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libperf tests: Avoid uninitialized variable warning 

The variable 'bf' is read (for a write call) without being initialized
triggering a memory sanitizer warning. Use 'bf' in the read and switch
the write to reading from a string.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210114212304.4018119-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2021-01-14 13:23:04 -08:00 committed by Arnaldo Carvalho de Melo
parent a042a82ddb
commit be82fddca8
1 changed files with 2 additions and 2 deletions
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4
tools/lib/perf/tests/test-evlist.c
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@ -208,7 +208,6 @@ static int test_mmap_thread(void)
char path[PATH_MAX];
int id, err, pid, go_pipe[2];
union perf_event *event;
char bf;
int count = 0;
snprintf(path, PATH_MAX, "%s/kernel/debug/tracing/events/syscalls/sys_enter_prctl/id",
@ -229,6 +228,7 @@ static int test_mmap_thread(void)
pid = fork();
if (!pid) {
int i;
char bf;
read(go_pipe[0], &bf, 1);
@ -266,7 +266,7 @@ static int test_mmap_thread(void)
perf_evlist__enable(evlist);
/* kick the child and wait for it to finish */
write(go_pipe[1], &bf, 1);
write(go_pipe[1], "A", 1);
waitpid(pid, NULL, 0);
/*