perf evlist: Use cpu_map__nr() helper

Use the cpu_map__nr() helper to protect a possible NULL cpu map
dereference.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1362987798-24969-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a199f1887bef..a482547495b6 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -228,7 +228,7 @@ void perf_evlist__disable(struct perf_evlist *evlist)
         int cpu, thread;
         struct perf_evsel *pos;
 
-        for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
+        for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
                 list_for_each_entry(pos, &evlist->entries, node) {
                         if (!perf_evsel__is_group_leader(pos))
                                 continue;
@@ -443,7 +443,7 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
         struct perf_evsel *evsel;
         int cpu, thread;
 
-        for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
+        for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
                 int output = -1;
 
                 for (thread = 0; thread < evlist->threads->nr; thread++) {
@@ -470,7 +470,7 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
         return 0;
 
 out_unmap:
-        for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
+        for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
                 if (evlist->mmap[cpu].base != NULL) {
                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
                         evlist->mmap[cpu].base = NULL;
@@ -725,7 +725,7 @@ int perf_evlist__open(struct perf_evlist *evlist)
 
         return 0;
 out_err:
-        ncpus = evlist->cpus ? evlist->cpus->nr : 1;
+        ncpus = cpu_map__nr(evlist->cpus);
         nthreads = evlist->threads ? evlist->threads->nr : 1;
 
         list_for_each_entry_reverse(evsel, &evlist->entries, node)