target/linux/brcm2708/patches-3.18/0044-vmstat-Workaround-for-issue-where-dirty-page-count-g.patch

   1 From de30840b98e508ea9d650570686e35b1a64c900c 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 044/114] 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 diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
  15 index 82e7db7..f87d16d 100644
  16 --- a/include/linux/vmstat.h
  17 +++ b/include/linux/vmstat.h
  18 @@ -241,7 +241,11 @@ static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
  19  static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
  20  {
  21         atomic_long_dec(&zone->vm_stat[item]);
  22 +       if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&zone->vm_stat[item]) < 0))
  23 +               atomic_long_set(&zone->vm_stat[item], 0);
  24         atomic_long_dec(&vm_stat[item]);
  25 +       if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&vm_stat[item]) < 0))
  26 +               atomic_long_set(&vm_stat[item], 0);
  27  }
  28
  29  static inline void __inc_zone_page_state(struct page *page,
  30 --
  31 1.8.3.2
  32