diff --git a/mm/shmem.c b/mm/shmem.c
index bdc4bbb..db2c9e8d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -180,7 +180,7 @@
 static struct inode_operations shmem_dir_inode_operations;
 static struct vm_operations_struct shmem_vm_ops;
 
-static struct backing_dev_info shmem_backing_dev_info = {
+static struct backing_dev_info shmem_backing_dev_info  __read_mostly = {
 	.ra_pages	= 0,	/* No readahead */
 	.capabilities	= BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
 	.unplug_io_fn	= default_unplug_io_fn,