linux-kernel - Re: [PATCH v2 03/11] drm/shmem: drop VM

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Date:   Mon, 23 Sep 2019 14:32:32 +0100
From:   Steven Price <steven.price@....com>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Sean Paul <sean@...rly.run>
Subject: Re: [PATCH v2 03/11] drm/shmem: drop VM_DONTDUMP

On 17/09/2019 10:23, Gerd Hoffmann wrote:
> Not obvious why this is needed.  According to Deniel Vetter this is most
> likely a historic artefact dating back to the days where drm drivers
> exposed hardware registers as mmap'able gem objects, to avoid dumping
> touching those registers.  shmem gem objects surely don't need that ...
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index a9a586630517..6efedab15016 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -536,7 +536,7 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
>  		return ret;
>  	}
>  
> -	vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
> +	vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND;
>  	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
>  	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
>  	vma->vm_ops = &drm_gem_shmem_vm_ops;
>