[PATCH v2] drm/gem: Fix mmap fake offset handling for drm_gem_object_funcs.mmap

[Gerd Hoffmann]

  Hi,

> > I can see now why you want a private address space for each object.
> > Does that imply we need an anon_inode for each gem object?  Or is
> > there some more lightweight way to do this?
> 
> I have no idea whether we can get a address_space struct without an inode
> (and no disasters).

Anything building on shmem helpers should be able to use
obj->filp->f_mapping, right?  So allocating an inode unconditionally
doesn't look like a good plan.

Guess I'll go look at ttm-local changes for starters and see how it
goes.

cheers,
  Gerd