Patchwork [3.5.y.z,extended,stable] Patch "ttm: Clear the ttm page allocated from high memory zone" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Dec. 7, 2012, 4:05 p.m.
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Download mbox | patch
Permalink /patch/204559/
State New
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Herton Ronaldo Krzesinski - Dec. 7, 2012, 4:05 p.m.
This is a note to let you know that I have just added a patch titled

    ttm: Clear the ttm page allocated from high memory zone

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From b47a1b49394d479364b92592fb4f7e77155ee64d Mon Sep 17 00:00:00 2001
From: Zhao Yakui <>
Date: Tue, 13 Nov 2012 18:31:55 +0000
Subject: [PATCH] ttm: Clear the ttm page allocated from high memory zone

commit ac207ed2471150e06af0afc76e4becc701fa2733 upstream.

The TTM page can be allocated from high memory. In such case it is
wrong to use the page_address(page) as the virtual address for the high memory


Signed-off-by: Zhao Yakui <>
Reviewed-by: Thomas Hellstrom <>
Signed-off-by: Dave Airlie <>
Signed-off-by: Herton Ronaldo Krzesinski <>
 drivers/gpu/drm/ttm/ttm_page_alloc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)



diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index ebc6fac..578207e 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -749,7 +749,10 @@  static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
 	/* clear the pages coming from the pool if requested */
 	if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) {
 		list_for_each_entry(p, &plist, lru) {
-			clear_page(page_address(p));
+			if (PageHighMem(p))
+				clear_highpage(p);
+			else
+				clear_page(page_address(p));