libbpf: deprecate bpf_object__open_buffer() API

Deprecate bpf_object__open_buffer() API in favor of
bpf_object__open_mem() instead.

Signed-off-by: Christy Lee <christylee@fb.com>

Author: christycylee

tools/lib/bpf/libbpf.h

@@ -181,6 +181,7 @@ bpf_object__open_mem(const void *obj_buf, size_t obj_buf_sz,
 		     const struct bpf_object_open_opts *opts);
 
 /* deprecated bpf_object__open variants */
+LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_object__open_mem() instead")
 LIBBPF_API struct bpf_object *
 bpf_object__open_buffer(const void *obj_buf, size_t obj_buf_sz,
 			const char *name);

tools/perf/tests/llvm.c

@@ -13,7 +13,7 @@ static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
 {
 	struct bpf_object *obj;
 
-	obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
+	obj = bpf_object__open_mem(obj_buf, obj_buf_sz, NULL);
 	if (libbpf_get_error(obj))
 		return TEST_FAIL;
 	bpf_object__close(obj);

tools/perf/util/bpf-loader.c

@@ -72,6 +72,9 @@ bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
 
 struct bpf_object *bpf__prepare_load(const char *filename, bool source)
 {
+	DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
+		.object_name = filename
+	);
 	struct bpf_object *obj;
 
 	if (!libbpf_initialized) {
@@ -94,7 +97,7 @@ struct bpf_object *bpf__prepare_load(const char *filename, bool source)
 				return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
 		} else
 			pr_debug("bpf: successful builtin compilation\n");
-		obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
+		obj = bpf_object__open_mem(obj_buf, obj_buf_sz, &opts);
 
 		if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
 			llvm__dump_obj(filename, obj_buf, obj_buf_sz);