Add io_uring_unregister_buffers(), so that kernel selftest can call it
explicitly.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 tools/include/io_uring/mini_liburing.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/include/io_uring/mini_liburing.h b/tools/include/io_uring/mini_liburing.h
index 44be4446feda..b9163a41024f 100644
--- a/tools/include/io_uring/mini_liburing.h
+++ b/tools/include/io_uring/mini_liburing.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: MIT */
 
 #include <linux/io_uring.h>
+#include <signal.h>
 #include <sys/mman.h>
 #include <sys/syscall.h>
 #include <stdio.h>
@@ -284,6 +285,15 @@ static inline int io_uring_register_buffers(struct io_uring *ring,
 	return (ret < 0) ? -errno : ret;
 }
 
+static inline int io_uring_unregister_buffers(struct io_uring *ring)
+{
+	int ret;
+
+	ret = syscall(__NR_io_uring_register, ring->ring_fd,
+		      IORING_UNREGISTER_BUFFERS, NULL, 0);
+	return (ret < 0) ? -errno : ret;
+}
+
 static inline void io_uring_prep_send(struct io_uring_sqe *sqe, int sockfd,
 				      const void *buf, size_t len, int flags)
 {
-- 
2.53.0