commit 83e8acc059f9b3075de6b4386488f09abc9a4868
Author: Andy Whitcroft <[EMAIL PROTECTED]>
Date: Sun Feb 24 02:10:08 2008 +0000
hugetlb: ensure we do not reference a surplus page after handing it to buddy
commit: e5df70ab194543522397fa3da8c8f80564a0f7d3
When we free a page via free_huge_page and we detect that we are in surplus
the page will be returned to the buddy. After this we no longer own the
page.
However at the end free_huge_page we clear out our mapping pointer from
page private. Even where the page is not a surplus we free the page to
the hugepage pool, drop the pool locks and then clear page private. In
either case the page may have been reallocated. BAD.
Make sure we clear out page private before we free the page.
Signed-off-by: Andy Whitcroft <[EMAIL PROTECTED]>
Acked-by: Adam Litke <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9c746cb..d95ce35 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -119,6 +119,7 @@ static void free_huge_page(struct page *page)
struct address_space *mapping;
mapping = (struct address_space *) page_private(page);
+ set_page_private(page, 0);
BUG_ON(page_count(page));
INIT_LIST_HEAD(&page->lru);
@@ -133,7 +134,6 @@ static void free_huge_page(struct page *page)
spin_unlock(&hugetlb_lock);
if (mapping)
hugetlb_put_quota(mapping, 1);
- set_page_private(page, 0);
}
/*
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