Unnamed

diff --git a/mm/memory.c b/mm/memory.cindex 4e23287..4122947 100644--- a/mm/memory.c+++ b/mm/memory.c@@ -2792,24 +2792,23 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma, 	spinlock_t *ptl; 	pte_t entry; -	if (check_stack_guard_page(vma, address) < 0) {-		pte_unmap(page_table);+	pte_unmap(page_table);++	/* Check if we need to add a guard page to the stack */+	if (check_stack_guard_page(vma, address) < 0) 		return VM_FAULT_SIGBUS;-	} +	/* Use the zero-page for reads */ 	if (!(flags & FAULT_FLAG_WRITE)) { 		entry = pte_mkspecial(pfn_pte(my_zero_pfn(address), 						vma->vm_page_prot));-		ptl = pte_lockptr(mm, pmd);-		spin_lock(ptl);+		page_table = pte_offset_map_lock(mm, pmd, address, &ptl); 		if (!pte_none(*page_table)) 			goto unlock; 		goto setpte; 	}  	/* Allocate our own private page. */-	pte_unmap(page_table);- 	if (unlikely(anon_vma_prepare(vma))) 		goto oom; 	page = alloc_zeroed_user_highpage_movable(vma, address);-- 1.7.0.4