diff options
| author | Xu Kuohai <xukuohai@huawei.com> | 2022-03-01 00:32:49 -0500 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-03-01 13:40:57 +0100 |
| commit | 4226961b0019b2e1612029e8950a9e911affc995 (patch) | |
| tree | bdf11caa97727b699939eb0d573facfd0dad7af3 /tools/lib | |
| parent | b664e255ba3c655a675e4e1fe9503d6f7ada3305 (diff) | |
libbpf: Skip forward declaration when counting duplicated type names
Currently if a declaration appears in the BTF before the definition, the
definition is dumped as a conflicting name, e.g.:
$ bpftool btf dump file vmlinux format raw | grep "'unix_sock'"
[81287] FWD 'unix_sock' fwd_kind=struct
[89336] STRUCT 'unix_sock' size=1024 vlen=14
$ bpftool btf dump file vmlinux format c | grep "struct unix_sock"
struct unix_sock;
struct unix_sock___2 { <--- conflict, the "___2" is unexpected
struct unix_sock___2 *unix_sk;
This causes a compilation error if the dump output is used as a header file.
Fix it by skipping declaration when counting duplicated type names.
Fixes: 351131b51c7a ("libbpf: add btf_dump API for BTF-to-C conversion")
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220301053250.1464204-2-xukuohai@huawei.com
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/btf_dump.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index 07ebe70d3a30..6b1bc1f43728 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -1505,6 +1505,11 @@ static const char *btf_dump_resolve_name(struct btf_dump *d, __u32 id, if (s->name_resolved) return *cached_name ? *cached_name : orig_name; + if (btf_is_fwd(t) || (btf_is_enum(t) && btf_vlen(t) == 0)) { + s->name_resolved = 1; + return orig_name; + } + dup_cnt = btf_dump_name_dups(d, name_map, orig_name); if (dup_cnt > 1) { const size_t max_len = 256; |