linux-kernel - Re: [PATCH v1 25/36] drm/i915/gem: drop nth

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Message-ID: <f5d12153-f14c-427e-8294-8b8b44485895@lucifer.local>
Date: Thu, 28 Aug 2025 18:55:56 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
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        Alexander Potapenko <glider@...gle.com>,
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        Christoph Lameter <cl@...two.org>, Dennis Zhou <dennis@...nel.org>,
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Subject: Re: [PATCH v1 25/36] drm/i915/gem: drop nth_page() usage within SG
 entry

On Thu, Aug 28, 2025 at 12:01:29AM +0200, David Hildenbrand wrote:
> It's no longer required to use nth_page() when iterating pages within a
> single SG entry, so let's drop the nth_page() usage.
>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
> Cc: Tvrtko Ursulin <tursulin@...ulin.net>
> Cc: David Airlie <airlied@...il.com>
> Cc: Simona Vetter <simona@...ll.ch>
> Signed-off-by: David Hildenbrand <david@...hat.com>

LGTM, so:

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

> ---
>  drivers/gpu/drm/i915/gem/i915_gem_pages.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> index c16a57160b262..031d7acc16142 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> @@ -779,7 +779,7 @@ __i915_gem_object_get_page(struct drm_i915_gem_object *obj, pgoff_t n)
>  	GEM_BUG_ON(!i915_gem_object_has_struct_page(obj));
>
>  	sg = i915_gem_object_get_sg(obj, n, &offset);
> -	return nth_page(sg_page(sg), offset);
> +	return sg_page(sg) + offset;
>  }
>
>  /* Like i915_gem_object_get_page(), but mark the returned page dirty */
> --
> 2.50.1
>