From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 20 Mar 2017 13:29:50 +0000 (+0100)
Subject: s390/facilites: use stfle_fac_list array size for MAX_FACILITY_BIT
X-Git-Tag: v4.9.99~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bce133ab7d4c4799949478fc7897cc335f3042e9;p=platform%2Fkernel%2Flinux-amlogic.git

s390/facilites: use stfle_fac_list array size for MAX_FACILITY_BIT

commit 6f5165e864d240d15675cc2fb5a369d57e1f60d0 upstream.

Use the actual size of the facility list array within the lowcore
structure for the MAX_FACILITY_BIT define instead of a comment which
states what this is good for. This makes it a bit harder to break
things.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/s390/include/asm/facility.h b/arch/s390/include/asm/facility.h
index 7a8a1457dbb8..5811e7849a2e 100644
--- a/arch/s390/include/asm/facility.h
+++ b/arch/s390/include/asm/facility.h
@@ -15,7 +15,7 @@
 #include <linux/preempt.h>
 #include <asm/lowcore.h>
 
-#define MAX_FACILITY_BIT (256*8)	/* stfle_fac_list has 256 bytes */
+#define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
 
 static inline void __set_facility(unsigned long nr, void *facilities)
 {