linux-kernel - [PATCH 3.12 034/103] mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus

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Message-Id: <4921f0b2e1fc49c368d6fd43bff5bdbd1e48dbb3.1401371259.git.jslaby@suse.cz>
Date:	Thu, 29 May 2014 15:48:19 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	"Mizuma, Masayoshi" <m.mizuma@...fujitsu.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Hocko <mhocko@...e.cz>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 034/103] mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus_pages()

From: "Mizuma, Masayoshi" <m.mizuma@...fujitsu.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 7848a4bf51b34f41fcc9bd77e837126d99ae84e3 upstream.

soft lockup in freeing gigantic hugepage fixed in commit 55f67141a892 "mm:
hugetlb: fix softlockup when a large number of hugepages are freed." can
happen in return_unused_surplus_pages(), so let's fix it.

Signed-off-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 mm/hugetlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index efbb9dc67f2f..92e103b72dcb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1177,6 +1177,7 @@ static void return_unused_surplus_pages(struct hstate *h,
 	while (nr_pages--) {
 		if (!free_pool_huge_page(h, &node_states[N_MEMORY], 1))
 			break;
+		cond_resched_lock(&hugetlb_lock);
 	}
 }
 
-- 
1.9.3

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