diff options
| author | Hou Tao <houtao1@huawei.com> | 2021-10-04 17:48:57 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-10-08 13:22:57 -0700 |
| commit | fa7f17d066bd0996b930b664aa0ed1f213fc1828 (patch) | |
| tree | e2abd0f4d04594fc4204db299cb5b74be0d222f8 /tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | |
| parent | libbpf: Support detecting and attaching of writable tracepoint program (diff) | |
| download | linux-fa7f17d066bd0996b930b664aa0ed1f213fc1828.tar.gz linux-fa7f17d066bd0996b930b664aa0ed1f213fc1828.zip | |
bpf/selftests: Add test for writable bare tracepoint
Add a writable bare tracepoint in bpf_testmod module, and
trigger its calling when reading /sys/kernel/bpf_testmod
with a specific buffer length. The reading will return
the value in writable context if the early return flag
is enabled in writable context.
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211004094857.30868-4-hotforest@gmail.com
Diffstat (limited to 'tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c')
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c index b892948dc134..5d52ea2768df 100644 --- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c +++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c @@ -50,6 +50,16 @@ bpf_testmod_test_read(struct file *file, struct kobject *kobj, if (bpf_testmod_loop_test(101) > 100) trace_bpf_testmod_test_read(current, &ctx); + /* Magic number to enable writable tp */ + if (len == 64) { + struct bpf_testmod_test_writable_ctx writable = { + .val = 1024, + }; + trace_bpf_testmod_test_writable_bare(&writable); + if (writable.early_ret) + return snprintf(buf, len, "%d\n", writable.val); + } + return -EIO; /* always fail */ } EXPORT_SYMBOL(bpf_testmod_test_read); |