drbd: use get_random_u64() where appropriate

Use the typed random integer helpers instead of
get_random_bytes() when filling a single integer variable.
The helpers return the value directly, require no pointer
or size argument, and better express intent.

Signed-off-by: David Carlier <devnexen@gmail.com>
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://patch.msgid.link/20260405154704.4610-1-devnexen@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: devnexen

drivers/block/drbd/drbd_main.c

@@ -874,7 +874,7 @@ void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *peer_device)
 	if (uuid && uuid != UUID_JUST_CREATED)
 		uuid = uuid + UUID_NEW_BM_OFFSET;
 	else
-		get_random_bytes(&uuid, sizeof(u64));
+		uuid = get_random_u64();
 	drbd_uuid_set(device, UI_BITMAP, uuid);
 	drbd_print_uuids(device, "updated sync UUID");
 	drbd_md_sync(device);
@@ -3337,7 +3337,7 @@ void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local)
 	u64 val;
 	unsigned long long bm_uuid;
 
-	get_random_bytes(&val, sizeof(u64));
+	val = get_random_u64();
 
 	spin_lock_irq(&device->ldev->md.uuid_lock);
 	bm_uuid = device->ldev->md.uuid[UI_BITMAP];

drivers/block/drbd/drbd_nl.c

@@ -3236,7 +3236,7 @@ int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
 			 * matching real data uuid exists).
 			 */
 			u64 val;
-			get_random_bytes(&val, sizeof(u64));
+			val = get_random_u64();
 			drbd_set_ed_uuid(device, val);
 			drbd_warn(device, "Resumed without access to data; please tear down before attempting to re-configure.\n");
 		}