| Message ID | 20230705123432.1655-1-machel@vivo.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v1] selftests:bpf:Fix repeated initialization | expand |
Thank you, but I don't understand the error. -----邮件原件----- 发件人: Daniel Borkmann <daniel@iogearbox.net> 发送时间: 2023年7月5日 21:32 收件人: 王明-软件底层技术部 <machel@vivo.com>; Alexei Starovoitov <ast@kernel.org>; Andrii Nakryiko <andrii@kernel.org>; Martin KaFai Lau <martin.lau@linux.dev>; Song Liu <song@kernel.org>; Yonghong Song <yhs@fb.com>; John Fastabend <john.fastabend@gmail.com>; KP Singh <kpsingh@kernel.org>; Stanislav Fomichev <sdf@google.com>; Hao Luo <haoluo@google.com>; Jiri Olsa <jolsa@kernel.org>; Mykola Lysenko <mykolal@fb.com>; Shuah Khan <shuah@kernel.org>; bpf@vger.kernel.org; linux-kselftest@vger.kernel.org; linux-kernel@vger.kernel.org 抄送: opensource.kernel <opensource.kernel@vivo.com> 主题: Re: [PATCH v1] selftests:bpf:Fix repeated initialization On 7/5/23 2:33 PM, Wang Ming wrote: > In use_missing_map function, value is > initialized twice.There is no > connection between the two assignment. > This patch could fix this bug. Please never submit patches where you are just speculating and did not even bother to run BPF selftests ! Otherwise you would have seen that your change is breaking it : Error: #126 log_fixup Error: #126/5 log_fixup/missing_map Error: #126/5 log_fixup/missing_map missing_map:PASS:skel_open 0 nsec libbpf: prog 'use_missing_map': BPF program load failed: Invalid argument libbpf: prog 'use_missing_map': failed to load: -22 libbpf: failed to load object 'test_log_fixup' libbpf: failed to load BPF skeleton 'test_log_fixup': -22 missing_map:PASS:load_fail 0 nsec missing_map:PASS:existing_map_autocreate 0 nsec missing_map:PASS:missing_map_autocreate 0 nsec missing_map:FAIL:log_buf unexpected log_buf: '8: <invalid BPF map reference> BPF map 'missing_map' is referenced but wasn't created ' is not a substring of 'reg type unsupported for arg#0 function use_missing_map#20 0: R1=ctx(off=0,imm=0) R10=fp0 ; int use_missing_map(const void *ctx) 0: (b4) w1 = 0 ; R1_w=0 ; int zero = 0; 1: (63) *(u32 *)(r10 -4) = r1 ; R1_w=0 R10=fp0 fp-8=0000???? 2: (bf) r2 = r10 ; R2_w=fp0 R10=fp0 ; 3: (07) r2 += -4 ; R2_w=fp-4 ; return bpf_map_lookup_elem(&missing_map, &zero) != NULL; 4: <invalid BPF map reference> BPF map 'missing_map' is referenced but wasn't created processed 5 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0 > Signed-off-by: Wang Ming <machel@vivo.com> > --- > tools/testing/selftests/bpf/progs/test_log_fixup.c | 8 ++------ > 1 file changed, 2 insertions(+), 6 deletions(-) > > diff --git a/tools/testing/selftests/bpf/progs/test_log_fixup.c > b/tools/testing/selftests/bpf/progs/test_log_fixup.c > index 1bd48feaaa42..1c49b2f9be6c 100644 > --- a/tools/testing/selftests/bpf/progs/test_log_fixup.c > +++ b/tools/testing/selftests/bpf/progs/test_log_fixup.c > @@ -52,13 +52,9 @@ struct { > SEC("?raw_tp/sys_enter") > int use_missing_map(const void *ctx) > { > - int zero = 0, *value; > + int zero = 0; > > - value = bpf_map_lookup_elem(&existing_map, &zero); > - > - value = bpf_map_lookup_elem(&missing_map, &zero); > - > - return value != NULL; > + return bpf_map_lookup_elem(&missing_map, &zero) != NULL; > } > > extern int bpf_nonexistent_kfunc(void) __ksym __weak; >
diff --git a/tools/testing/selftests/bpf/progs/test_log_fixup.c b/tools/testing/selftests/bpf/progs/test_log_fixup.c index 1bd48feaaa42..1c49b2f9be6c 100644 --- a/tools/testing/selftests/bpf/progs/test_log_fixup.c +++ b/tools/testing/selftests/bpf/progs/test_log_fixup.c @@ -52,13 +52,9 @@ struct { SEC("?raw_tp/sys_enter") int use_missing_map(const void *ctx) { - int zero = 0, *value; + int zero = 0; - value = bpf_map_lookup_elem(&existing_map, &zero); - - value = bpf_map_lookup_elem(&missing_map, &zero); - - return value != NULL; + return bpf_map_lookup_elem(&missing_map, &zero) != NULL; } extern int bpf_nonexistent_kfunc(void) __ksym __weak;
In use_missing_map function, value is initialized twice.There is no connection between the two assignment. This patch could fix this bug. Signed-off-by: Wang Ming <machel@vivo.com> --- tools/testing/selftests/bpf/progs/test_log_fixup.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)