diff options
| author | Martin KaFai Lau <kafai@fb.com> | 2021-11-05 18:40:20 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-11-06 12:54:12 -0700 |
| commit | d99341b373215cf32bfb7f341fb3e720e0e791ef (patch) | |
| tree | 54810b9f3412a1609a829507bf943ae58e88b243 /tools/testing/selftests/bpf/progs | |
| parent | 3990ed4c426652fcd469f8c9dc08156294b36c28 (diff) | |
bpf: selftest: Trigger a DCE on the whole subprog
This patch adds a test to trigger the DCE to remove
the whole subprog to ensure the verifier does not
depend on a stable subprog index. The DCE is done
by testing a global const.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211106014020.651638-1-kafai@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf/progs')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/for_each_array_map_elem.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/for_each_array_map_elem.c b/tools/testing/selftests/bpf/progs/for_each_array_map_elem.c index df918b2469da..52f6995ff29c 100644 --- a/tools/testing/selftests/bpf/progs/for_each_array_map_elem.c +++ b/tools/testing/selftests/bpf/progs/for_each_array_map_elem.c @@ -23,6 +23,16 @@ struct callback_ctx { int output; }; +const volatile int bypass_unused = 1; + +static __u64 +unused_subprog(struct bpf_map *map, __u32 *key, __u64 *val, + struct callback_ctx *data) +{ + data->output = 0; + return 1; +} + static __u64 check_array_elem(struct bpf_map *map, __u32 *key, __u64 *val, struct callback_ctx *data) @@ -54,6 +64,8 @@ int test_pkt_access(struct __sk_buff *skb) data.output = 0; bpf_for_each_map_elem(&arraymap, check_array_elem, &data, 0); + if (!bypass_unused) + bpf_for_each_map_elem(&arraymap, unused_subprog, &data, 0); arraymap_output = data.output; bpf_for_each_map_elem(&percpu_map, check_percpu_elem, (void *)0, 0); |