Reposting from this kernel bug:
https://bugzilla.kernel.org/show_bug.cgi?id=50241
I've tested the patch and it solves a highly repeatable OOPS with the
CedarView driver that I'm porting.
>From 3552913d3a1c2d3c4ce158e91dc18cd12b522cb2 Mon Sep 17 00:00:00 2001
From: Yakui Zhao <yakui.z...@intel.com>
Date: Tue, 7 Feb 2012 15:33:13 -0500
Subject: [PATCH] Clear the ttm page allocated from high memory zone correctly
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.
Signed-off-by: Zhao Yakui <yakui.z...@intel.com>
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c
b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index d948575..df976d9 100644
--- 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 *pages, int flags,
/* 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));
}
}
--
1.7.7.6
--
From: Jonathan Morton
jonathan.mor...@movial.com
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