[POWERPC] iSeries: Localise and constify some iSeries data

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/include/asm-powerpc/iseries/alpaca.h b/include/asm-powerpc/iseries/alpaca.h
index 26fc081..c0cce67 100644
--- a/include/asm-powerpc/iseries/alpaca.h
+++ b/include/asm-powerpc/iseries/alpaca.h
@@ -25,7 +25,7 @@
  */
 struct alpaca {
 	struct lppaca *lppaca_ptr;	/* Pointer to LpPaca for PLIC */
-	void *reg_save_ptr;		/* Pointer to LpRegSave for PLIC */
+	const void *reg_save_ptr;	/* Pointer to LpRegSave for PLIC */
 };
 
 #endif /* _ASM_POWERPC_ISERIES_ALPACA_H */