drbd: replace kmap() with kmap_local_page() in receiver path

Use kmap_local_page() instead of kmap() to avoid
CPU contention.

kmap() uses a global set of mapping slots that can cause contention
between multiple CPUs, while kmap_local_page() uses per-CPU slots
eliminating this contention. It also ensures non-sleeping operation
and provides better cache locality.

Convert kmap() to kmap_local_page() as it aligns with ongoing
kernel efforts to modernize kmap() usage for better multi-core
scalability.

Signed-off-by: Shi Hao <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/block/drbd/drbd_receiver.c

···
 	page = peer_req->pages;
 	page_chain_for_each(page) {
 		unsigned len = min_t(int, ds, PAGE_SIZE);
-		data = kmap(page);
+		data = kmap_local_page(page);
 		err = drbd_recv_all_warn(peer_device->connection, data, len);
 		if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) {
 			drbd_err(device, "Fault injection: Corrupting data on receive\n");
 			data[0] = data[0] ^ (unsigned long)-1;
 		}
-		kunmap(page);
+		kunmap_local(data);
 		if (err) {
 			drbd_free_peer_req(device, peer_req);
 			return NULL;
···
 
 	page = drbd_alloc_pages(peer_device, 1, 1);
 
-	data = kmap(page);
+	data = kmap_local_page(page);
 	while (data_size) {
 		unsigned int len = min_t(int, data_size, PAGE_SIZE);
 
···
 			break;
 		data_size -= len;
 	}
-	kunmap(page);
+	kunmap_local(data);
 	drbd_free_pages(peer_device->device, page);
 	return err;
 }