[PATCH v9 07/10] io_uring/mini_liburing: add io_uring_register()

[Pavel Begunkov <asml.silence@gmail.com>]

Add a helper for io_uring registration syscall, which will later be used
for region creation. Keep it generic, it's good enough for now. Later it
can be turned into a separate region API, but I'd rather have liburing
introducing it first and copy from there, than the other way around.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 tools/include/io_uring/mini_liburing.h | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/tools/include/io_uring/mini_liburing.h b/tools/include/io_uring/mini_liburing.h
index 81513b82433a..ee75cfc24d84 100644
--- a/tools/include/io_uring/mini_liburing.h
+++ b/tools/include/io_uring/mini_liburing.h
@@ -70,6 +70,15 @@ struct io_uring {
 #define write_barrier()	__sync_synchronize()
 #endif
 
+static inline int io_uring_register(unsigned int fd, unsigned int opcode,
+				    const void *arg, unsigned int nr_args)
+{
+	int ret;
+
+	ret = syscall(__NR_io_uring_register, fd, opcode, arg, nr_args);
+	return (ret < 0) ? -errno : ret;
+}
+
 static inline int io_uring_mmap(int fd, struct io_uring_params *p,
 				struct io_uring_sq *sq, struct io_uring_cq *cq)
 {
@@ -280,11 +289,8 @@ static inline int io_uring_register_buffers(struct io_uring *ring,
 					    const struct iovec *iovecs,
 					    unsigned int nr_iovecs)
 {
-	int ret;
-
-	ret = syscall(__NR_io_uring_register, ring->ring_fd,
-		      IORING_REGISTER_BUFFERS, iovecs, nr_iovecs);
-	return (ret < 0) ? -errno : ret;
+	return io_uring_register(ring->ring_fd, IORING_REGISTER_BUFFERS,
+				 iovecs, nr_iovecs);
 }
 
 static inline void io_uring_prep_send(struct io_uring_sqe *sqe, int sockfd,
-- 
2.53.0