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Subject: Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook
To: Christoph Hellwig <hch@lst.de>
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From: Larry Finger <Larry.Finger@lwfinger.net>
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Date: Wed, 12 Jun 2019 14:41:06 -0500
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Cc: Aaro Koskinen <aaro.koskinen@iki.fi>, linux-wireless@vger.kernel.org,
 linux-kernel@vger.kernel.org, Christian Zigotzky <chzigotzky@xenosoft.de>,
 linuxppc-dev@lists.ozlabs.org
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

On 6/12/19 1:55 AM, Christoph Hellwig wrote:
> 
> Ooops, yes.  But I think we could just enable ZONE_DMA on 32-bit
> powerpc.  Crude enablement hack below:
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 8c1c636308c8..1dd71a98b70c 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -372,7 +372,7 @@ config PPC_ADV_DEBUG_DAC_RANGE
>   
>   config ZONE_DMA
>   	bool
> -	default y if PPC_BOOK3E_64
> +	default y
>   
>   config PGTABLE_LEVELS
>   	int
> 

With the patch for Kconfig above, and the original patch setting 
ARCH_ZONE_DMA_BITS to 30, everything works.

Do you have any ideas on what should trigger the change in ARCH_ZONE_BITS? 
Should it be CONFIG_PPC32 defined, or perhaps CONFIG_G4_CPU defined?

Larry