[tip:perf/urgent] perf script: Check if evsel has callchains before trying to use it

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  b879833cbaac85b1437f574791b8855d26b0dc80
Gitweb:     https://git.kernel.org/tip/b879833cbaac85b1437f574791b8855d26b0dc80
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Mon, 4 Jun 2018 10:34:20 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 5 Jun 2018 10:09:54 -0300

perf script: Check if evsel has callchains before trying to use it

We were checking just if callchain processing was asked for by the
user, not if the evsel itself has callchains, and since we can have
some evsels with callchains and others without, check that.

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-inxl7k49q9f9w1se039fbxuw@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-script.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 48e940efb3cb..b3bf35512d21 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -606,7 +606,7 @@ static int perf_sample__fprintf_start(struct perf_sample *sample,
 	if (PRINT_FIELD(COMM)) {
 		if (latency_format)
 			printed += fprintf(fp, "%8.8s ", thread__comm_str(thread));
-		else if (PRINT_FIELD(IP) && symbol_conf.use_callchain)
+		else if (PRINT_FIELD(IP) && evsel__has_callchain(evsel) && symbol_conf.use_callchain)
 			printed += fprintf(fp, "%s ", thread__comm_str(thread));
 		else
 			printed += fprintf(fp, "%16s ", thread__comm_str(thread));