linux-kernel - virtio gpu sparse warning

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Date:   Thu, 24 Nov 2016 04:57:11 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     Jiri Slaby <jslaby@...e.cz>,
        virtualization@...ts.linux-foundation.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org
Subject: virtio gpu sparse warning

sparse produces these warnings:

drivers/gpu/drm/virtio/virtgpu_fb.c:340:27: warning: incorrect type in
assignment (different address spaces)
drivers/gpu/drm/virtio/virtgpu_fb.c:340:27:    expected char [noderef]
<asn:2>*screen_base
drivers/gpu/drm/virtio/virtgpu_fb.c:340:27:    got void *vmap

This is because the expected type is void __iomem *, while
virtio gpu object is void *vmap.

We could just cast the warning away but I'm not sure this
is not a symptom of an actual problem. For example, might
some code call iounmap on this address?

-- 
MST