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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-07 12:12:32 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-24 17:17:00 +0200
commit127c1feffff8078400f01372712c600d0f9eef51 (patch)
tree70c6b13e0b483459bf5e6669ac0973b35bab7c48 /arch/s390/mm
parent6cef30034c32ebe448c844089c4168c411feeb63 (diff)
s390/mm: do not initialize storage keys
With dirty and referenced bits implemented in software it is unnecessary to initialize the storage key for every page. With this patch not a single storage key operation is done for a system that does not use KVM. For KVM set_pte_at/pgste_set_key will do the initialization for the guest view of the storage key when the mapping for the page is established in the host. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/pageattr.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index 990397420e6..8400f494623 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -9,6 +9,7 @@
#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"
@@ -16,7 +17,7 @@ static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
return addr;
}
-void storage_key_init_range(unsigned long start, unsigned long end)
+void __storage_key_init_range(unsigned long start, unsigned long end)
{
unsigned long boundary, size;
@@ -36,6 +37,7 @@ void storage_key_init_range(unsigned long start, unsigned long end)
start += PAGE_SIZE;
}
}
+#endif
static pte_t *walk_page_table(unsigned long addr)
{