drm/i915: check that the i965g/gm 4G limit is really obeyed
drm/i915: check that the i965g/gm 4G limit is really obeyed

In truly crazy circumstances shmem might give us the wrong type of
page. So be a bit paranoid and double check this.

Reviewer: Damien Lespiau <64bd3cb94f359c1a3ce68dae5e26b40578526277@intel.com>
Cc: Rob Clark <915c10c999604870200b6defbe633d857c856ca0@gmail.com>
References: http://lkml.org/lkml/2011/7/11/238
Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>
Signed-off-by: Rodrigo Vivi <f714145d6ee82178e54021e0c168f56d17b53c9c@gmail.com>
Reviewed-by: Damien Lespiau <64bd3cb94f359c1a3ce68dae5e26b40578526277@intel.com>
Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs