ARM: 9128/1: mm: Refactor the __do_page_fault()

Clean up the multiple goto statements and drops local variable
vm_fault_t fault, which will make the __do_page_fault() much more
readability.

No functional change.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

arch/arm/mm/fault.c

@@ -205,35 +205,27 @@ __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
 		unsigned int flags, struct task_struct *tsk,
 		struct pt_regs *regs)
 {
-	struct vm_area_struct *vma;
-	vm_fault_t fault;
-
-	vma = find_vma(mm, addr);
-	fault = VM_FAULT_BADMAP;
+	struct vm_area_struct *vma = find_vma(mm, addr);
 	if (unlikely(!vma))
-		goto out;
-	if (unlikely(vma->vm_start > addr))
-		goto check_stack;
+		return VM_FAULT_BADMAP;
+
+	if (unlikely(vma->vm_start > addr)) {
+		if (!(vma->vm_flags & VM_GROWSDOWN))
+			return VM_FAULT_BADMAP;
+		if (addr < FIRST_USER_ADDRESS)
+			return VM_FAULT_BADMAP;
+		if (expand_stack(vma, addr))
+			return VM_FAULT_BADMAP;
+	}
 
 	/*
 	 * Ok, we have a good vm_area for this
 	 * memory access, so we can handle it.
 	 */
-good_area:
-	if (access_error(fsr, vma)) {
-		fault = VM_FAULT_BADACCESS;
-		goto out;
-	}
+	if (access_error(fsr, vma))
+		return VM_FAULT_BADACCESS;
 
 	return handle_mm_fault(vma, addr & PAGE_MASK, flags, regs);
-
-check_stack:
-	/* Don't allow expansion below FIRST_USER_ADDRESS */
-	if (vma->vm_flags & VM_GROWSDOWN &&
-	    addr >= FIRST_USER_ADDRESS && !expand_stack(vma, addr))
-		goto good_area;
-out:
-	return fault;
 }
 
 static int __kprobes