block: jiffies fixes

Use HZ-independent calculation of milliseconds.
Add jiffies.h where it was missing since functions or macros
from it are used.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 7f986cafacd5..1ebc1fdb9144 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -8,6 +8,7 @@
 #include <linux/blkdev.h>
 #include <linux/bootmem.h>      /* for max_pfn/max_low_pfn */
 #include <linux/gcd.h>
+#include <linux/jiffies.h>
 
 #include "blk.h"
 
@@ -144,7 +145,7 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn)
         q->nr_batching = BLK_BATCH_REQ;
 
         q->unplug_thresh = 4;           /* hmm */
-        q->unplug_delay = (3 * HZ) / 1000;      /* 3 milliseconds */
+        q->unplug_delay = msecs_to_jiffies(3);  /* 3 milliseconds */
         if (q->unplug_delay == 0)
                 q->unplug_delay = 1;