cfq-iosched: remove cfq_io_context last_queue

It hasn't been used for a while, kill it off and remove the old
if 0 code chunk.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 2 insertions, 18 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 07b706243772..a31066d6c20c 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1471,22 +1471,8 @@ err:
 static void
 cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic)
 {
-        unsigned long elapsed, ttime;
-
-        /*
-         * if this context already has stuff queued, thinktime is from
-         * last queue not last end
-         */
-#if 0
-        if (time_after(cic->last_end_request, cic->last_queue))
-                elapsed = jiffies - cic->last_end_request;
-        else
-                elapsed = jiffies - cic->last_queue;
-#else
-                elapsed = jiffies - cic->last_end_request;
-#endif
-
-        ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle);
+        unsigned long elapsed = jiffies - cic->last_end_request;
+        unsigned long ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle);
 
         cic->ttime_samples = (7*cic->ttime_samples + 256) / 8;
         cic->ttime_total = (7*cic->ttime_total + 256*ttime) / 8;
@@ -1649,7 +1635,6 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
         cfq_update_io_seektime(cic, rq);
         cfq_update_idle_window(cfqd, cfqq, cic);
 
-        cic->last_queue = jiffies;
         cic->last_request_pos = rq->sector + rq->nr_sectors;
 
         if (cfqq == cfqd->active_queue) {
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 36a6eacefe20..83dcd8c0e974 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -82,7 +82,6 @@ struct cfq_io_context {
 
         unsigned long last_end_request;
         sector_t last_request_pos;
-        unsigned long last_queue;
 
         unsigned long ttime_total;
         unsigned long ttime_samples;