target/linux/brcm2708/patches-4.4/0003-vmstat-Workaround-for-issue-where-dirty-page-count-g.patch

   1 From d5cb475205138f9df1fdbb74d8810ab1928696ea Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Wed, 18 Jun 2014 13:42:01 +0100
   4 Subject: [PATCH 003/170] vmstat: Workaround for issue where dirty page count
   5  goes negative
   6
   7 See:
   8 https://github.com/raspberrypi/linux/issues/617
   9 http://www.spinics.net/lists/linux-mm/msg72236.html
  10 ---
  11  include/linux/vmstat.h | 4 ++++
  12  1 file changed, 4 insertions(+)
  13
  14 --- a/include/linux/vmstat.h
  15 +++ b/include/linux/vmstat.h
  16 @@ -219,7 +219,11 @@ static inline void __inc_zone_state(stru
  17  static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
  18  {
  19         atomic_long_dec(&zone->vm_stat[item]);
  20 +       if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&zone->vm_stat[item]) < 0))
  21 +               atomic_long_set(&zone->vm_stat[item], 0);
  22         atomic_long_dec(&vm_stat[item]);
  23 +       if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&vm_stat[item]) < 0))
  24 +               atomic_long_set(&vm_stat[item], 0);
  25  }
  26
  27  static inline void __inc_zone_page_state(struct page *page,