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perf kmaps: Check kmaps to make code more robust

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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>
This commit is contained in:
Wang Nan
2015-04-07 08:22:45 +00:00
committed by Arnaldo Carvalho de Melo
parent 8ea92ceb74
commit ba92732e98
7 changed files with 70 additions and 16 deletions
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20
tools/perf/util/map.c
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@@ -778,3 +778,23 @@ struct map *maps__next(struct map *map)
return rb_entry(next, struct map, rb_node);
return NULL;
}
struct kmap *map__kmap(struct map *map)
{
if (!map->dso || !map->dso->kernel) {
pr_err("Internal error: map__kmap with a non-kernel map\n");
return NULL;
}
return (struct kmap *)(map + 1);
}
struct map_groups *map__kmaps(struct map *map)
{
struct kmap *kmap = map__kmap(map);
if (!kmap || !kmap->kmaps) {
pr_err("Internal error: map__kmaps with a non-kernel map\n");
return NULL;
}
return kmap->kmaps;
}