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libbpf: Expose bpf_find_kernel_btf as a LIBBPF_API

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This patch exposes bpf_find_kernel_btf() as a LIBBPF_API.
It will be used in 'bpftool map dump' in a following patch
to dump a map with btf_vmlinux_value_type_id set.

bpf_find_kernel_btf() is renamed to libbpf_find_kernel_btf()
and moved to btf.c.  As <linux/kernel.h> is included,
some of the max/min type casting needs to be fixed.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200115230031.1102305-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau
2020-01-15 15:00:31 -08:00
committed by Andrii Nakryiko
parent d91f681d3b
commit bd35a43bb3
4 changed files with 102 additions and 96 deletions
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2
src/btf.h
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@@ -102,6 +102,8 @@ LIBBPF_API int btf_ext__reloc_line_info(const struct btf *btf,
LIBBPF_API __u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext);
LIBBPF_API __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext);
LIBBPF_API struct btf *libbpf_find_kernel_btf(void);
struct btf_dedup_opts {
unsigned int dedup_table_size;
bool dont_resolve_fwds;