diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c
index 4caf5e3079eb4b..359577ec168019 100644
--- a/arch/powerpc/kernel/rtas_flash.c
+++ b/arch/powerpc/kernel/rtas_flash.c
@@ -709,9 +709,9 @@ static int __init rtas_flash_init(void)
 	if (!rtas_validate_flash_data.buf)
 		return -ENOMEM;
 
-	flash_block_cache = kmem_cache_create("rtas_flash_cache",
-					      RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
-					      NULL);
+	flash_block_cache = kmem_cache_create_usercopy("rtas_flash_cache",
+						       RTAS_BLK_SIZE, RTAS_BLK_SIZE,
+						       0, 0, RTAS_BLK_SIZE, NULL);
 	if (!flash_block_cache) {
 		printk(KERN_ERR "%s: failed to create block cache\n",
 				__func__);