[S390] pfault: Fix alignment of parameter list.

[linux-2.6] / arch / s390 / mm / fault.c

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 2b76a879a7b5455f92c3ccd9e2009b98e8393b8c..4c1ac341ec80633c95194f3c83ab7f358b36189a 100644 (file)
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -20,6 +20,7 @@
 #include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
+#include <linux/kdebug.h>
 #include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/console.h>
@@ -30,7 +31,6 @@
 
 #include <asm/system.h>
 #include <asm/pgtable.h>
-#include <asm/kdebug.h>
 #include <asm/s390_ext.h>
 
 #ifndef CONFIG_64BIT
@@ -52,38 +52,24 @@ extern int sysctl_userprocess_debug;
 extern void die(const char *,struct pt_regs *,long);
 
 #ifdef CONFIG_KPROBES
-static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
-int register_page_fault_notifier(struct notifier_block *nb)
-{
-       return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
-}
-
-int unregister_page_fault_notifier(struct notifier_block *nb)
-{
-       return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
-}
-
-static int __kprobes __notify_page_fault(struct pt_regs *regs, long err)
-{
-       struct die_args args = { .str = "page fault",
-                                .trapnr = 14,
-                                .signr = SIGSEGV };
-       args.regs = regs;
-       args.err = err;
-       return atomic_notifier_call_chain(&notify_page_fault_chain,
-                                         DIE_PAGE_FAULT, &args);
-}
-
 static inline int notify_page_fault(struct pt_regs *regs, long err)
 {
-       if (unlikely(kprobe_running()))
-               return __notify_page_fault(regs, err);
-       return NOTIFY_DONE;
+       int ret = 0;
+
+       /* kprobe_running() needs smp_processor_id() */
+       if (!user_mode(regs)) {
+               preempt_disable();
+               if (kprobe_running() && kprobe_fault_handler(regs, 14))
+                       ret = 1;
+               preempt_enable();
+       }
+
+       return ret;
 }
 #else
 static inline int notify_page_fault(struct pt_regs *regs, long err)
 {
-       return NOTIFY_DONE;
+       return 0;
 }
 #endif
 
@@ -267,7 +253,10 @@ static int signal_return(struct mm_struct *mm, struct pt_regs *regs,
                         unsigned long address, unsigned long error_code)
 {
        u16 instruction;
-       int rc, compat;
+       int rc;
+#ifdef CONFIG_COMPAT
+       int compat;
+#endif
 
        pagefault_disable();
        rc = __get_user(instruction, (u16 __user *) regs->psw.addr);
@@ -318,8 +307,9 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int write)
        unsigned long address;
        int space;
        int si_code;
+       int fault;
 
-       if (notify_page_fault(regs, error_code) == NOTIFY_STOP)
+       if (notify_page_fault(regs, error_code))
                return;
 
        tsk = current;
@@ -388,23 +378,22 @@ survive:
         * make sure we exit gracefully rather than endlessly redo
         * the fault.
         */
-       switch (handle_mm_fault(mm, vma, address, write)) {
-       case VM_FAULT_MINOR:
-               tsk->min_flt++;
-               break;
-       case VM_FAULT_MAJOR:
-               tsk->maj_flt++;
-               break;
-       case VM_FAULT_SIGBUS:
-               do_sigbus(regs, error_code, address);
-               return;
-       case VM_FAULT_OOM:
-               if (do_out_of_memory(regs, error_code, address))
-                       goto survive;
-               return;
-       default:
+       fault = handle_mm_fault(mm, vma, address, write);
+       if (unlikely(fault & VM_FAULT_ERROR)) {
+               if (fault & VM_FAULT_OOM) {
+                       if (do_out_of_memory(regs, error_code, address))
+                               goto survive;
+                       return;
+               } else if (fault & VM_FAULT_SIGBUS) {
+                       do_sigbus(regs, error_code, address);
+                       return;
+               }
                BUG();
        }
+       if (fault & VM_FAULT_MAJOR)
+               tsk->maj_flt++;
+       else
+               tsk->min_flt++;
 
         up_read(&mm->mmap_sem);
        /*
@@ -479,7 +468,7 @@ typedef struct {
        __u64 refselmk;
        __u64 refcmpmk;
        __u64 reserved;
-} __attribute__ ((packed)) pfault_refbk_t;
+} __attribute__ ((packed, aligned(8))) pfault_refbk_t;
 
 int pfault_init(void)
 {