[S390] pfault code cleanup.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 1c323bb..cd85e34 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -31,6 +31,7 @@
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/kdebug.h>
+#include <asm/s390_ext.h>
#ifndef CONFIG_64BIT
#define __FAIL_ADDR_MASK 0x7ffff000
@@ -394,6 +395,7 @@
/*
* 'pfault' pseudo page faults routines.
*/
+static ext_int_info_t ext_int_pfault;
static int pfault_disable = 0;
static int __init nopfault(char *str)
@@ -422,7 +424,7 @@
__PF_RES_FIELD };
int rc;
- if (pfault_disable)
+ if (!MACHINE_IS_VM || pfault_disable)
return -1;
asm volatile(
" diag %1,%0,0x258\n"
@@ -440,7 +442,7 @@
pfault_refbk_t refbk =
{ 0x258, 1, 5, 2, 0ULL, 0ULL, 0ULL, 0ULL };
- if (pfault_disable)
+ if (!MACHINE_IS_VM || pfault_disable)
return;
__ctl_clear_bit(0,9);
asm volatile(
@@ -500,5 +502,25 @@
set_tsk_need_resched(tsk);
}
}
-#endif
+void __init pfault_irq_init(void)
+{
+ if (!MACHINE_IS_VM)
+ return;
+
+ /*
+ * Try to get pfault pseudo page faults going.
+ */
+ if (register_early_external_interrupt(0x2603, pfault_interrupt,
+ &ext_int_pfault) != 0)
+ panic("Couldn't request external interrupt 0x2603");
+
+ if (pfault_init() == 0)
+ return;
+
+ /* Tough luck, no pfault. */
+ pfault_disable = 1;
+ unregister_early_external_interrupt(0x2603, pfault_interrupt,
+ &ext_int_pfault);
+}
+#endif