selftests/bpf: Mute expected invalid map creation error msg

Previously, the newly introduced test case in test_map_in_map(), which
checks whether the inner map is destroyed after unsuccessful creation of
the outer map, logged the following harmless and expected error:

    libbpf: map 'mim': failed to create: Invalid argument(-22) libbpf:
    failed to load object './test_map_in_map_invalid.o'

To avoid any possible confusion, mute the logging during loading of the
prog.

Fixes: 08f71a1e39a1 ("selftests/bpf: Check inner map deletion")
Reported-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Martynas Pumputis <m@lambda.lt>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210721140941.563175-1-m@lambda.lt

diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index 5a8e069..14cea86 100644 (file)
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -1163,6 +1163,7 @@ static void test_map_in_map(void)
        struct bpf_map_info info = {};
        __u32 len = sizeof(info);
        __u32 id = 0;
+       libbpf_print_fn_t old_print_fn;
 
        obj = bpf_object__open(MAPINMAP_PROG);
 
@@ -1250,12 +1251,16 @@ static void test_map_in_map(void)
                goto out_map_in_map;
        }
 
+       old_print_fn = libbpf_set_print(NULL);
+
        err = bpf_object__load(obj);
        if (!err) {
                printf("Loading obj supposed to fail\n");
                goto out_map_in_map;
        }
 
+       libbpf_set_print(old_print_fn);
+
        /* Iterate over all maps to check whether the internal map
         * ("mim.internal") has been destroyed.
         */