1 files changed, 8 insertions, 14 deletions

diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
index 4198798e1469..1a17b0733ab5 100644
--- a/arch/x86_64/mm/fault.c
+++ b/arch/x86_64/mm/fault.c
@@ -40,8 +40,7 @@
 #define PF_RSVD (1<<3)
 #define PF_INSTR        (1<<4)
 
-#ifdef CONFIG_KPROBES
-ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
+static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
 
 /* Hook to register for page fault notifications */
 int register_page_fault_notifier(struct notifier_block *nb)
@@ -49,11 +48,13 @@ int register_page_fault_notifier(struct notifier_block *nb)
         vmalloc_sync_all();
         return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
 }
+EXPORT_SYMBOL_GPL(register_page_fault_notifier);
 
 int unregister_page_fault_notifier(struct notifier_block *nb)
 {
         return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
 }
+EXPORT_SYMBOL_GPL(unregister_page_fault_notifier);
 
 static inline int notify_page_fault(enum die_val val, const char *str,
                         struct pt_regs *regs, long err, int trap, int sig)
@@ -67,13 +68,6 @@ static inline int notify_page_fault(enum die_val val, const char *str,
         };
         return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
 }
-#else
-static inline int notify_page_fault(enum die_val val, const char *str,
-                        struct pt_regs *regs, long err, int trap, int sig)
-{
-        return NOTIFY_DONE;
-}
-#endif
 
 void bust_spinlocks(int yes)
 {
@@ -102,7 +96,7 @@ void bust_spinlocks(int yes)
 static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
                                 unsigned long error_code)
 { 
-        unsigned char *instr;
+        unsigned char __user *instr;
         int scan_more = 1;
         int prefetch = 0; 
         unsigned char *max_instr;
@@ -111,7 +105,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
         if (error_code & PF_INSTR)
                 return 0;
         
-        instr = (unsigned char *)convert_rip_to_linear(current, regs);
+        instr = (unsigned char __user *)convert_rip_to_linear(current, regs);
         max_instr = instr + 15;
 
         if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE)
@@ -122,7 +116,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
                 unsigned char instr_hi;
                 unsigned char instr_lo;
 
-                if (__get_user(opcode, instr))
+                if (__get_user(opcode, (char __user *)instr))
                         break; 
 
                 instr_hi = opcode & 0xf0; 
@@ -160,7 +154,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
                 case 0x00:
                         /* Prefetch instruction is 0x0F0D or 0x0F18 */
                         scan_more = 0;
-                        if (__get_user(opcode, instr)) 
+                        if (__get_user(opcode, (char __user *)instr))
                                 break;
                         prefetch = (instr_lo == 0xF) &&
                                 (opcode == 0x0D || opcode == 0x18);
@@ -176,7 +170,7 @@ static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr,
 static int bad_address(void *p) 
 { 
         unsigned long dummy;
-        return __get_user(dummy, (unsigned long *)p);
+        return __get_user(dummy, (unsigned long __user *)p);
 } 
 
 void dump_pagetable(unsigned long address)