diff mbox series

[v12,bpf-next,02/14] tools resolve_btfids: Add support for set symbols

Message ID 20200825192124.710397-3-jolsa@kernel.org
State Accepted
Delegated to: BPF Maintainers
Headers show
Series bpf: Add d_path helper | expand

Commit Message

Jiri Olsa Aug. 25, 2020, 7:21 p.m. UTC 
The set symbol does not have the unique number suffix,
so we need to give it a special parsing function.

This was omitted in the first batch, because there was
no set support yet, so it slipped in the testing.

Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/bpf/resolve_btfids/main.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)
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Patch

diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index 35a172d3d80d..6152d1356d7b 100644
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -227,6 +227,24 @@  static char *get_id(const char *prefix_end)
 	return id;
 }
 
+static struct btf_id *add_set(struct object *obj, char *name)
+{
+	/*
+	 * __BTF_ID__set__name
+	 * name =    ^
+	 * id   =         ^
+	 */
+	char *id = name + sizeof(BTF_SET "__") - 1;
+	int len = strlen(name);
+
+	if (id >= name + len) {
+		pr_err("FAILED to parse set name: %s\n", name);
+		return NULL;
+	}
+
+	return btf_id__add(&obj->sets, id, true);
+}
+
 static struct btf_id *add_symbol(struct rb_root *root, char *name, size_t size)
 {
 	char *id;
@@ -383,7 +401,7 @@  static int symbols_collect(struct object *obj)
 			id = add_symbol(&obj->funcs, prefix, sizeof(BTF_FUNC) - 1);
 		/* set */
 		} else if (!strncmp(prefix, BTF_SET, sizeof(BTF_SET) - 1)) {
-			id = add_symbol(&obj->sets, prefix, sizeof(BTF_SET) - 1);
+			id = add_set(obj, prefix);
 			/*
 			 * SET objects store list's count, which is encoded
 			 * in symbol's size, together with 'cnt' field hence