openwrtv4/target/linux/brcm2708/patches-4.1/0045-vmstat-Workaround-for-issue-where-dirty-page-count-g.patch
Felix Fietkau 0b5d87fd30 brcm2708: update 4.1 patches
As usual, this patches were taken (and rebased) from
https://github.com/raspberrypi/linux/commits/rpi-4.1.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 46853
2015-09-11 16:32:00 +00:00

27 lines
1,013 B
Diff

From 60c815a4d391146705c0213642be0e3568ea1b7b Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 18 Jun 2014 13:42:01 +0100
Subject: [PATCH 045/171] vmstat: Workaround for issue where dirty page count
goes negative
See:
https://github.com/raspberrypi/linux/issues/617
http://www.spinics.net/lists/linux-mm/msg72236.html
---
include/linux/vmstat.h | 4 ++++
1 file changed, 4 insertions(+)
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -241,7 +241,11 @@ static inline void __inc_zone_state(stru
static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
{
atomic_long_dec(&zone->vm_stat[item]);
+ if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&zone->vm_stat[item]) < 0))
+ atomic_long_set(&zone->vm_stat[item], 0);
atomic_long_dec(&vm_stat[item]);
+ if (item == NR_FILE_DIRTY && unlikely(atomic_long_read(&vm_stat[item]) < 0))
+ atomic_long_set(&vm_stat[item], 0);
}
static inline void __inc_zone_page_state(struct page *page,