disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/ttm/ttm_tt.c
..
..
@@ -466,3 +466,4 @@
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 	else
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 		ttm_pool_unpopulate(ttm);
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 }
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+EXPORT_SYMBOL(ttm_tt_unpopulate);