[tip:perf/urgent] perf hists: Introduce hist_entry__has_callchain() method

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  0b5d6ece5e6a8b45c4ebbaaf831675b5b605850f
Gitweb:     https://git.kernel.org/tip/0b5d6ece5e6a8b45c4ebbaaf831675b5b605850f
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 29 May 2018 13:28:24 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 6 Jun 2018 12:51:46 -0300

perf hists: Introduce hist_entry__has_callchain() method

We'll use this helper more frequently when reworking
symbol_conf.use_callchain logic, where knowing if a hist_entry has
callchains is the important bit, so make going from hist_entry to hists
to evsel easier, compact.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-p6gioxkzpkpz71dtt4wcs36o@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/sort.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index f007a26d6f6d..1a046157bfef 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -151,6 +151,12 @@ struct hist_entry {
 	struct callchain_root	callchain[0]; /* must be last member */
 };
 
+static __pure inline bool hist_entry__has_callchains(struct hist_entry *he)
+{
+	const struct perf_evsel *evsel = hists_to_evsel(he->hists);
+	return evsel__has_callchain(evsel);
+}
+
 static inline bool hist_entry__has_pairs(struct hist_entry *he)
 {
 	return !list_empty(&he->pairs.node);