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libbpf: Add btf__load_vmlinux_btf/btf__load_module_btf

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Add two new APIs: btf__load_vmlinux_btf and btf__load_module_btf.
btf__load_vmlinux_btf is just an alias to the existing API named
libbpf_find_kernel_btf, rename to be more precisely and consistent
with existing BTF APIs. btf__load_module_btf can be used to load
module BTF, add it for completeness. These two APIs are useful for
implementing tracing tools and introspection tools. This is part
of the effort towards libbpf 1.0 ([0]).

  [0] Closes: https://github.com/libbpf/libbpf/issues/280

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210730114012.494408-1-hengqi.chen@gmail.com
This commit is contained in:
Hengqi Chen 2021-07-30 19:40:12 +08:00 • committed by Andrii Nakryiko
parent f309b4ba98
commit a710eed386
4 changed files with 20 additions and 6 deletions
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4
tools/lib/bpf/libbpf.c
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@ -2680,7 +2680,7 @@ static int bpf_object__load_vmlinux_btf(struct bpf_object *obj, bool force)
if (!force && !obj_needs_vmlinux_btf(obj))
return 0;
obj->btf_vmlinux = libbpf_find_kernel_btf();
obj->btf_vmlinux = btf__load_vmlinux_btf();
err = libbpf_get_error(obj->btf_vmlinux);
if (err) {
pr_warn("Error loading vmlinux BTF: %d\n", err);
@ -8297,7 +8297,7 @@ int libbpf_find_vmlinux_btf_id(const char *name,
struct btf *btf;
int err;
btf = libbpf_find_kernel_btf();
btf = btf__load_vmlinux_btf();
err = libbpf_get_error(btf);
if (err) {
pr_warn("vmlinux BTF is not found\n");