From 44d5bc1709956f867a904985dbae173d0f498579 Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Wed, 7 Oct 2020 17:10:21 -0700 Subject: [PATCH] libbpf: Skip CO-RE relocations for not loaded BPF programs Bypass CO-RE relocations step for BPF programs that are not going to be loaded. This allows to have BPF programs compiled in and disabled dynamically if kernel is not supposed to provide enough relocation information. In such case, there won't be unnecessary warnings about failed relocations. Fixes: d929758101fc ("libbpf: Support disabling auto-loading BPF programs") Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20201008001025.292064-2-andrii@kernel.org --- src/libbpf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/libbpf.c b/src/libbpf.c index 6ede1ce..9714472 100644 --- a/src/libbpf.c +++ b/src/libbpf.c @@ -5765,6 +5765,11 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path) err = -EINVAL; goto out; } + /* no need to apply CO-RE relocation if the program is + * not going to be loaded + */ + if (!prog->load) + continue; err = bpf_core_apply_relo(prog, rec, i, obj->btf, targ_btf, cand_cache);