linux-kernel - Re: [PATCH 1/5] misc: vop: change the way of allocating vring for noncoherent platform

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Date:   Sat, 26 Sep 2020 08:50:15 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Sherry Sun <sherry.sun@....com>
Cc:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com, arnd@...db.de,
        gregkh@...uxfoundation.org, wang.yi59@....com.cn,
        huang.zijiang@....com.cn, rikard.falkeborn@...il.com,
        lee.jones@...aro.org, mst@...hat.com, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: Re: [PATCH 1/5] misc: vop: change the way of allocating vring for
 noncoherent platform

> +#include <linux/dma-noncoherent.h>

This header must not be included in drivers.

>  
> +		if (dev_is_dma_coherent(vop_dev(vdev)))

And this API must not be used in drivers either.

> +			vdev->vvr[i].vrh.vring.used =
> +				(void __force *)vpdev->hw_ops->remap(

And you must not use __force casts without a comment explanation why
they are safe.