Re: [PATCH] tee: add FOLL_LONGTERM for CMA case when alloc shm

[Christoph Hellwig]

> +	u32 page_flag = FOLL_WRITE;
>  
>  	if (!tee_device_get(teedev))
>  		return ERR_PTR(-EINVAL);
> @@ -255,9 +256,11 @@ register_shm_helper(struct tee_context *ctx, unsigned long addr,
>  		ret = ERR_PTR(-ENOMEM);
>  		goto err_free_shm;
>  	}
> -
> +#if IS_ENABLED(CONFIG_CMA)
> +	page_flag |= FOLL_LONGTERM;
> +#endif
>  	if (flags & TEE_SHM_USER_MAPPED)

If this mapping is long live it should always use FOLL_LONGTERM.

The ifdef does not make sense.