linux-kernel - [ 15/89] ttm: Clear the ttm page allocated from high memory zone correctly

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Message-Id: <20121203143149.168857201@decadent.org.uk>
Date:	Mon, 03 Dec 2012 14:32:01 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Zhao Yakui <yakui.zhao@...el.com>,
	Thomas Hellstrom <thellstrom@...are.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 15/89] ttm: Clear the ttm page allocated from high memory zone correctly

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhao Yakui <yakui.zhao@...el.com>

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
page.

bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=50241

Signed-off-by: Zhao Yakui <yakui.zhao@...el.com>
Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/ttm/ttm_page_alloc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -708,7 +708,10 @@ int ttm_get_pages(struct list_head *page
 	/* clear the pages coming from the pool if requested */
 	if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) {
 		list_for_each_entry(p, pages, lru) {
-			clear_page(page_address(p));
+			if (PageHighMem(p))
+				clear_highpage(p);
+			else
+				clear_page(page_address(p));
 		}
 	}
 


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