mm: Change count_mm_mlocked_page_nr return type

From: swkhack <[email protected]>

In 64-bit machine,the value of "vma->vm_end - vma->vm_start" maybe negative in 32bit int and the "count >> PAGE_SHIFT"'s rusult

will be wrong.So change the local variable and return value to unsigned long will fix the problem.

Signed-off-by swkhack <[email protected]>

---
 mm/mlock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

mm/mlock.c +2 -3

index 080f3b364..d614163f5 100644
@@ -636,11 +636,11 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
  * is also counted.
  * Return value: previously mlocked page counts
  */
-static int count_mm_mlocked_page_nr(struct mm_struct *mm,
+static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
                unsigned long start, size_t len)
 {
        struct vm_area_struct *vma;
-       int count = 0;
+       unsigned long count = 0;
 
        if (mm == NULL)
                mm = current->mm;
--

2.17.1