[PATCH v4 15/40] scsi: core: optimize scsi_evt_emit() by using an atomic iterator

[Yury Norov <yury.norov@gmail.com>]

A plain loop in scsi_evt_thread() opencodes optimized atomic bit traversing
macro. Simplify it by using the dedicated iterator.

CC: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 drivers/scsi/scsi_lib.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ec39acc986d6..72bebe5247e7 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -13,6 +13,7 @@
 #include <linux/bitops.h>
 #include <linux/blkdev.h>
 #include <linux/completion.h>
+#include <linux/find_atomic.h>
 #include <linux/kernel.h>
 #include <linux/export.h>
 #include <linux/init.h>
@@ -2588,14 +2589,13 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt)
 void scsi_evt_thread(struct work_struct *work)
 {
 	struct scsi_device *sdev;
-	enum scsi_device_event evt_type;
+	enum scsi_device_event evt_type = SDEV_EVT_FIRST;
 	LIST_HEAD(event_list);
 
 	sdev = container_of(work, struct scsi_device, event_work);
 
-	for (evt_type = SDEV_EVT_FIRST; evt_type <= SDEV_EVT_LAST; evt_type++)
-		if (test_and_clear_bit(evt_type, sdev->pending_events))
-			sdev_evt_send_simple(sdev, evt_type, GFP_KERNEL);
+	for_each_test_and_clear_bit_from(evt_type, sdev->pending_events, SDEV_EVT_LAST + 1)
+		sdev_evt_send_simple(sdev, evt_type, GFP_KERNEL);
 
 	while (1) {
 		struct scsi_event *evt;
-- 
2.43.0