Commit cf3ee1ec authored by Eduard Zingerman's avatar Eduard Zingerman Committed by Alexei Starovoitov
Browse files

bpf: save subprogram name in bpf_subprog_info 



Subprogram name can be computed from function info and BTF, but it is
convenient to have the name readily available for logging purposes.
Update comment saying that bpf_subprog_info->start has to be the first
field, this is no longer true, relevant sites access .start field
by it's name.

Signed-off-by: default avatarEduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260410-patch-set-v4-2-5d4eecb343db@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 33dfc521

include/linux/bpf_verifier.h

+1 −1
Original line number Diff line number Diff line
@@ -664,7 +664,7 @@ enum priv_stack_mode { 
};



struct bpf_subprog_info {

	/* 'start' has to be the first field otherwise find_subprog() won't work */

	const char *name; /* name extracted from BTF */

	u32 start; /* insn idx of function entry point */

	u32 linfo_idx; /* The idx to the main_prog->aux->linfo */

	u32 postorder_start; /* The idx to the env->cfg.insn_postorder */

kernel/bpf/verifier.c

+1 −0
Original line number Diff line number Diff line
@@ -19797,6 +19797,7 @@ static int check_btf_func(struct bpf_verifier_env *env, 
			goto err_free;

		}









		env->subprog_info[i].name = btf_name_by_offset(btf, type->name_off);









		bpfptr_add(&urecord, urec_size);









	}