selftests/bpf: Don't assume page size is 4096

The verifier test creates BPF ringbuf maps using hard-coded
4096 as max_entries. Some tests will fail if the page size
of the running kernel is not 4096. Use getpagesize() instead.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230326095341.816023-1-hengqi.chen@gmail.com

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 5b90eef09ade94dd05b94fde13691efca1bc3754..e4657c5bc3f12ee92e0c1db62aabd60c2941db37 100644 (file)
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -1079,7 +1079,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
        }
        if (*fixup_map_ringbuf) {
                map_fds[20] = create_map(BPF_MAP_TYPE_RINGBUF, 0,
-                                          0, 4096);
+                                        0, getpagesize());
                do {
                        prog[*fixup_map_ringbuf].imm = map_fds[20];
                        fixup_map_ringbuf++;