tools/virtio: add ucopysize.h stub

Add ucopysize.h with stub implementations of check_object_size,
copy_overflow, and check_copy_size.

Created using Cursor CLI.

Message-ID: <[e-mail]>
Acked-by: Jason Wang <[e-mail]>
Signed-off-by: Michael S. Tsirkin <[e-mail]>

tools/virtio/linux/ucopysize.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_UCOPYSIZE_H__
+#define __LINUX_UCOPYSIZE_H__
+
+#include <linux/bug.h>
+
+static inline void check_object_size(const void *ptr, unsigned long n,
+				     bool to_user)
+{ }
+
+static inline void copy_overflow(int size, unsigned long count)
+{
+}
+
+static __always_inline __must_check bool
+check_copy_size(const void *addr, size_t bytes, bool is_source)
+{
+	return true;
+}
+
+#endif /* __LINUX_UCOPYSIZE_H__ */