linux-kernel - Re: use generic DMA mapping code in powerpc V4

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Message-ID: <20181214164528.GB27074@lst.de>
Date:   Fri, 14 Dec 2018 17:45:28 +0100
From:   Christoph Hellwig <hch@....de>
To:     Christian Zigotzky <chzigotzky@...osoft.de>
Cc:     Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        Darren Stevens <darren@...vens-zone.net>,
        linux-kernel@...r.kernel.org, Julian Margetson <runaway@...dw.ms>,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Paul Mackerras <paulus@...ba.org>,
        Olof Johansson <olof@...om.net>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4

On Fri, Dec 14, 2018 at 01:00:26PM +0100, Christian Zigotzky wrote:
> On 12 December 2018 at 3:15PM, Christoph Hellwig wrote:
> > Thanks for bisecting.  I've spent some time going over the conversion
> > but can't really pinpoint it.  I have three little patches that switch
> > parts of the code to the generic version.  This is on top of the
> > last good commmit (977706f9755d2d697aa6f45b4f9f0e07516efeda).
> >
> > Can you check with whіch one things stop working?
>
> Hello Christoph,
>
> Great news! All your patches work!

No so great because that means I still have no idea what broke..

> I tested all your patches (including the patch '0004-alloc-free.patch' 
> today) and the PASEMI onboard ethernet works and the P5020 board boots 
> without any problems. Thank you for your work!
> I have a few days off. That means, I will work less and only for the A-EON 
> first level Linux support. I can test again on Thursday next week.

Enjoy your days off!

I think I'll need to prepare something new that is better bisectable,
and use that opportunity to reason about the changes a little more.