[SCSI] zfcp: optimize zfcp_qdio_account

Remove expensive ktime_get()/ktime_us_delta() functions from the hot
path and use get_clock_monotonic() instead. This elimates seven
function calls and avoids a lot of unnecessary calculations.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index cc98eead2c3c..7da2fad8f515 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -438,7 +438,7 @@ struct zfcp_qdio {
         struct zfcp_qdio_queue  req_q;
         spinlock_t              stat_lock;
         spinlock_t              req_q_lock;
-        ktime_t                 req_q_time;
+        unsigned long long      req_q_time;
         u64                     req_q_util;
         atomic_t                req_q_full;
         wait_queue_head_t       req_q_wq;