md: Replace __this_cpu_ptr with raw_cpu_ptr

__this_cpu_ptr is being phased out.
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/md/dm-stats.c

@@ -548,7 +548,7 @@ void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
 		 * A race condition can at worst result in the merged flag being
 		 * misrepresented, so we don't have to disable preemption here.
 		 */
-		last = __this_cpu_ptr(stats->last);
+		last = raw_cpu_ptr(stats->last);
 		stats_aux->merged =
 			(bi_sector == (ACCESS_ONCE(last->last_sector) &&
 				       ((bi_rw & (REQ_WRITE | REQ_DISCARD)) ==