sparc64: Add 64K page size support

This patch depends on:
[v6] sparc64: Multi-page size support

- Testing

Tested on Sonoma by running stream benchmark instance which allocated
48G worth of 64K pages.

boot params: default_hugepagesz=64K hugepagesz=64K hugepages=1310720

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/mm/init_64.c

@@ -345,6 +345,10 @@ static int __init setup_hugepagesz(char *string)
 		hv_pgsz_mask = HV_PGSZ_MASK_4MB;
 		hv_pgsz_idx = HV_PGSZ_IDX_4MB;
 		break;
+	case HPAGE_64K_SHIFT:
+		hv_pgsz_mask = HV_PGSZ_MASK_64K;
+		hv_pgsz_idx = HV_PGSZ_IDX_64K;
+		break;
 	default:
 		hv_pgsz_mask = 0;
 	}