[PATCH v3 0/3] Remove split on unmap behavior

[Will Deacon]

On Wed, Nov 06, 2024 at 12:15:20PM -0400, Jason Gunthorpe wrote:
> On Wed, Nov 06, 2024 at 03:53:23PM +0000, Will Deacon wrote:
> > On Tue, 05 Nov 2024 14:14:23 -0400, Jason Gunthorpe wrote:
> > > This is the result of the discussion on removing split. We agreed that
> > > split is not required, and no application should ask for anything that
> > > would not unmap a full large IOPTE.
> > > 
> > > Instead of split the two ARM drivers will now WARN_ON and return 0. This
> > > is in contrast to what several other drivers do of removing the whole
> > > IOPTE and returning 0.
> > > 
> > > [...]
> > 
> > Applied to iommu (arm/smmu), thanks!
> > 
> > [1/3] iommu/io-pgtable-arm: Remove split on unmap behavior
> >       https://git.kernel.org/iommu/c/33729a5fc0ca
> > [2/3] iommu/io-pgtable-arm-v7s: Remove split on unmap behavior
> >       https://git.kernel.org/iommu/c/fd50651636fb
> > [3/3] iommu: Add a kdoc to iommu_unmap()
> >       https://git.kernel.org/iommu/c/6ac7dffe7cca
> 
> Thanks, can you add this hunk to fix the W=1 warning?
> 
> --- a/drivers/iommu/io-pgtable-arm-v7s.c
> +++ b/drivers/iommu/io-pgtable-arm-v7s.c
> @@ -820,7 +820,7 @@ static int __init arm_v7s_do_selftests(void)
>                 .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
>         };
>         unsigned int iova, size;
> -       unsigned int i, loopnr = 0;
> +       unsigned int i;
>         size_t mapped;
>  
>         selftest_running = true;
> @@ -868,7 +868,6 @@ static int __init arm_v7s_do_selftests(void)
>                         return __FAIL(ops);
>  
>                 iova += SZ_16M;
> -               loopnr++;
>         }
>  
>         /* Full unmap */

I think I'd already folded that in, but please check!

Will