linux-kernel - Re: [PATCH v18 05/26] drm/shmem-helper: Remove obsoleted is

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Message-ID: <20231110110827.403bdbeb@collabora.com>
Date:   Fri, 10 Nov 2023 11:08:27 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     David Airlie <airlied@...il.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Christian König <christian.koenig@....com>,
        Qiang Yu <yuq825@...il.com>,
        Steven Price <steven.price@....com>,
        Emma Anholt <emma@...olt.net>, Melissa Wen <mwen@...lia.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v18 05/26] drm/shmem-helper: Remove obsoleted is_iomem
 test

On Mon, 30 Oct 2023 02:01:44 +0300
Dmitry Osipenko <dmitry.osipenko@...labora.com> wrote:

> Everything that uses the mapped buffer should be agnostic to is_iomem.
> The only reason for the is_iomem test is that we're setting shmem->vaddr
> to the returned map->vaddr. Now that the shmem->vaddr code is gone, remove
> the obsoleted is_iomem test to clean up the code.
> 
> Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 154585ddae08..2cc0601865f6 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -315,12 +315,6 @@ int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem,
>  
>  	if (obj->import_attach) {
>  		ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
> -		if (!ret) {
> -			if (drm_WARN_ON(obj->dev, map->is_iomem)) {
> -				dma_buf_vunmap(obj->import_attach->dmabuf, map);
> -				return -EIO;
> -			}
> -		}
>  	} else {
>  		pgprot_t prot = PAGE_KERNEL;
>