drm/i915: Don't clobber the GTT when it's within stolen memory
On most gen2-4 platforms the GTT can be (or maybe always is?) inside the stolen memory region. If that's the case, reduce the size of the stolen memory appropriately to make make sure we don't clobber the GTT. v2: Deal with gen4 36 bit physical address Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80151Acked-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: stable@vger.kernel.org Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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