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

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Message-ID: <20190611075439.GB21815@lst.de>
Date:   Tue, 11 Jun 2019 09:54:39 +0200
From:   Christoph Hellwig <hch@....de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Christoph Hellwig <hch@....de>,
        Larry Finger <Larry.Finger@...inger.net>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Christian Zigotzky <chzigotzky@...osoft.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

On Tue, Jun 11, 2019 at 04:59:54PM +1000, Benjamin Herrenschmidt wrote:
> Ah stupid me ... it's dma_set_mask that failed, since it has no idea
> that the calling driver is limited to lowmem.
> 
> That's also why the "wrong" patch worked.
> 
> So yes, a ZONE_DMA at 30-bits will work, though it's somewhat overkill.

Well, according to Larry it doesn't actually work, which is odd.