linux-kernel - Re: [BUG] dma-mapping: remove CONFIG_DMA

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Message-ID: <9de341bc-fe8d-1820-187a-46455e4b9bf2@compro.net>
Date:   Tue, 21 Jun 2022 10:06:59 -0400
From:   Mark Hounschell <markh@...pro.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Robin Murphy <robin.murphy@....com>,
        Linux-kernel <linux-kernel@...r.kernel.org>,
        dmaengine@...r.kernel.org
Subject: Re: [BUG] dma-mapping: remove CONFIG_DMA_REMAP

On 6/21/22 09:48, Christoph Hellwig wrote:
> On Tue, Jun 21, 2022 at 09:43:18AM -0400, Mark Hounschell wrote:
>> Revert that commit and all works like normal. This commit breaks user land.
> 
> No.  We had that discussion before.  It exposeѕ how broken your out of
> tree driver is, which you don't bother to fix despite Robin even taking
> the pains to explain you how.

No, this is not the original issue and we never actually had a 
discussion. That original issue was about using Set/ClearPageReserved. 
You nor Robin even tried to explain why it was wrong to use it. It was 
never an issue in previous kernels. Why now? In any case I have removed 
that code. This is what happens now.

What is it you think I am doing wrong. Except for using 
Set/ClearPageReserved you have not explained anything to me.

Mark