[BLOCK] elevator: Make elevator=as work again for anticipatory

[pandora-kernel.git] / block / cfq-iosched.c

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 4525386..74fae2d 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1,6 +1,4 @@
 /*
- *  linux/drivers/block/cfq-iosched.c
- *
  *  CFQ, or complete fairness queueing, disk scheduler.
  *
  *  Based on ideas from a previously unfinished io
@@ -27,15 +25,15 @@
 /*
  * tunables
  */
-static int cfq_quantum = 4;            /* max queue in one round of service */
-static int cfq_queued = 8;             /* minimum rq allocate limit per-queue*/
-static int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 };
-static int cfq_back_max = 16 * 1024;   /* maximum backwards seek, in KiB */
-static int cfq_back_penalty = 2;       /* penalty of a backwards seek */
+static const int cfq_quantum = 4;              /* max queue in one round of service */
+static const int cfq_queued = 8;               /* minimum rq allocate limit per-queue*/
+static const int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 };
+static const int cfq_back_max = 16 * 1024;     /* maximum backwards seek, in KiB */
+static const int cfq_back_penalty = 2;         /* penalty of a backwards seek */
 
-static int cfq_slice_sync = HZ / 10;
+static const int cfq_slice_sync = HZ / 10;
 static int cfq_slice_async = HZ / 25;
-static int cfq_slice_async_rq = 2;
+static const int cfq_slice_async_rq = 2;
 static int cfq_slice_idle = HZ / 100;
 
 #define CFQ_IDLE_GRACE         (HZ / 10)
@@ -47,7 +45,7 @@ static int cfq_slice_idle = HZ / 100;
 /*
  * disable queueing at the driver/hardware level
  */
-static int cfq_max_depth = 2;
+static const int cfq_max_depth = 2;
 
 /*
  * for the hash of cfqq inside the cfqd
@@ -861,8 +859,8 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
         * store what was left of this slice, if the queue idled out
         * or was preempted
         */
-       if (time_after(now, cfqq->slice_end))
-               cfqq->slice_left = now - cfqq->slice_end;
+       if (time_after(cfqq->slice_end, now))
+               cfqq->slice_left = cfqq->slice_end - now;
        else
                cfqq->slice_left = 0;