[PATCH bpf-next] tools/bpf: silence a libbpf unnecessary warning

[PATCH bpf-next] tools/bpf: silence a libbpf unnecessary warning

[Yonghong Song]

Commit 96408c43447a ("tools/bpf: implement libbpf
btf__get_map_kv_tids() API function") refactored
function bpf_map_find_btf_info() and moved bulk of
implementation into btf.c as btf__get_map_kv_tids().
This change introduced a bug such that test_btf will
print out the following warning although the test passed:
  BTF libbpf test[2] (test_btf_nokv.o): libbpf: map:btf_map
      container_name:____btf_map_btf_map cannot be found
      in BTF. Missing BPF_ANNOTATE_KV_PAIR?

Previously, the error message is guarded with pr_debug().
Commit 96408c43447a changed it to pr_warning() and
hence caused the warning.

Restoring to pr_debug() for the message fixed the issue.

Fixes: 96408c43447a ("tools/bpf: implement libbpf btf__get_map_kv_tids() API function")
Signed-off-by: Yonghong Song <yhs@fb.com>
---
 tools/lib/bpf/btf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 3b3a2959d03a..ab6528c935a1 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -531,8 +531,8 @@ int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
 
 	container_id = btf__find_by_name(btf, container_name);
 	if (container_id < 0) {
-		pr_warning("map:%s container_name:%s cannot be found in BTF. Missing BPF_ANNOTATE_KV_PAIR?\n",
-			   map_name, container_name);
+		pr_debug("map:%s container_name:%s cannot be found in BTF. Missing BPF_ANNOTATE_KV_PAIR?\n",
+			 map_name, container_name);
 		return container_id;
 	}
 
-- 
2.17.1

Re: [PATCH bpf-next] tools/bpf: silence a libbpf unnecessary warning

[Alexei Starovoitov]

On Tue, Feb 05, 2019 at 09:38:30PM -0800, Yonghong Song wrote:
> Commit 96408c43447a ("tools/bpf: implement libbpf
> btf__get_map_kv_tids() API function") refactored
> function bpf_map_find_btf_info() and moved bulk of
> implementation into btf.c as btf__get_map_kv_tids().
> This change introduced a bug such that test_btf will
> print out the following warning although the test passed:
>   BTF libbpf test[2] (test_btf_nokv.o): libbpf: map:btf_map
>       container_name:____btf_map_btf_map cannot be found
>       in BTF. Missing BPF_ANNOTATE_KV_PAIR?
> 
> Previously, the error message is guarded with pr_debug().
> Commit 96408c43447a changed it to pr_warning() and
> hence caused the warning.
> 
> Restoring to pr_debug() for the message fixed the issue.
> 
> Fixes: 96408c43447a ("tools/bpf: implement libbpf btf__get_map_kv_tids() API function")
> Signed-off-by: Yonghong Song <yhs@fb.com>

Applied. It fixed the issue I was seeing. Thanks!