aboutsummaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
authorWu Fengguang <fengguang.wu@intel.com>2011-11-07 19:19:28 +0800
committerWu Fengguang <fengguang.wu@intel.com>2011-11-07 19:19:28 +0800
commit3a73dbbc9bb3fc8594cd67af4db6c563175dfddb (patch)
treee5120c19fd8e83a38d5c0852336a92c5b7862c6a /mm
parent31555213f03bca37d2c02e10946296052f4ecfcd (diff)
downloadlinux-stericsson-3a73dbbc9bb3fc8594cd67af4db6c563175dfddb.tar.gz
writeback: fix uninitialized task_ratelimit
In balance_dirty_pages() task_ratelimit may be not initialized (initialization skiped by goto pause), and then used when calling tracing hook. Fix it by moving the task_ratelimit assignment before goto pause. Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/page-writeback.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0360d1b5a1dd..a3278f005230 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1097,13 +1097,13 @@ static void balance_dirty_pages(struct address_space *mapping,
pos_ratio = bdi_position_ratio(bdi, dirty_thresh,
background_thresh, nr_dirty,
bdi_thresh, bdi_dirty);
- if (unlikely(pos_ratio == 0)) {
+ task_ratelimit = ((u64)dirty_ratelimit * pos_ratio) >>
+ RATELIMIT_CALC_SHIFT;
+ if (unlikely(task_ratelimit == 0)) {
pause = max_pause;
goto pause;
}
- task_ratelimit = (u64)dirty_ratelimit *
- pos_ratio >> RATELIMIT_CALC_SHIFT;
- pause = (HZ * pages_dirtied) / (task_ratelimit | 1);
+ pause = HZ * pages_dirtied / task_ratelimit;
if (unlikely(pause <= 0)) {
trace_balance_dirty_pages(bdi,
dirty_thresh,