parisc: Use __ro_after_init in head.S

Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
index d12de2a..951a339 100644
--- a/arch/parisc/kernel/head.S
+++ b/arch/parisc/kernel/head.S
@@ -376,7 +376,7 @@
 ENDPROC(parisc_kernel_start)
 
 #ifndef CONFIG_64BIT
-	.section .data..read_mostly
+	.section .data..ro_after_init
 
 	.align	4
 	.export	$global$,data