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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-28 13:21:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-28 13:21:44 -0800
commitde1a2262b006220dae2561a299a6ea128c46f4fe (patch)
tree0df7b3686f09a77a000fb63a333237facad3482c /mm
parentf042fea0da78d9dc077a9c736b33b60eb8f35195 (diff)
parented84825b785ceb932af7dd5aa08614801721320b (diff)
downloadvexpress-lsk-de1a2262b006220dae2561a299a6ea128c46f4fe.tar.gz
Merge tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
Pull writeback fixes from Wu Fengguang: "Two writeback fixes - fix negative (setpoint - dirty) in 32bit archs - use down_read_trylock() in writeback_inodes_sb(_nr)_if_idle()" * tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: Negative (setpoint-dirty) in bdi_position_ratio() vfs: re-implement writeback_inodes_sb(_nr)_if_idle() and rename them
Diffstat (limited to 'mm')
-rw-r--r--mm/page-writeback.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 742c4058315..efe68148f62 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -696,7 +696,7 @@ static unsigned long bdi_position_ratio(struct backing_dev_info *bdi,
* => fast response on large errors; small oscillation near setpoint
*/
setpoint = (freerun + limit) / 2;
- x = div_s64((setpoint - dirty) << RATELIMIT_CALC_SHIFT,
+ x = div_s64(((s64)setpoint - (s64)dirty) << RATELIMIT_CALC_SHIFT,
limit - setpoint + 1);
pos_ratio = x;
pos_ratio = pos_ratio * x >> RATELIMIT_CALC_SHIFT;