drm/radeon: Fix size overflow
ttm->num_pages is uint32. Hit overflow when << PAGE_SHIFT directly Fixes: 230c079f ("drm/ttm: make num_pages uint32_t") Signed-off-by: xinhui pan <xinhui.pan@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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