x86: use helper in fault_64.c

Use the fixup_exception() helper in fault_64.c
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/mm/fault_64.c

@@ -298,7 +298,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 	struct mm_struct *mm;
 	struct vm_area_struct * vma;
 	unsigned long address;
-	const struct exception_table_entry *fixup;
 	int write, fault;
 	unsigned long flags;
 	siginfo_t info;
@@ -508,9 +507,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 no_context:
 	
 	/* Are we prepared to handle this kernel fault?  */
-	fixup = search_exception_tables(regs->ip);
-	if (fixup) {
-		regs->ip = fixup->fixup;
+	if (fixup_exception(regs)) {
 		return;
 	}
 

include/asm-x86/uaccess_64.h

@@ -65,6 +65,8 @@ struct exception_table_entry
 	unsigned long insn, fixup;
 };
 
+extern int fixup_exception(struct pt_regs *regs);
+
 #define ARCH_HAS_SEARCH_EXTABLE
 
 /*