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

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Message-ID: <334280df-9002-c92f-d381-9fd79e2a9036@lwfinger.net>
Date:   Thu, 13 Jun 2019 13:51:41 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Christoph Hellwig <hch@....de>, benh@...nel.crashing.org,
        paulus@...ba.org, mpe@...erman.id.au
Cc:     aaro.koskinen@....fi, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac

On 6/13/19 3:24 AM, Christoph Hellwig wrote:
> With the strict dma mask checking introduced with the switch to
> the generic DMA direct code common wifi chips on 32-bit powerbooks
> stopped working.  Add a 30-bit ZONE_DMA to the 32-bit pmac builds
> to allow them to reliably allocate dma coherent memory.
> 
> Fixes: 65a21b71f948 ("powerpc/dma: remove dma_nommu_dma_supported")
> Reported-by: Aaro Koskinen <aaro.koskinen@....fi>
> Signed-off-by: Christoph Hellwig <hch@....de>

As expected, it works. The patch needs
Cc: Stable <stable*vger.kernel.org> # v5.1+

Tested-by: Larry Finger <Larry.Finger@...inger.net>
Acked-by: Larry Finger <Larry.Finger@...inger.net>

Thanks for the help, and the patience with my debugging problems with u64 variables.

Larry