From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Tue, 14 Jun 2016 04:55:43 +0000 (+0200)
Subject: s390/mm: fix compile for PAGE_DEFAULT_KEY != 0
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=de3fa841e429de7e288facf9b642948677fac581;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

s390/mm: fix compile for PAGE_DEFAULT_KEY != 0

The usual problem for code that is ifdef'ed out is that it doesn't
compile after a while. That's also the case for the storage key
initialisation code, if it would be used (set PAGE_DEFAULT_KEY to
something not zero):

./arch/s390/include/asm/page.h: In function 'storage_key_init_range':
./arch/s390/include/asm/page.h:36:2: error: implicit declaration of function '__storage_key_init_range'

Since the code itself has been useful for debugging purposes several
times, remove the ifdefs and make sure the code gets compiler
coverage. The cost for this is eight bytes.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 53eacbd4f09b..42fd5fea42ee 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -30,11 +30,12 @@
 #include <asm/setup.h>
 #ifndef __ASSEMBLY__
 
+void __storage_key_init_range(unsigned long start, unsigned long end);
+
 static inline void storage_key_init_range(unsigned long start, unsigned long end)
 {
-#if PAGE_DEFAULT_KEY
-	__storage_key_init_range(start, end);
-#endif
+	if (PAGE_DEFAULT_KEY)
+		__storage_key_init_range(start, end);
 }
 
 #define clear_page(page)	memset((page), 0, PAGE_SIZE)
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index ba124d9c96ba..7104ffb5a67f 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -10,7 +10,6 @@
 #include <asm/pgtable.h>
 #include <asm/page.h>
 
-#if PAGE_DEFAULT_KEY
 static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
 {
 	asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
@@ -22,6 +21,8 @@ void __storage_key_init_range(unsigned long start, unsigned long end)
 {
 	unsigned long boundary, size;
 
+	if (!PAGE_DEFAULT_KEY)
+		return;
 	while (start < end) {
 		if (MACHINE_HAS_EDAT1) {
 			/* set storage keys for a 1MB frame */
@@ -38,7 +39,6 @@ void __storage_key_init_range(unsigned long start, unsigned long end)
 		start += PAGE_SIZE;
 	}
 }
-#endif
 
 #ifdef CONFIG_PROC_FS
 atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];