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From: David Stevens <stevensd@chromium.org>
To: Christian Koenig <christian.koenig@amd.com>,
Cc: David Stevens <stevensd@chromium.org>
Subject: [PATCH] drm/ttm: use compound pages for THP
Date: Wed, 13 Jan 2021 17:47:33 +0900
Message-ID: <20210113084733.1181460-1-stevensd@chromium.org> (raw)

Compound page metadata is necessary for page reference counting to work
properly on pages besides the head page. Without it, put_page
corresponding to the last outstanding get_page call on a tail page will
end up freeing that page, even if the bo still references the page.

Signed-off-by: David Stevens <stevensd@chromium.org>
 drivers/gpu/drm/ttm/ttm_pool.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 7b2f60616750..09239b93dc2c 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -83,7 +83,6 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
 		gfp_flags &= ~__GFP_MOVABLE;
-		gfp_flags &= ~__GFP_COMP;
 	if (!pool->use_dma_alloc) {

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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-13  8:47 David Stevens [this message]
2021-01-13  8:58 ` Christian König
2021-01-13  9:33   ` David Stevens
2021-01-13 12:44     ` Christian König

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