linux-kernel - Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

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Date:   Wed, 12 Jun 2019 14:41:06 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Aaro Koskinen <aaro.koskinen@....fi>,
        Christian Zigotzky <chzigotzky@...osoft.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

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