From: Shunsuke Nakamura nakamura.shun@fujitsu.com
[ Upstream commit 3ff6d64e68abc231955d216236615918797614ae ]
The `cpu` argument of perf_evsel__read() must specify the cpu index.
perf_cpu_map__for_each_cpu() is for iterating the cpu number (not index) and is thus not appropriate for use with perf_evsel__read().
So, if there is an offline CPU, the cpu number specified in the argument may point out of range because the cpu number and the cpu index are different.
Fix test_stat_cpu().
Testing it:
# make tests -C tools/lib/perf/ make: Entering directory '/home/nakamura/kernel_src/linux-5.15-rc4_fix/tools/lib/perf' running static: - running tests/test-cpumap.c...OK - running tests/test-threadmap.c...OK - running tests/test-evlist.c...OK - running tests/test-evsel.c...OK running dynamic: - running tests/test-cpumap.c...OK - running tests/test-threadmap.c...OK - running tests/test-evlist.c...OK - running tests/test-evsel.c...OK make: Leaving directory '/home/nakamura/kernel_src/linux-5.15-rc4_fix/tools/lib/perf'
Signed-off-by: Shunsuke Nakamura nakamura.shun@fujitsu.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: Mark Rutland mark.rutland@arm.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Link: http://lore.kernel.org/lkml/20211011083704.4108720-1-nakamura.shun@fujitsu.c... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/lib/perf/tests/test-evlist.c | 6 +++--- tools/lib/perf/tests/test-evsel.c | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/tools/lib/perf/tests/test-evlist.c b/tools/lib/perf/tests/test-evlist.c index bd19cabddaf6..60b5d1801103 100644 --- a/tools/lib/perf/tests/test-evlist.c +++ b/tools/lib/perf/tests/test-evlist.c @@ -38,7 +38,7 @@ static int test_stat_cpu(void) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK, }; - int err, cpu, tmp; + int err, idx;
cpus = perf_cpu_map__new(NULL); __T("failed to create cpus", cpus); @@ -64,10 +64,10 @@ static int test_stat_cpu(void) perf_evlist__for_each_evsel(evlist, evsel) { cpus = perf_evsel__cpus(evsel);
- perf_cpu_map__for_each_cpu(cpu, tmp, cpus) { + for (idx = 0; idx < perf_cpu_map__nr(cpus); idx++) { struct perf_counts_values counts = { .val = 0 };
- perf_evsel__read(evsel, cpu, 0, &counts); + perf_evsel__read(evsel, idx, 0, &counts); __T("failed to read value for evsel", counts.val != 0); } } diff --git a/tools/lib/perf/tests/test-evsel.c b/tools/lib/perf/tests/test-evsel.c index 0ad82d7a2a51..2de98768d844 100644 --- a/tools/lib/perf/tests/test-evsel.c +++ b/tools/lib/perf/tests/test-evsel.c @@ -21,7 +21,7 @@ static int test_stat_cpu(void) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_CLOCK, }; - int err, cpu, tmp; + int err, idx;
cpus = perf_cpu_map__new(NULL); __T("failed to create cpus", cpus); @@ -32,10 +32,10 @@ static int test_stat_cpu(void) err = perf_evsel__open(evsel, cpus, NULL); __T("failed to open evsel", err == 0);
- perf_cpu_map__for_each_cpu(cpu, tmp, cpus) { + for (idx = 0; idx < perf_cpu_map__nr(cpus); idx++) { struct perf_counts_values counts = { .val = 0 };
- perf_evsel__read(evsel, cpu, 0, &counts); + perf_evsel__read(evsel, idx, 0, &counts); __T("failed to read value for evsel", counts.val != 0); }