On Tue, Jul 29, 2025 at 11:33:35AM -0400, Steven Rostedt wrote:

SNIP

+/**
+ * btf_find_offset - Find an offset of a member for a structure
+ * @arg: A structure name followed by one or more members
+ * @offset_p: A pointer to where to store the offset
+ *
+ * Will parse @arg with the expected format of: struct.member[[.member]..]
+ * It is delimited by '.'. The first item must be a structure type.
+ * The next are its members. If the member is also of a structure type it
+ * another member may follow ".member".
+ *
+ * Note, @arg is modified but will be put back to what it was on return.
+ *
+ * Returns: 0 on success and -EINVAL if no '.' is present
+ *    or -ENXIO if the structure or member is not found.
+ *    Returns -EINVAL if BTF is not defined.
+ *  On success, @offset_p will contain the offset of the member specified
+ *    by @arg.
+ */
+int btf_find_offset(char *arg, long *offset_p)
+{
+	const struct btf_type *t;
+	struct btf *btf;
+	long offset = 0;
+	char *ptr;
+	int ret;
+	s32 id;
+
+	ptr = strchr(arg, '.');
+	if (!ptr)
+		return -EINVAL;
+
+	*ptr = '\0';
+
+	id = bpf_find_btf_id(arg, BTF_KIND_STRUCT, &btf);

hi,
I think you need to call btf_put(btf) before return

jirka

+	if (id < 0)
+		goto error;
+
+	/* Get BTF_KIND_FUNC type */
+	t = btf_type_by_id(btf, id);
+
+	/* May allow more than one member, as long as they are structures */
+	do {
+		if (!t || !btf_type_is_struct(t))
+			goto error;
+
+		*ptr++ = '.';
+		arg = ptr;
+		ptr = strchr(ptr, '.');
+		if (ptr)
+			*ptr = '\0';
+
+		ret = find_member(arg, btf, &t, 0);
+		if (ret < 0)
+			goto error;
+
+		offset += ret;
+
+	} while (ptr);
+
+	*offset_p = offset;
+	return 0;
+
+error:
+	if (ptr)
+		*ptr = '.';
+	return -ENXIO;
+}

SNIP