Merge branch 's5p-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[mv-sheeva.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index 2ed2267439df0f894011ab62adef6d7efe68db9a..6b2ab10518512052c895dd5db7ff0f20fd1df2f3 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2760,11 +2760,9 @@ out_release:
 }
 
 /*
- * This is like a special single-page "expand_downwards()",
- * except we must first make sure that 'address-PAGE_SIZE'
+ * This is like a special single-page "expand_{down|up}wards()",
+ * except we must first make sure that 'address{-|+}PAGE_SIZE'
  * doesn't hit another vma.
- *
- * The "find_vma()" will do the right thing even if we wrap
  */
 static inline int check_stack_guard_page(struct vm_area_struct *vma, unsigned long address)
 {
@@ -2783,6 +2781,15 @@ static inline int check_stack_guard_page(struct vm_area_struct *vma, unsigned lo
 
                expand_stack(vma, address - PAGE_SIZE);
        }
+       if ((vma->vm_flags & VM_GROWSUP) && address + PAGE_SIZE == vma->vm_end) {
+               struct vm_area_struct *next = vma->vm_next;
+
+               /* As VM_GROWSDOWN but s/below/above/ */
+               if (next && next->vm_start == address + PAGE_SIZE)
+                       return next->vm_flags & VM_GROWSUP ? 0 : -ENOMEM;
+
+               expand_upwards(vma, address + PAGE_SIZE);
+       }
        return 0;
 }