bpftool: Support dumping BTF VAR's "extern" linkage

Add dumping of "extern" linkage for BTF VAR kind. Also shorten
"global-allocated" to "global" to be in line with FUNC's "global".

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210423181348.1801389-2-andrii@kernel.org

diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index 62953bb..001749a 100644 (file)
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -71,7 +71,9 @@ static const char *btf_var_linkage_str(__u32 linkage)
        case BTF_VAR_STATIC:
                return "static";
        case BTF_VAR_GLOBAL_ALLOCATED:
-               return "global-alloc";
+               return "global";
+       case BTF_VAR_GLOBAL_EXTERN:
+               return "extern";
        default:
                return "(unknown)";
        }