[PATCH] drm/amdgpu: fix 64bit division

[Christian König]

From: Christian König <christian.koenig at amd.com>

Added with "handle CPU access for split VRAM buffers".

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 10b793a..c91f13b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -551,9 +551,9 @@ static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
 {
 	struct drm_mm_node *mm = bo->mem.mm_node;
 	uint64_t size = mm->size;
+	unsigned long offset = page_offset;
 
-	mm += page_offset / size;
-	page_offset %= size;
+	page_offset = do_div(offset, size);
 	return (bo->mem.bus.base >> PAGE_SHIFT) + mm->start + page_offset;
 }
 
-- 
2.5.0