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libbpf: BTF is required when externs are present
author
Andrii Nakryiko
<andriin@fb.com>
Thu, 19 Dec 2019 00:28:36 +0000
(16:28 -0800)
committer
Alexei Starovoitov
<ast@kernel.org>
Thu, 19 Dec 2019 01:33:36 +0000
(17:33 -0800)
BTF is required to get type information about extern variables.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link:
https://lore.kernel.org/bpf/20191219002837.3074619-4-andriin@fb.com
tools/lib/bpf/libbpf.c
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diff --git
a/tools/lib/bpf/libbpf.c
b/tools/lib/bpf/libbpf.c
index
7b74382
..
6340b81
100644
(file)
--- a/
tools/lib/bpf/libbpf.c
+++ b/
tools/lib/bpf/libbpf.c
@@
-1887,7
+1887,8
@@
static void bpf_object__sanitize_btf_ext(struct bpf_object *obj)
static bool bpf_object__is_btf_mandatory(const struct bpf_object *obj)
{
- return obj->efile.btf_maps_shndx >= 0;
+ return obj->efile.btf_maps_shndx >= 0 ||
+ obj->nr_extern > 0;
}
static int bpf_object__init_btf(struct bpf_object *obj,