From: Monk Liu <Monk.Liu@amd.com>
Date: Fri, 1 Dec 2017 18:21:34 +0800
Subject: drm/ttm: fix incorrect calculate on shrink_pages
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Git-commit: a782fc8cc6bf6909daf3b65630079e2afec316ef
Patch-mainline: v4.15-rc5
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

shrink_pages is in unit of Order after ttm_page_pool_free,
but it is used by nr_free in next round so need change
it into native page unit

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/ttm/ttm_page_alloc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -455,6 +455,7 @@ ttm_pool_shrink_scan(struct shrinker *sh
 		freed += (nr_free_pool - shrink_pages) << pool->order;
 		if (freed >= sc->nr_to_scan)
 			break;
+		shrink_pages <<= pool->order;
 	}
 	mutex_unlock(&lock);
 	return freed;