[PATCH 1/3] drm: add func to get max iomem address v2

[Daniel Vetter]

On Fri, Feb 16, 2018 at 02:40:11PM +0000, Chris Wilson wrote:
> Quoting Chunming Zhou (2018-02-09 02:44:08)
> > it will be used to check if the driver needs swiotlb
> > v2: Don't use inline, instead, move function to drm_memory.c (Mechel Daenzer <michel at daenzer.net>)
> > 
> > Change-Id: Idbe47af8f12032d4803bb3d47273e807f19169c3
> > Signed-off-by: Chunming Zhou <david1.zhou at amd.com>
> > Reviewed-by: Monk Liu <monk.liu at amd.com>
> > Reviewed-by: Christian König <christian.koenig at amd.com>
> > ---
> >  drivers/gpu/drm/drm_memory.c | 13 +++++++++++++
> >  include/drm/drm_cache.h      |  2 ++
> >  2 files changed, 15 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c
> > index fc0ebd273ef8..7ca500b8c399 100644
> > --- a/drivers/gpu/drm/drm_memory.c
> > +++ b/drivers/gpu/drm/drm_memory.c
> > @@ -149,3 +149,16 @@ void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
> >                 iounmap(map->handle);
> >  }
> >  EXPORT_SYMBOL(drm_legacy_ioremapfree);
> > +
> > +u64 drm_get_max_iomem(void)
> > +{
> > +       struct resource *tmp;
> > +       u64 max_iomem = 0;
> > +
> > +       for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
> > +               max_iomem = max(max_iomem,  tmp->end);
> 
> Note that resource.end is of type resource_size_t which is not u64 on
> 32b.
> 
> Either use max_t(u64) or resource_size_t max_iomem with the implicit
> cast on the return.

Yeah linux-next spotted that one too, pls fix in a follow-up with the
other things I've raised (lack of kerneldoc mostly).
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch