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perf mem-events: Avoid uninitialized read

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pmu should be initialized to NULL before perf_pmus__scan loop. Fix and
shrink the scope of pmu at the same time. Issue detected by clang-tidy.

Fixes: 5752c20f37 ("perf mem: Scan all PMUs instead of just core ones")
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: llvm@lists.linux.dev
Cc: Ming Wang <wangming01@loongson.cn>
Cc: Tom Rix <trix@redhat.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20231009183920.200859-10-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers 2023-10-09 11:39:10 -07:00 committed by Namhyung Kim
parent b3aa09ee78
commit 85f73c377b
1 changed files with 2 additions and 1 deletions
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3
tools/perf/util/mem-events.c
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@ -185,7 +185,6 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
{ {
int i = *argv_nr, k = 0; int i = *argv_nr, k = 0;
struct perf_mem_event *e; struct perf_mem_event *e;
struct perf_pmu *pmu;
for (int j = 0; j < PERF_MEM_EVENTS__MAX; j++) { for (int j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
e = perf_mem_events__ptr(j); e = perf_mem_events__ptr(j);
@ -202,6 +201,8 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
rec_argv[i++] = "-e"; rec_argv[i++] = "-e";
rec_argv[i++] = perf_mem_events__name(j, NULL); rec_argv[i++] = perf_mem_events__name(j, NULL);
} else { } else {
struct perf_pmu *pmu = NULL;
if (!e->supported) { if (!e->supported) {
perf_mem_events__print_unsupport_hybrid(e, j); perf_mem_events__print_unsupport_hybrid(e, j);
return -1; return -1;