Re: [Intel-gfx] [PATCH] drm/i915: Skip remap_io_mapping() for non-x86 platforms

[Jani Nikula <jani.nikula@intel.com>]

On Fri, 12 Nov 2021, Mullati Siva <siva.mullati@intel.com> wrote:
> The _PAGE_CACHE_MASK macro is not defined in non-x86
> architectures and it's been used in remap_io_mapping().
> Only hw that supports mappable aperture would hit this path
> remap_io_mapping(), So skip this code for non-x86 architectures.

Patch changelog goes here.

> Signed-off-by: Mullati Siva <siva.mullati@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_mm.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c
> index 666808cb3a32..d76feeaf3fd1 100644
> --- a/drivers/gpu/drm/i915/i915_mm.c
> +++ b/drivers/gpu/drm/i915/i915_mm.c
> @@ -91,6 +91,7 @@ int remap_io_mapping(struct vm_area_struct *vma,
>  		     unsigned long addr, unsigned long pfn, unsigned long size,
>  		     struct io_mapping *iomap)
>  {
> +#if IS_ENABLED(CONFIG_X86)

My feedback to the previous version was:

Please don't add conditional compilation within functions.

I mean it.

>  	struct remap_pfn r;
>  	int err;
>  
> @@ -108,6 +109,7 @@ int remap_io_mapping(struct vm_area_struct *vma,
>  		zap_vma_ptes(vma, addr, (r.pfn - pfn) << PAGE_SHIFT);
>  		return err;
>  	}
> +#endif
>  
>  	return 0;
>  }

-- 
Jani Nikula, Intel Open Source Graphics Center