[PATCH] Hugepages need clear_user_highpage() not clear_highpage()
When hugepages are newly allocated to a file in mm/hugetlb.c, we clear them
with a call to clear_highpage() on each of the subpages. We should be
using clear_user_highpage(): on powerpc, at least, clear_highpage() doesn't
correctly mark the page as icache dirty so if the page is executed shortly
after it's possible to get strange results.
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Acked-by: William Lee Irwin III <wli@holomorphy.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ceb3ebb..3255ca4 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -107,7 +107,7 @@
set_page_count(page, 1);
page[1].mapping = (void *)free_huge_page;
for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i)
- clear_highpage(&page[i]);
+ clear_user_highpage(&page[i], addr);
return page;
}