linux-kernel - [PATCH 3/5] hugetlb: update_and_free_page(): don't clear PG

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Date:	Tue,  8 Apr 2014 15:02:18 -0400
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, mtosatti@...hat.com,
	aarcange@...hat.com, mgorman@...e.de, akpm@...ux-foundation.org,
	andi@...stfloor.org, davidlohr@...com, rientjes@...gle.com,
	isimatu.yasuaki@...fujitsu.com, yinghai@...nel.org,
	riel@...hat.com, n-horiguchi@...jp.nec.com
Subject: [PATCH 3/5] hugetlb: update_and_free_page(): don't clear PG_reserved bit

Hugepages pages never get the PG_reserved bit set, so don't clear it. But
add a warning just in case.

Signed-off-by: Luiz Capitulino <lcapitulino@...hat.com>
Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
---
 mm/hugetlb.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 8674eda..c295bba 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -617,8 +617,9 @@ static void update_and_free_page(struct hstate *h, struct page *page)
 	for (i = 0; i < pages_per_huge_page(h); i++) {
 		page[i].flags &= ~(1 << PG_locked | 1 << PG_error |
 				1 << PG_referenced | 1 << PG_dirty |
-				1 << PG_active | 1 << PG_reserved |
-				1 << PG_private | 1 << PG_writeback);
+				1 << PG_active | 1 << PG_private |
+				1 << PG_writeback);
+		WARN_ON(PageReserved(&page[i]));
 	}
 	VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page);
 	set_compound_page_dtor(page, NULL);
-- 
1.8.1.4

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