perf kmaps: Check kmaps to make code more robust
This patch add checks in places where map__kmap is used to get kmaps
from struct kmap.
Error messages are added at map__kmap to warn invalid accessing of kmap
(for the case of !map->dso->kernel, kmap(map) does not exists at all).
Also, introduces map__kmaps() to warn uninitialized kmaps.
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: pi3orama@163.com
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1428394966-131044-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 0e42438..ec19c59 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -76,10 +76,8 @@
void map_groups__put(struct map_groups *mg);
-static inline struct kmap *map__kmap(struct map *map)
-{
- return (struct kmap *)(map + 1);
-}
+struct kmap *map__kmap(struct map *map);
+struct map_groups *map__kmaps(struct map *map);
static inline u64 map__map_ip(struct map *map, u64 ip)
{