linux-kernel - Re: linux-next: manual merge of the iommu tree with the drm-misc tree

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Date:   Wed, 21 Aug 2019 08:33:36 +0100
From:   Will Deacon <will@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Joerg Roedel <joro@...tes.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: linux-next: manual merge of the iommu tree with the drm-misc tree

On Wed, Aug 21, 2019 at 02:16:40PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the iommu tree got a conflict in:
> 
>   drivers/gpu/drm/panfrost/panfrost_mmu.c
> 
> between commit:
> 
>   187d2929206e ("drm/panfrost: Add support for GPU heap allocations")
> 
> from the drm-misc tree and commit:
> 
>   a2d3a382d6c6 ("iommu/io-pgtable: Pass struct iommu_iotlb_gather to ->unmap()")
> 
> from the iommu tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.

Thanks. I don't think the conflict is as bad as it looks, there's just
clearly been a lot of changes to this file. The IOMMU changes are all
around the io-pgtable API, so there's an extra 'NULL' argument to
->unmap() and some new TLB invalidation functions in the renamed
'iommu_gather_ops' (now 'iommu_flush_ops').

Will