drbd: Make use of PFN_UP helper macro

it's a refactor to make use of PFN_UP helper macro

Signed-off-by: Cai Huoqing <[e-mail]>
Reviewed-by: Christoph Böhmwalder <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jens Axboe <[e-mail]>

drivers/block/drbd/drbd_bitmap.c

···
 		}
 	}
 
-	want = ALIGN(words*sizeof(long), PAGE_SIZE) >> PAGE_SHIFT;
+	want = PFN_UP(words*sizeof(long));
 	have = b->bm_number_of_pages;
 	if (want == have) {
 		D_ASSERT(device, b->bm_pages != NULL);

drivers/block/drbd/drbd_receiver.c

···
 	struct drbd_device *device = peer_device->device;
 	struct drbd_peer_request *peer_req;
 	struct page *page = NULL;
-	unsigned nr_pages = (payload_size + PAGE_SIZE -1) >> PAGE_SHIFT;
+	unsigned nr_pages = PFN_UP(payload_size);
 
 	if (drbd_insert_fault(device, DRBD_FAULT_AL_EE))
 		return NULL;
···
 	sector_t sector = peer_req->i.sector;
 	unsigned data_size = peer_req->i.size;
 	unsigned n_bios = 0;
-	unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT;
+	unsigned nr_pages = PFN_UP(data_size);
 
 	/* TRIM/DISCARD: for now, always use the helper function
 	 * blkdev_issue_zeroout(..., discard=true).

drivers/block/drbd/drbd_worker.c

···
 {
 	if (drbd_peer_req_has_active_page(peer_req)) {
 		/* This might happen if sendpage() has not finished */
-		int i = (peer_req->i.size + PAGE_SIZE -1) >> PAGE_SHIFT;
+		int i = PFN_UP(peer_req->i.size);
 		atomic_add(i, &device->pp_in_use_by_net);
 		atomic_sub(i, &device->pp_in_use);
 		spin_lock_irq(&device->resource->req_lock);