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Subject[PATCH] Fix old GCC build error in perf/util/trace-event-parse.c:parse_proc_kallsyms()

Old GCC (4.1) does not see through the code flow of parse_proc_kallsyms()
and gets confused about the status of 'fmt':

util/trace-event-parse.c: In function ‘parse_proc_kallsyms’:
util/trace-event-parse.c:189: warning: ‘fmt’ may be used uninitialized in this function
make: *** [util/trace-event-parse.o] Error 1

Help out GCC by initializing 'fmt' to NULL.



Signed-off-by: Ingo Molnar <>

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index fe7a27d..e9e1c03 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -186,7 +186,7 @@ void parse_proc_kallsyms(struct pevent *pevent,
char *next = NULL;
char *addr_str;
char *mod;
- char *fmt;
+ char *fmt = NULL;

line = strtok_r(file, "\n", &next);
while (line) {
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