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

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Date:   Wed, 17 May 2023 00:34:57 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Xiaoming Ding <xiaoming.ding@...iatek.com>
Cc:     Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        op-tee@...ts.trustedfirmware.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, fei.xu@...iatek.com,
        srv_heupstream@...iatek.com, linux-mm@...ck.org
Subject: Re: [PATCH] tee: add FOLL_LONGTERM for CMA case when alloc shm

> +	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.