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-rw-r--r--tools/lib/bpf/libbpf.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index deea27aadcef..6b4955d170ff 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2504,22 +2504,31 @@ static inline bool libbpf_prog_needs_vmlinux_btf(struct bpf_program *prog)
static int bpf_object__load_vmlinux_btf(struct bpf_object *obj)
{
+ bool need_vmlinux_btf = false;
struct bpf_program *prog;
int err;
+ /* CO-RE relocations need kernel BTF */
+ if (obj->btf_ext && obj->btf_ext->field_reloc_info.len)
+ need_vmlinux_btf = true;
+
bpf_object__for_each_program(prog, obj) {
if (libbpf_prog_needs_vmlinux_btf(prog)) {
- obj->btf_vmlinux = libbpf_find_kernel_btf();
- if (IS_ERR(obj->btf_vmlinux)) {
- err = PTR_ERR(obj->btf_vmlinux);
- pr_warn("Error loading vmlinux BTF: %d\n", err);
- obj->btf_vmlinux = NULL;
- return err;
- }
- return 0;
+ need_vmlinux_btf = true;
+ break;
}
}
+ if (!need_vmlinux_btf)
+ return 0;
+
+ obj->btf_vmlinux = libbpf_find_kernel_btf();
+ if (IS_ERR(obj->btf_vmlinux)) {
+ err = PTR_ERR(obj->btf_vmlinux);
+ pr_warn("Error loading vmlinux BTF: %d\n", err);
+ obj->btf_vmlinux = NULL;
+ return err;
+ }
return 0;
}
@@ -4945,8 +4954,8 @@ bpf_core_reloc_fields(struct bpf_object *obj, const char *targ_btf_path)
if (targ_btf_path)
targ_btf = btf__parse_elf(targ_btf_path, NULL);
else
- targ_btf = libbpf_find_kernel_btf();
- if (IS_ERR(targ_btf)) {
+ targ_btf = obj->btf_vmlinux;
+ if (IS_ERR_OR_NULL(targ_btf)) {
pr_warn("failed to get target BTF: %ld\n", PTR_ERR(targ_btf));
return PTR_ERR(targ_btf);
}
@@ -4987,7 +4996,9 @@ bpf_core_reloc_fields(struct bpf_object *obj, const char *targ_btf_path)
}
out:
- btf__free(targ_btf);
+ /* obj->btf_vmlinux is freed at the end of object load phase */
+ if (targ_btf != obj->btf_vmlinux)
+ btf__free(targ_btf);
if (!IS_ERR_OR_NULL(cand_cache)) {
hashmap__for_each_entry(cand_cache, entry, i) {
bpf_core_free_cands(entry->value);