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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2005-11-07 00:59:06 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 07:53:33 -0800
commitd4b68996785326a67e9842219ab69984243ec658 (patch)
treeed929419af82f8086e82aa6dd190712a3493d122 /arch/s390/kernel/traps.c
parenta0016408f2428225f1532cbf63ca1c7008e1cc93 (diff)
[PATCH] s390: remove pagex support
Remove pagex pseudo page fault code. It does not work together with the system call speedup that makes the complete system call path enabled for interrupts. To make pagex and the syscall speedup code work together we would have to add code to the program check handler to do a critical section cleanup like the asynchronous interrupt code. This would make program checks slower. Not what we want. Newer versions of z/VM have the improved pfault pseudo page fault interface. This replaces the old pagex interface and does not have the problem. So its better to just rip out the pagex code. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/kernel/traps.c')
-rw-r--r--arch/s390/kernel/traps.c29
1 files changed, 3 insertions, 26 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 6b8703ec2ae6..c5bd36fae56b 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -57,7 +57,6 @@ int sysctl_userprocess_debug = 0;
extern pgm_check_handler_t do_protection_exception;
extern pgm_check_handler_t do_dat_exception;
-extern pgm_check_handler_t do_pseudo_page_fault;
#ifdef CONFIG_PFAULT
extern int pfault_init(void);
extern void pfault_fini(void);
@@ -676,20 +675,6 @@ asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
panic("Corrupt kernel stack, can't continue.");
}
-#ifndef CONFIG_ARCH_S390X
-static int
-pagex_reboot_event(struct notifier_block *this, unsigned long event, void *ptr)
-{
- if (MACHINE_IS_VM)
- cpcmd("SET PAGEX OFF", NULL, 0, NULL);
- return NOTIFY_DONE;
-}
-
-static struct notifier_block pagex_reboot_notifier = {
- .notifier_call = &pagex_reboot_event,
-};
-#endif
-
/* init is done in lowcore.S and head.S */
void __init trap_init(void)
@@ -717,9 +702,7 @@ void __init trap_init(void)
pgm_check_table[0x11] = &do_dat_exception;
pgm_check_table[0x12] = &translation_exception;
pgm_check_table[0x13] = &special_op_exception;
-#ifndef CONFIG_ARCH_S390X
- pgm_check_table[0x14] = &do_pseudo_page_fault;
-#else /* CONFIG_ARCH_S390X */
+#ifdef CONFIG_ARCH_S390X
pgm_check_table[0x38] = &do_dat_exception;
pgm_check_table[0x39] = &do_dat_exception;
pgm_check_table[0x3A] = &do_dat_exception;
@@ -731,12 +714,10 @@ void __init trap_init(void)
pgm_check_table[0x40] = &do_monitor_call;
if (MACHINE_IS_VM) {
+#ifdef CONFIG_PFAULT
/*
- * First try to get pfault pseudo page faults going.
- * If this isn't available turn on pagex page faults.
+ * Try to get pfault pseudo page faults going.
*/
-#ifdef CONFIG_PFAULT
- /* request the 0x2603 external interrupt */
if (register_early_external_interrupt(0x2603, pfault_interrupt,
&ext_int_pfault) != 0)
panic("Couldn't request external interrupt 0x2603");
@@ -748,9 +729,5 @@ void __init trap_init(void)
unregister_early_external_interrupt(0x2603, pfault_interrupt,
&ext_int_pfault);
#endif
-#ifndef CONFIG_ARCH_S390X
- register_reboot_notifier(&pagex_reboot_notifier);
- cpcmd("SET PAGEX ON", NULL, 0, NULL);
-#endif
}
}