Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index b3e8db3..e6c30ce 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -44,7 +44,7 @@
 	newsp = (oldsp - frame_size) & ~0xFUL;
 
 	/* Check access */
-	if (!access_ok(VERIFY_WRITE, (void __user *)newsp, oldsp - newsp))
+	if (!access_ok((void __user *)newsp, oldsp - newsp))
 		return NULL;
 
         return (void __user *)newsp;