linux-kernel - [tip:perfcounters/urgent] perf report: Warn on callchain output request from non-callchain file

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Date:	Sun, 5 Jul 2009 09:51:51 GMT
From:	tip-bot for Frederic Weisbecker <fweisbec@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, anton@...ba.org, paulus@...ba.org,
	acme@...hat.com, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, jens.axboe@...cle.com,
	fweisbec@...il.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/urgent] perf report: Warn on callchain output request from non-callchain file

Commit-ID:  91b4eaea93f5be95f4477554399680a53aff2343
Gitweb:     http://git.kernel.org/tip/91b4eaea93f5be95f4477554399680a53aff2343
Author:     Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Sun, 5 Jul 2009 07:39:17 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 5 Jul 2009 10:30:21 +0200

perf report: Warn on callchain output request from non-callchain file

perf report segfaults while trying to handle callchains from a non
callchain data file.

Instead of a segfault, print a useful message to the user.

Reported-by: Jens Axboe <jens.axboe@...cle.com>
Reported-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Anton Blanchard <anton@...ba.org>
Cc: Jens Axboe <jens.axboe@...cle.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
LKML-Reference: <1246772361-9960-1-git-send-email-fweisbec@...il.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 tools/perf/builtin-report.c |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index fa937f5..9f9575a 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -1684,9 +1684,19 @@ static int __cmd_report(void)
 
 	sample_type = perf_header__sample_type();
 
-	if (sort__has_parent && !(sample_type & PERF_SAMPLE_CALLCHAIN)) {
-		fprintf(stderr, "selected --sort parent, but no callchain data\n");
-		exit(-1);
+	if (!(sample_type & PERF_SAMPLE_CALLCHAIN)) {
+		if (sort__has_parent) {
+			fprintf(stderr, "selected --sort parent, but no"
+					" callchain data. Did you call"
+					" perf record without -g?\n");
+			exit(-1);
+		}
+		if (callchain) {
+			fprintf(stderr, "selected -c but no callchain data."
+					" Did you call perf record without"
+					" -g?\n");
+			exit(-1);
+		}
 	}
 
 	if (load_kernel() < 0) {
--
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