libbpf: Add missed btf_ext__raw_data() API

Another API that was declared in libbpf.map but actual implementation
was missing. btf_ext__get_raw_data() was intended as a discouraged alias
to consistently-named btf_ext__raw_data(), so make this an actuality.

Fixes: 20eccf29 ("libbpf: hide and discourage inconsistently named getters")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20240201172027.604869-5-andrii@kernel.org

tools/lib/bpf/btf.c

@@ -3050,12 +3050,16 @@ struct btf_ext *btf_ext__new(const __u8 *data, __u32 size)
 	return btf_ext;
 }
 
-const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext, __u32 *size)
+const void *btf_ext__raw_data(const struct btf_ext *btf_ext, __u32 *size)
 {
 	*size = btf_ext->data_size;
 	return btf_ext->data;
 }
 
+__attribute__((alias("btf_ext__raw_data")))
+const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext, __u32 *size);
+
+
 struct btf_dedup;
 
 static struct btf_dedup *btf_dedup_new(struct btf *btf, const struct btf_dedup_opts *opts);

tools/lib/bpf/libbpf.map

@@ -325,7 +325,6 @@ LIBBPF_0.7.0 {
 		bpf_xdp_detach;
 		bpf_xdp_query;
 		bpf_xdp_query_id;
-		btf_ext__raw_data;
 		libbpf_probe_bpf_helper;
 		libbpf_probe_bpf_map_type;
 		libbpf_probe_bpf_prog_type;
@@ -413,4 +412,5 @@ LIBBPF_1.4.0 {
 	global:
 		bpf_token_create;
 		btf__new_split;
+		btf_ext__raw_data;
 } LIBBPF_1.3.0;

tools/lib/bpf/linker.c

@@ -2732,7 +2732,7 @@ static int finalize_btf(struct bpf_linker *linker)
 
 	/* Emit .BTF.ext section */
 	if (linker->btf_ext) {
-		raw_data = btf_ext__get_raw_data(linker->btf_ext, &raw_sz);
+		raw_data = btf_ext__raw_data(linker->btf_ext, &raw_sz);
 		if (!raw_data)
 			return -ENOMEM;