ZCRYPT_DEV_STATUS_EXT_SIZE
memset(dev_status_mem, 0, ZCRYPT_DEV_STATUS_EXT_SIZE);
dev_status_mem = kvmalloc(ZCRYPT_DEV_STATUS_EXT_SIZE, GFP_KERNEL);
memset(dev_status_mem, 0, ZCRYPT_DEV_STATUS_EXT_SIZE);
dev_status_mem = kvmalloc(ZCRYPT_DEV_STATUS_EXT_SIZE, GFP_KERNEL);