diff options
| author | Andrii Nakryiko <andriin@fb.com> | 2019-11-06 23:15:00 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-11-07 00:54:59 +0300 |
| commit | ed578021210e14f15a654c825fba6a700c9a39a7 (patch) | |
| tree | 0c47815ef3f5ba07f5e0e1262b9a6127fed70bca /tools/testing/selftests/bpf | |
| parent | 65a052d537f40e992eb1629cc6c25874064f51fd (diff) | |
| download | linux-ed578021210e14f15a654c825fba6a700c9a39a7.tar.xz | |
libbpf: Simplify BPF_CORE_READ_BITFIELD_PROBED usage
Streamline BPF_CORE_READ_BITFIELD_PROBED interface to follow
BPF_CORE_READ_BITFIELD (direct) and BPF_CORE_READ, in general, i.e., just
return read result or 0, if underlying bpf_probe_read() failed.
In practice, real applications rarely check bpf_probe_read() result, because
it has to always work or otherwise it's a bug. So propagating internal
bpf_probe_read() error from this macro hurts usability without providing real
benefits in practice. This patch fixes the issue and simplifies usage,
noticeable even in selftest itself.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20191106201500.2582438-1-andriin@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_probed.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_probed.c b/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_probed.c index a381f8ac2419..e466e3ab7de4 100644 --- a/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_probed.c +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_probed.c @@ -37,11 +37,6 @@ struct core_reloc_bitfields_output { int64_t s32; }; -#define TRANSFER_BITFIELD(in, out, field) \ - if (BPF_CORE_READ_BITFIELD_PROBED(in, field, &res)) \ - return 1; \ - out->field = res - SEC("raw_tracepoint/sys_enter") int test_core_bitfields(void *ctx) { @@ -49,13 +44,13 @@ int test_core_bitfields(void *ctx) struct core_reloc_bitfields_output *out = (void *)&data.out; uint64_t res; - TRANSFER_BITFIELD(in, out, ub1); - TRANSFER_BITFIELD(in, out, ub2); - TRANSFER_BITFIELD(in, out, ub7); - TRANSFER_BITFIELD(in, out, sb4); - TRANSFER_BITFIELD(in, out, sb20); - TRANSFER_BITFIELD(in, out, u32); - TRANSFER_BITFIELD(in, out, s32); + out->ub1 = BPF_CORE_READ_BITFIELD_PROBED(in, ub1); + out->ub2 = BPF_CORE_READ_BITFIELD_PROBED(in, ub2); + out->ub7 = BPF_CORE_READ_BITFIELD_PROBED(in, ub7); + out->sb4 = BPF_CORE_READ_BITFIELD_PROBED(in, sb4); + out->sb20 = BPF_CORE_READ_BITFIELD_PROBED(in, sb20); + out->u32 = BPF_CORE_READ_BITFIELD_PROBED(in, u32); + out->s32 = BPF_CORE_READ_BITFIELD_PROBED(in, s32); return 0; } |