linux-kernel - Re: linux-next: build failure after merge of the drm-intel-fixes tree

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Message-ID: <20170102214857.6ad8f2eb@t450s.home>
Date:   Mon, 2 Jan 2017 21:48:57 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jike Song <jike.song@...el.com>
Subject: Re: linux-next: build failure after merge of the drm-intel-fixes
 tree

On Tue, 3 Jan 2017 10:59:29 +0800
Zhenyu Wang <zhenyuw@...ux.intel.com> wrote:

> On 2017.01.03 10:42:39 +1100, Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the drm-intel-fixes tree, today's linux-next build (x86_64
> > allmodconfig) failed like this:
> > 
> > drivers/gpu/drm/i915/gvt/kvmgt.c: In function 'intel_vgpu_open':
> > drivers/gpu/drm/i915/gvt/kvmgt.c:511:32: error: dereferencing pointer to incomplete type 'struct mdev_device'
> >   vfio_unregister_notifier(&mdev->dev, VFIO_GROUP_NOTIFY,
> >                                 ^   
> > 
> > Caused by commit
> > 
> >   99e3123e3d72 ("vfio-mdev: Make mdev_device private and abstract interfaces")
> > 
> > from the vfio-fixes tree interacting with commit
> > 
> >   364fb6b789ff ("drm/i915/gvt/kvmgt: prevent double-release of vgpu")
> > 
> > from the drm-intel-fixes tree.  
> 
> Alex, I liked to have kvmgt related mdev interface change be merged through
> vfio tree, but wasn't awared one of Jike's fix had conflict. Could you apply
> below fix in your tree? I think in general for possible interface change in
> future we still need a pull request for i915 to resolve dependence earlier.

Hi Zhenyu,

Hopefully this abstraction will help to isolate vendor drivers from
mdev API changes in the future.  I can certainly roll this patch into
the original to maintain bisectability.  I want to get these changes in
for rc3, will a pull request for the i915 changes be sent this week?
Thanks for spotting and fixing this, Stephen.  Thanks,

Alex

> > I applied this merge fix patch:
> > 
> > From: Stephen Rothwell <sfr@...b.auug.org.au>
> > Date: Tue, 3 Jan 2017 10:38:48 +1100
> > Subject: [PATCH] vfio-mdev: fixup for "Make mdev_device private and abstract interfaces"
> > 
> > Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > ---
> >  drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> > index c24b665e007b..faaae07ae487 100644
> > --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> > +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> > @@ -508,7 +508,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
> >  	return ret;
> >  
> >  undo_group:
> > -	vfio_unregister_notifier(&mdev->dev, VFIO_GROUP_NOTIFY,
> > +	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
> >  					&vgpu->vdev.group_notifier);
> >  
> >  undo_iommu:
> > -- 
> > 2.10.2
> > 
> > -- 
> > Cheers,
> > Stephen Rothwell  
>