diff mbox series

[v2,bpf-next,1/4] libbpf: skip CO-RE relocations for not loaded BPF programs

Message ID 20201007202946.3684483-2-andrii@kernel.org (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series libbpf: auto-resize relocatable LOAD/STORE instructions | expand

Commit Message

Andrii Nakryiko Oct. 7, 2020, 8:29 p.m. UTC
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 <andrii@kernel.org>
---
 tools/lib/bpf/libbpf.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index faec389c4849..07d62771472f 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/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);