linux-kernel - [PATCH] bpftool: mmaped fields missing map structure in generated skeletons

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Message-ID: <20220523202649.6iiz4h2wf5ryx3w2@jup>
Date:   Mon, 23 May 2022 16:26:49 -0400
From:   Michael Mullin <masmullin@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] bpftool: mmaped fields missing map structure in generated
 skeletons

When generating a skeleton which has an mmaped map field, bpftool's
output is missing the map structure.  This causes a compile break when
the generated skeleton is compiled as the field belongs to the internal
struct maps, not directly to the obj.

Signed-off-by: Michael Mullin <masmullin@...il.com>
---
 tools/bpf/bpftool/gen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index f158dc1c2149..b49293795ba0 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -853,7 +853,7 @@ codegen_maps_skeleton(struct bpf_object *obj, size_t map_cnt, bool mmaped)
 			i, bpf_map__name(map), i, ident);
 		/* memory-mapped internal maps */
 		if (mmaped && is_internal_mmapable_map(map, ident, sizeof(ident))) {
-			printf("\ts->maps[%zu].mmaped = (void **)&obj->%s;\n",
+			printf("\ts->maps[%zu].mmaped = (void **)&obj->maps.%s;\n",
 				i, ident);
 		}
 		i++;
-- 
2.36.1