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SubjectRe: linux-next: build failure after merge of the iommu tree
Hi all,

On Mon, 21 Sep 2020 14:09:01 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> After merging the iommu tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
>
> drivers/gpu/drm/msm/msm_iommu.c: In function 'msm_iommu_pagetable_unmap':
> drivers/gpu/drm/msm/msm_iommu.c:46:2: error: implicit declaration of function 'iommu_flush_tlb_all'; did you mean 'iommu_flush_iotlb_all'? [-Werror=implicit-function-declaration]
> 46 | iommu_flush_tlb_all(to_msm_iommu(pagetable->parent)->domain);
> | ^~~~~~~~~~~~~~~~~~~
> | iommu_flush_iotlb_all
>
> Caused by commit
>
> aae4c8e27bd7 ("iommu: Rename iommu_tlb_* functions to iommu_iotlb_*")
>
> interacting with commit
>
> b145c6e65eb0 ("drm/msm: Add support to create a local pagetable")
>
> from the drm-msm tree.
>
> I have applied the following merge fix patch. Someone will need to tell
> Linus about this fix up when the trees get merged.
>
> From: Stephen Rothwell <sfr@canb.auug.org.au>
> Date: Mon, 21 Sep 2020 14:04:14 +1000
> Subject: [PATCH] merge fix upt for iommu_flush_iotlb_all() rename
>
> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
> ---
> drivers/gpu/drm/msm/msm_iommu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
> index 3a83ffdb3b90..22ac7c692a81 100644
> --- a/drivers/gpu/drm/msm/msm_iommu.c
> +++ b/drivers/gpu/drm/msm/msm_iommu.c
> @@ -43,7 +43,7 @@ static int msm_iommu_pagetable_unmap(struct msm_mmu *mmu, u64 iova,
> size -= 4096;
> }
>
> - iommu_flush_tlb_all(to_msm_iommu(pagetable->parent)->domain);
> + iommu_flush_iotlb_all(to_msm_iommu(pagetable->parent)->domain);
>
> return (unmapped == size) ? 0 : -EINVAL;
> }
> @@ -199,7 +199,7 @@ struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
>
> /*
> * TODO we would like each set of page tables to have a unique ASID
> - * to optimize TLB invalidation. But iommu_flush_tlb_all() will
> + * to optimize TLB invalidation. But iommu_flush_iotlb_all() will
> * end up flushing the ASID used for TTBR1 pagetables, which is not
> * what we want. So for now just use the same ASID as TTBR1.
> */
> --
> 2.28.0

This merge fix up is now needed when the iommu tree and the drm tree are merged.
--
Cheers,
Stephen Rothwell
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