1 files changed, 35 insertions, 26 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 724f342bcf89..7afc7a7cec6f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1571,33 +1571,11 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
 }
 #endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */
 
-#ifdef CONFIG_STACK_GROWSUP
-int expand_stack(struct vm_area_struct *vma, unsigned long address)
-{
-        return expand_upwards(vma, address);
-}
-
-struct vm_area_struct *
-find_extend_vma(struct mm_struct *mm, unsigned long addr)
-{
-        struct vm_area_struct *vma, *prev;
-
-        addr &= PAGE_MASK;
-        vma = find_vma_prev(mm, addr, &prev);
-        if (vma && (vma->vm_start <= addr))
-                return vma;
-        if (!prev || expand_stack(prev, addr))
-                return NULL;
-        if (prev->vm_flags & VM_LOCKED) {
-                make_pages_present(addr, prev->vm_end);
-        }
-        return prev;
-}
-#else
 /*
  * vma is the first one with address < vma->vm_start.  Have to extend vma.
  */
-int expand_stack(struct vm_area_struct *vma, unsigned long address)
+static inline int expand_downwards(struct vm_area_struct *vma,
+                                   unsigned long address)
 {
         int error;
 
@@ -1634,6 +1612,38 @@ int expand_stack(struct vm_area_struct *vma, unsigned long address)
         return error;
 }
 
+int expand_stack_downwards(struct vm_area_struct *vma, unsigned long address)
+{
+        return expand_downwards(vma, address);
+}
+
+#ifdef CONFIG_STACK_GROWSUP
+int expand_stack(struct vm_area_struct *vma, unsigned long address)
+{
+        return expand_upwards(vma, address);
+}
+
+struct vm_area_struct *
+find_extend_vma(struct mm_struct *mm, unsigned long addr)
+{
+        struct vm_area_struct *vma, *prev;
+
+        addr &= PAGE_MASK;
+        vma = find_vma_prev(mm, addr, &prev);
+        if (vma && (vma->vm_start <= addr))
+                return vma;
+        if (!prev || expand_stack(prev, addr))
+                return NULL;
+        if (prev->vm_flags & VM_LOCKED)
+                make_pages_present(addr, prev->vm_end);
+        return prev;
+}
+#else
+int expand_stack(struct vm_area_struct *vma, unsigned long address)
+{
+        return expand_downwards(vma, address);
+}
+
 struct vm_area_struct *
 find_extend_vma(struct mm_struct * mm, unsigned long addr)
 {
@@ -1651,9 +1661,8 @@ find_extend_vma(struct mm_struct * mm, unsigned long addr)
         start = vma->vm_start;
         if (expand_stack(vma, addr))
                 return NULL;
-        if (vma->vm_flags & VM_LOCKED) {
+        if (vma->vm_flags & VM_LOCKED)
                 make_pages_present(addr, start);
-        }
         return vma;
 }
 #endif