[v3 PATCH bpf-next 6/6] selftests/bpf: check that ->elem_count is non-zero for the hash map

[Anton Protopopov <aspsk@xxxxxxxxxxxxx>]

Previous commits populated the ->elem_count per-cpu pointer for hash maps.
Check that this pointer is non-NULL in an existing map.

Signed-off-by: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
---
 tools/testing/selftests/bpf/progs/map_ptr_kern.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/map_ptr_kern.c b/tools/testing/selftests/bpf/progs/map_ptr_kern.c
index db388f593d0a..d6e234a37ccb 100644
--- a/tools/testing/selftests/bpf/progs/map_ptr_kern.c
+++ b/tools/testing/selftests/bpf/progs/map_ptr_kern.c
@@ -33,6 +33,7 @@ struct bpf_map {
 	__u32 value_size;
 	__u32 max_entries;
 	__u32 id;
+	__s64 *elem_count;
 } __attribute__((preserve_access_index));
 
 static inline int check_bpf_map_fields(struct bpf_map *map, __u32 key_size,
@@ -111,6 +112,8 @@ static inline int check_hash(void)
 
 	VERIFY(check_default_noinline(&hash->map, map));
 
+	VERIFY(map->elem_count != NULL);
+
 	VERIFY(hash->n_buckets == MAX_ENTRIES);
 	VERIFY(hash->elem_size == 64);
 
-- 
2.34.1