diff --git a/tools/build/checkstyle9.pl b/tools/build/checkstyle9.pl
--- a/tools/build/checkstyle9.pl
+++ b/tools/build/checkstyle9.pl
@@ -202,6 +202,7 @@
 # Notes to $Attribute:
 our $Attribute	= qr{
 			const|
+			_*restrict|
 			volatile|
 			QEMU_NORETURN|
 			QEMU_WARN_UNUSED_RESULT|