linux-kernel - Re: [PATCH] powerpc: enable a 30-bit ZONE

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Message-ID: <87k1dgcqov.fsf@concordia.ellerman.id.au>
Date:   Thu, 20 Jun 2019 23:49:20 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christoph Hellwig <hch@....de>, paulus@...ba.org
Cc:     Larry.Finger@...inger.net, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, aaro.koskinen@....fi
Subject: Re: [PATCH] powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac

Benjamin Herrenschmidt <benh@...nel.crashing.org> writes:
> On Wed, 2019-06-19 at 22:32 +1000, Michael Ellerman wrote:
>> Christoph Hellwig <hch@....de> writes:
>> > Any chance this could get picked up to fix the regression?
>> 
>> Was hoping Ben would Ack it. He's still powermac maintainer :)
>> 
>> I guess he OK'ed it in the other thread, will add it to my queue.
>
> Yeah ack. If I had written it myself, I would have made the DMA bits a
> variable and only set it down to 30 if I see that device in the DT
> early on, but I can't be bothered now, if it works, ship it :-)

OK, we can do that next release if someone's motivated.

> Note: The patch affects all ppc32, though I don't think it will cause
> any significant issue on those who don't need it.

Yeah. We could always hide it behind CONFIG_PPC_PMAC if it becomes a problem.

cheers