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perf map: Convert map_groups.refcnt from atomic_t to refcount_t
The refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Kook <keescook@chromium.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Windsor <dwindsor@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Hans Liljestrand <ishkamiel@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kees Kook <keescook@chromium.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: alsa-devel@alsa-project.org Link: http://lkml.kernel.org/r/1487691303-31858-7-git-send-email-elena.reshetova@intel.com [ Did the missing conversion of tests/thread-mg-share.c too ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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3 changed files with 10 additions and 10 deletions
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@ -43,7 +43,7 @@ int test__thread_mg_share(int subtest __maybe_unused)
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leader && t1 && t2 && t3 && other);
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mg = leader->mg;
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TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 4);
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TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 4);
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/* test the map groups pointer is shared */
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TEST_ASSERT_VAL("map groups don't match", mg == t1->mg);
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@ -71,25 +71,25 @@ int test__thread_mg_share(int subtest __maybe_unused)
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machine__remove_thread(machine, other_leader);
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other_mg = other->mg;
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TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 2);
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TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_mg->refcnt), 2);
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TEST_ASSERT_VAL("map groups don't match", other_mg == other_leader->mg);
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/* release thread group */
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thread__put(leader);
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TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 3);
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TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 3);
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thread__put(t1);
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TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 2);
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TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 2);
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thread__put(t2);
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TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 1);
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TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 1);
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thread__put(t3);
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/* release other group */
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thread__put(other_leader);
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TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 1);
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TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_mg->refcnt), 1);
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thread__put(other);
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@ -485,7 +485,7 @@ void map_groups__init(struct map_groups *mg, struct machine *machine)
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maps__init(&mg->maps[i]);
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}
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mg->machine = machine;
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atomic_set(&mg->refcnt, 1);
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refcount_set(&mg->refcnt, 1);
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}
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static void __maps__purge(struct maps *maps)
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@ -547,7 +547,7 @@ void map_groups__delete(struct map_groups *mg)
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void map_groups__put(struct map_groups *mg)
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{
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if (mg && atomic_dec_and_test(&mg->refcnt))
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if (mg && refcount_dec_and_test(&mg->refcnt))
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map_groups__delete(mg);
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}
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@ -67,7 +67,7 @@ struct maps {
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struct map_groups {
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struct maps maps[MAP__NR_TYPES];
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struct machine *machine;
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atomic_t refcnt;
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refcount_t refcnt;
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};
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struct map_groups *map_groups__new(struct machine *machine);
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@ -77,7 +77,7 @@ bool map_groups__empty(struct map_groups *mg);
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static inline struct map_groups *map_groups__get(struct map_groups *mg)
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{
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if (mg)
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atomic_inc(&mg->refcnt);
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refcount_inc(&mg->refcnt);
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return mg;
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}
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