Merge branch 'clean-up bpftool from legacy support'

Sahid Orentino Ferdjaoui says:

====================

As part of commit 93b8952d223a ("libbpf: deprecate legacy BPF map
definitions") and commit bd054102a8c7 ("libbpf: enforce strict libbpf
1.0 behaviors") The --legacy option is not relevant anymore. #1 is
removing it. #4 is cleaning the code from using libbpf_get_error().

About patches #2 and #3 They are changes discovered while working on
this series (credits to Quentin Monnet). #2 is cleaning-up usage of an
unnecessary PTR_ERR(NULL), finally #3 is fixing an invalid value
passed to strerror().

v1 -> v2:
   - Addressed review comments from Yonghong Song on patch #4
   - Added a patch #5 that removes unwanted function noticed by
     Yonghong Song
v2 -> v3
   - Addressed review comments from Andrii Nakryiko on patch #2, #3, #4
     * clean-up usage of libbpf_get_error() (#2, #3)
     * fix possible return of an uninitialized local variable err
     * fix returned errors using errno
v3 -> v4
   - Addressed review comments from Quentin Monnet
     * fix line moved from patch #2 to patch #3
     * fix missing returned errors using errno
     * fix some returned values to errno instead of -1
====================

Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 7 insertions, 13 deletions

diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index d884070a2314..88911d3aa2d9 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -786,18 +786,18 @@ static int get_map_kv_btf(const struct bpf_map_info *info, struct btf **btf)
 	if (info->btf_vmlinux_value_type_id) {
 		if (!btf_vmlinux) {
 			btf_vmlinux = libbpf_find_kernel_btf();
-			err = libbpf_get_error(btf_vmlinux);
-			if (err) {
+			if (!btf_vmlinux) {
 				p_err("failed to get kernel btf");
-				return err;
+				return -errno;
 			}
 		}
 		*btf = btf_vmlinux;
 	} else if (info->btf_value_type_id) {
 		*btf = btf__load_from_kernel_by_id(info->btf_id);
-		err = libbpf_get_error(*btf);
-		if (err)
+		if (!*btf) {
+			err = -errno;
 			p_err("failed to get btf");
+		}
 	} else {
 		*btf = NULL;
 	}
@@ -807,16 +807,10 @@ static int get_map_kv_btf(const struct bpf_map_info *info, struct btf **btf)
 
 static void free_map_kv_btf(struct btf *btf)
 {
-	if (!libbpf_get_error(btf) && btf != btf_vmlinux)
+	if (btf != btf_vmlinux)
 		btf__free(btf);
 }
 
-static void free_btf_vmlinux(void)
-{
-	if (!libbpf_get_error(btf_vmlinux))
-		btf__free(btf_vmlinux);
-}
-
 static int
 map_dump(int fd, struct bpf_map_info *info, json_writer_t *wtr,
 	 bool show_header)
@@ -953,7 +947,7 @@ exit_close:
 		close(fds[i]);
 exit_free:
 	free(fds);
-	free_btf_vmlinux();
+	btf__free(btf_vmlinux);
 	return err;
 }