linux-kernel - Re: [PATCH v2 5/6] virtio-gpu: add basic prime support

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Message-ID: <1442935469.13084.36.camel@redhat.com>
Date:	Tue, 22 Sep 2015 17:24:29 +0200
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	dri-devel <dri-devel@...ts.freedesktop.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:VIRTIO GPU DRIVER" <dri-devel@...ts.freedesktop.org>,
	"open list:VIRTIO GPU DRIVER" 
	<virtualization@...ts.linux-foundation.org>,
	Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH v2 5/6] virtio-gpu: add basic prime support

> > +int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,
> > +		       struct vm_area_struct *area)
> > +{
> > +	WARN_ONCE(1, "not implemented");
> > +	return ENOSYS;
> 
> This can get called by userspace, so please don't WARN here. Also missing
> negate sign:
> 
> 	return -ENOSYS;

Hmm now checkpatch throws a warning at me:

<quote>
   WARNING: ENOSYS means 'invalid syscall nr' and nothing else
   #12: FILE: drivers/gpu/drm/virtio/virtgpu_prime.c:70:
   +       return -ENOSYS;
</quote>

I guess I should use something else then (here and elsewhere in the
file)?  Maybe -EINVAL?  Other suggestions?

thanks,
  Gerd


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