Re: [PATCH v3] btf: warn but return no error for NULL btf from __register_btf_kfunc_id_set()

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On 7/1/23 7:14 PM, SeongJae Park wrote:
__register_btf_kfunc_id_set() assumes .BTF to be part of the module's
.ko file if CONFIG_DEBUG_INFO_BTF is enabled.  If that's not the case,
the function prints an error message and return an error.  As a result,
such modules cannot be loaded.

However, the section could be stripped out during a build process.  It
would be better to let the modules loaded, because their basic
functionalities have no problem[1], though the BTF functionalities will
not be supported.  Make the function to lower the level of the message
from error to warn, and return no error.

[1] https://lore.kernel.org/bpf/20220219082037.ow2kbq5brktf4f2u@apollo.legion/

Reported-by: Alexander Egorenkov <Alexander.Egorenkov@xxxxxxx>
Link: https://lore.kernel.org/bpf/87y228q66f.fsf@xxxxxxxxxxxxxxxxxxxx/
Suggested-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20220219082037.ow2kbq5brktf4f2u@apollo.legion/
Fixes: c446fdacb10d ("bpf: fix register_btf_kfunc_id_set for !CONFIG_DEBUG_INFO_BTF")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.18.x
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---

Changes from v2
(https://lore.kernel.org/bpf/20230628164611.83038-1-sj@xxxxxxxxxx/)
- Keep the error for vmlinux case.

Looks good, applied to bpf, thanks!




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