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Subject[PATCH] mm: Change count_mm_mlocked_page_nr return type
Date
From: swkhack <swkhack@gmail.com>

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 <swkhack@gmail.com>
---
mm/mlock.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mlock.c b/mm/mlock.c
index 080f3b364..d614163f5 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -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
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