linux-kernel - [tip:perf/core] perf report: Fix a bug on "--call-graph none" option

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Date:	Sat, 3 Oct 2015 00:49:39 -0700
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	kan.liang@...el.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, hpa@...or.com, jolsa@...hat.com,
	a.p.zijlstra@...llo.nl, namhyung@...nel.org, mingo@...nel.org,
	acme@...hat.com
Subject: [tip:perf/core] perf report: Fix a bug on "--call-graph none"
  option

Commit-ID:  208e7607459477432d3df52c32d4b961a96d4a94
Gitweb:     http://git.kernel.org/tip/208e7607459477432d3df52c32d4b961a96d4a94
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Wed, 30 Sep 2015 13:34:00 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 1 Oct 2015 09:54:33 -0300

perf report: Fix a bug on "--call-graph none" option

The patch f9db0d0f1b2c ("perf callchain: Allow disabling call graphs
per event") added an ability to enable/disable callchain recording per
event.  But it had a problem when the enablement setting is changed at
'perf report' time using -g/--call-graph option.

For example, the following scenario will get a segfault.

  $ perf record -ag sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.500 MB perf.data (2555 samples) ]

  $ perf report -g none
  perf: Segmentation fault
  -------- backtrace --------
  perf[0x53a98a]
  /usr/lib/libc.so.6(+0x335af)[0x7f4e91df95af]

This is because callchain_param.sort() callback was not set but it
tried to call the function as it had the PERF_SAMPLE_CALLCHAIN bit.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Fixes: f9db0d0f1b2c ("perf callchain: Allow disabling call graphs per event")
Link: http://lkml.kernel.org/r/1443587640-24242-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 0cad9e0..c346b33 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1151,7 +1151,7 @@ void hists__output_resort(struct hists *hists, struct ui_progress *prog)
 	struct perf_evsel *evsel = hists_to_evsel(hists);
 	bool use_callchain;
 
-	if (evsel && !symbol_conf.show_ref_callgraph)
+	if (evsel && symbol_conf.use_callchain && !symbol_conf.show_ref_callgraph)
 		use_callchain = evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN;
 	else
 		use_callchain = symbol_conf.use_callchain;
--
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