[PATCH 4/4] drm/ttm: free one in huge pool even shrink request less than one element

From: Roger He <Hongbo.He-5C7GfCeVMHo@public.gmane.org>
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: Roger He <Hongbo.He-5C7GfCeVMHo@public.gmane.org>,
	Christian.Koenig-5C7GfCeVMHo@public.gmane.org
Subject: [PATCH 4/4] drm/ttm: free one in huge pool even shrink request less than one element
Date: Wed, 22 Nov 2017 13:36:56 +0800	[thread overview]
Message-ID: <1511329016-552-4-git-send-email-Hongbo.He@amd.com> (raw)
In-Reply-To: <1511329016-552-1-git-send-email-Hongbo.He-5C7GfCeVMHo@public.gmane.org>

Change-Id: Id8bd4d1ecff9f3ab14355e2dbd1c59b9fe824e01
Signed-off-by: Roger He <Hongbo.He@amd.com>
---
 drivers/gpu/drm/ttm/ttm_page_alloc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 37c2f2f..f80fc5b 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -463,11 +463,13 @@ ttm_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
 		pool = &_manager->pools[(i + pool_offset)%NUM_POOLS];
 		/* OK to use static buffer since global mutex is held. */
 		nr_free_pool = (nr_free >> pool->order);
-		if (nr_free_pool == 0)
-			continue;
+		if (!nr_free_pool && pool->order)
+			nr_free_pool = 1;
 
 		shrink_pages = ttm_page_pool_free(pool, nr_free_pool, true);
 		freed += ((nr_free_pool - shrink_pages) << pool->order);
+		if (freed >= sc->nr_to_scan)
+			break;
 	}
 	mutex_unlock(&lock);
 	return freed;
-- 
2.7.4

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