linux-kernel - Re: [PATCH 2/8] drm/shmem: switch shmem helper to &drm_gem_object

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Date:   Tue, 17 Sep 2019 10:14:48 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Steven Price <steven.price@....com>
Cc:     dri-devel@...ts.freedesktop.org,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        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>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        Sean Paul <sean@...rly.run>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Subject: Re: [PATCH 2/8] drm/shmem: switch shmem helper to
 &drm_gem_object_funcs.mmap

  Hi,

> > -	/* VM_PFNMAP was set by drm_gem_mmap() */
> > -	vma->vm_flags &= ~VM_PFNMAP;
> > -	vma->vm_flags |= VM_MIXEDMAP;
> > +	vma->vm_flags |= (VM_MIXEDMAP|VM_DONTEXPAND);
> 
> I'm finding this a bit hard to follow - but I think here we've lost
> VM_IO and VM_DONTDUMP which used to be set by drm_gem_mmap().

Yep.  Intentional, but I think I better split that off to a separate
patch with a commit message explaining things.

> Also it looks like nothing is fiddling vma->vm_page_prot anymore.

Oops, that one was not intentional.  Will fix.

cheers,
  Gerd