io_uring: make io_kiocb_to_cmd() typesafe

[linux-2.6-microblaze.git] / include / linux / io_uring_types.h

diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index f7fab37..677a25d 100644 (file)
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -491,7 +491,14 @@ struct io_cmd_data {
        __u8                    data[56];
 };
 
-#define io_kiocb_to_cmd(req)   ((void *) &(req)->cmd)
+static inline void io_kiocb_cmd_sz_check(size_t cmd_sz)
+{
+       BUILD_BUG_ON(cmd_sz > sizeof(struct io_cmd_data));
+}
+#define io_kiocb_to_cmd(req, cmd_type) ( \
+       io_kiocb_cmd_sz_check(sizeof(cmd_type)) , \
+       ((cmd_type *)&(req)->cmd) \
+)
 #define cmd_to_io_kiocb(ptr)   ((struct io_kiocb *) ptr)
 
 struct io_kiocb {