++++++
 tools/perf/util/evlist.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index ccb749f..b62e523 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1786,3 +1786,15 @@ void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist,
 state_err:
 	return;
 }
+
+bool perf_evlist__exclude_kernel(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (!evsel->attr.exclude_kernel)
+			return false;
+	}
+
+	return true;
+}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index e72ae64..491f695 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -312,4 +312,6 @@ perf_evlist__find_evsel_by_str(struct perf_evlist *evlist, const char *str);
 
 struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
 					    union perf_event *event);
+
+bool perf_evlist__exclude_kernel(struct perf_evlist *evlist);
 #endif /* __PERF_EVLIST_H */