ttm: Clear the ttm page allocated from high memory zone correctly
The TTM page can be allocated from high memory. In such case it is wrong to use the page_address(page) as the virtual address for the high memory page. bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=50241Signed-off-by: NZhao Yakui <yakui.zhao@intel.com> Cc: stable@vger.kernel.org Reviewed-by: NThomas Hellstrom <thellstrom@vmware.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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