From: Yonghong Song Date: Thu, 24 Aug 2023 06:34:17 +0000 (-0700) Subject: bpf: Remove a WARN_ON_ONCE warning related to local kptr X-Git-Tag: v6.6.17~3946^2~4^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=393dc4bd92de3711012d791a93072c8cc94c4c57;p=platform%2Fkernel%2Flinux-rpi.git bpf: Remove a WARN_ON_ONCE warning related to local kptr Currently, in function bpf_obj_free_fields(), for local kptr, a warning will be issued if the struct does not contain any special fields. But actually the kernel seems totally okay with a local kptr without any special fields. Permitting no special fields also aligns with future percpu kptr which also allows no special fields. Acked-by: Dave Marchevsky Signed-off-by: Yonghong Song Link: https://lore.kernel.org/r/20230824063417.201925-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov --- diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 10666d1..ebeb069 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -657,7 +657,6 @@ void bpf_obj_free_fields(const struct btf_record *rec, void *obj) if (!btf_is_kernel(field->kptr.btf)) { pointee_struct_meta = btf_find_struct_meta(field->kptr.btf, field->kptr.btf_id); - WARN_ON_ONCE(!pointee_struct_meta); migrate_disable(); __bpf_obj_drop_impl(xchgd_field, pointee_struct_meta ? pointee_struct_meta->record :