[PATCH v4 bpf-next 06/14] bpf: Use BTF_ID to resolve bpf_ctx_convert struct

[Jiri Olsa]

This way the ID is resolved during compile time,
and we can remove the runtime name search.

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 kernel/bpf/btf.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 4da6b0770ff9..701a2cb5dfb2 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -18,6 +18,7 @@
 #include <linux/sort.h>
 #include <linux/bpf_verifier.h>
 #include <linux/btf.h>
+#include <linux/btf_ids.h>
 #include <linux/skmsg.h>
 #include <linux/perf_event.h>
 #include <net/sock.h>
@@ -3621,6 +3622,9 @@ static int btf_translate_to_vmlinux(struct 
bpf_verifier_log *log,
        return kern_ctx_type->type;
 }
 
+BTF_ID_LIST(bpf_ctx_convert_btf_id)
+BTF_ID(struct, bpf_ctx_convert)
+
 struct btf *btf_parse_vmlinux(void)
 {
        struct btf_verifier_env *env = NULL;
@@ -3659,10 +3663,10 @@ struct btf *btf_parse_vmlinux(void)
        if (err)
                goto errout;
 
-       /* find struct bpf_ctx_convert for type checking later */
-       btf_id = btf_find_by_name_kind(btf, "bpf_ctx_convert", BTF_KIND_STRUCT);
-       if (btf_id < 0) {
-               err = btf_id;
+       /* struct bpf_ctx_convert for type checking later */
+       btf_id = bpf_ctx_convert_btf_id[0];
+       if (btf_id <= 0) {
+               err = -EINVAL;
                goto errout;
        }
        /* btf_parse_vmlinux() runs under bpf_verifier_lock */
-- 
2.25.4