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

1 files changed, 13 insertions, 3 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index fa937f5c3c39..9f9575afab08 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) {