[PATCH] mm, hugetlb: correct missing private flag clearing

[Joonsoo Kim]

We should clear the page's private flag when returing the page to
the hugepage pool. Otherwise, marked hugepage can be allocated to
the user who tries to allocate the non-reserved hugepage. If this user
fail to map this hugepage, he would try to return the page to the
hugepage pool. Since this page has a private flag, resv_huge_pages would
mistakenly increase. This patch fixes this situation.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index b49579c..691f226 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -653,6 +653,7 @@ static void free_huge_page(struct page *page)
 	BUG_ON(page_count(page));
 	BUG_ON(page_mapcount(page));
 	restore_reserve = PagePrivate(page);
+	ClearPagePrivate(page);
 
 	spin_lock(&hugetlb_lock);
 	hugetlb_cgroup_uncharge_page(hstate_index(h),
-- 
1.7.9.5

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