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

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Message-ID: <2226c252d2dfa7973bcc298d5bf9521d1e3c5827.camel@kernel.crashing.org>
Date:   Tue, 11 Jun 2019 19:04:09 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Christoph Hellwig <hch@....de>
Cc:     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, 2019-06-11 at 09:54 +0200, Christoph Hellwig wrote:
> 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.

Oh I assume that's just a glitch in the patch :-)

Cheers,
Ben.