perf report: Use a modifiable string for default callchain options

If the user doesn't provide options to tune his callchain output
(ie: if he uses -c without arguments) then the default value passed
in the OPT_CALLBACK_DEFAULT() macro is used.

But it's parsed later by strtok() which will replace comma separators
to a zero. This may segfault as we are using a read-only string.

Use a modifiable one instead, and also fix the "100%" default
minimum threshold value by turning it into a 0 (output every callchains)
as it was intended in the origin.

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: <1246772361-9960-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 9f9575afab08..3db99fd99867 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -58,6 +58,8 @@ static char		*parent_pattern = default_parent_pattern;
 static regex_t          parent_regex;
 
 static int              exclude_other = 1;
+
+static char             callchain_default_opt[] = "flat,0";
 static int              callchain;
 static enum chain_mode  callchain_mode;
 static double           callchain_min_percent = 0.0;
@@ -1871,7 +1873,7 @@ static const struct option options[] = {
                     "Only display entries with parent-match"),
         OPT_CALLBACK_DEFAULT('c', "callchain", NULL, "output_type,min_percent",
                      "Display callchains using output_type and min percent threshold. "
-                     "Default: flat,0", &parse_callchain_opt, "flat,100"),
+                     "Default: flat,0", &parse_callchain_opt, callchain_default_opt),
         OPT_STRING('d', "dsos", &dso_list_str, "dso[,dso...]",
                    "only consider symbols in these dsos"),
         OPT_STRING('C', "comms", &comm_list_str, "comm[,comm...]",