[RFC bpf-next 2/3] libbpf: bpf__find_by_name[_kind] should use btf__get_nr_types()

[Alan Maguire]

When operating on split BTF, btf__find_by_name[_kind] will not
iterate over all types since they use btf->nr_types to show
the number of types to iterate over.  For split BTF this is
the number of types _on top of base BTF_, so it will
underestimate the number of types to iterate over, especially
for vmlinux + module BTF, where the latter is much smaller.

Use btf__get_nr_types() instead.

Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
---
 tools/lib/bpf/btf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 2d0d064..0fccf4b 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -679,7 +679,7 @@ __s32 btf__find_by_name(const struct btf *btf, const char *type_name)
 	if (!strcmp(type_name, "void"))
 		return 0;
 
-	for (i = 1; i <= btf->nr_types; i++) {
+	for (i = 1; i <= btf__get_nr_types(btf); i++) {
 		const struct btf_type *t = btf__type_by_id(btf, i);
 		const char *name = btf__name_by_offset(btf, t->name_off);
 
@@ -698,7 +698,7 @@ __s32 btf__find_by_name_kind(const struct btf *btf, const char *type_name,
 	if (kind == BTF_KIND_UNKN || !strcmp(type_name, "void"))
 		return 0;
 
-	for (i = 1; i <= btf->nr_types; i++) {
+	for (i = 1; i <= btf__get_nr_types(btf); i++) {
 		const struct btf_type *t = btf__type_by_id(btf, i);
 		const char *name;
 
-- 
1.8.3.1