linux-kernel - [PATCH 4.19 32/84] drm/ttm: fix start page for huge page check in ttm_put

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Message-Id: <20200116231717.499584577@linuxfoundation.org>
Date:   Fri, 17 Jan 2020 00:18:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian König <christian.koenig@....com>,
        Michel Dänzer <michel.daenzer@....com>,
        Junwei Zhang <Jerry.Zhang@....com>,
        Huang Rui <ray.huang@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Zubin Mithra <zsm@...omium.org>
Subject: [PATCH 4.19 32/84] drm/ttm: fix start page for huge page check in ttm_put_pages()

From: Christian König <christian.koenig@....com>

commit ac1e516d5a4c56bf0cb4a3dfc0672f689131cfd4 upstream.

The first page entry is always the same with itself.

Signed-off-by: Christian König <christian.koenig@....com>
Reviewed-by: Michel Dänzer <michel.daenzer@....com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@....com>
Reviewed-by: Huang Rui <ray.huang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: Zubin Mithra <zsm@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/ttm/ttm_page_alloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -732,7 +732,7 @@ static void ttm_put_pages(struct page **
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 			if (!(flags & TTM_PAGE_FLAG_DMA32) &&
 			    (npages - i) >= HPAGE_PMD_NR) {
-				for (j = 0; j < HPAGE_PMD_NR; ++j)
+				for (j = 1; j < HPAGE_PMD_NR; ++j)
 					if (p++ != pages[i + j])
 					    break;
 
@@ -767,7 +767,7 @@ static void ttm_put_pages(struct page **
 			if (!p)
 				break;
 
-			for (j = 0; j < HPAGE_PMD_NR; ++j)
+			for (j = 1; j < HPAGE_PMD_NR; ++j)
 				if (p++ != pages[i + j])
 				    break;