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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>
This commit is contained in:
Wu Fengguang 2011-11-07 19:19:28 +08:00
parent 31555213f0
commit 3a73dbbc9b
1 changed files with 4 additions and 4 deletions
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8
mm/page-writeback.c
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@ -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,