linux-kernel - [-mm][PATCH 1/5] fix munlock page table walk

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Message-Id: <20080619180721.E802.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Thu, 19 Jun 2008 18:08:54 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [-mm][PATCH 1/5]  fix munlock page table walk

From: Lee Schermerhorn <lee.schermerhorn@...com>

PATCH:  fix munlock page table walk - now requires 'mm'

Against 2.6.26-rc5-mm3.

Initialize the 'mm' member of the mm_walk structure, else the
page table walk doesn't occur, and mlocked pages will not be
munlocked.  This is visible in the vmstats:  

	noreclaim_pgs_munlocked - should equal noreclaim_pgs_mlocked
	  less (nr_mlock + noreclaim_pgs_cleared), but is always zero 
	  [munlock_vma_page() never called]

	noreclaim_pgs_mlockfreed - should be zero [for debug only],
	  but == noreclaim_pgs_mlocked - (nr_mlock + noreclaim_pgs_cleared)


Signed-off-by: Lee Schermerhorn <lee.schermerhorn@...com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

 mm/mlock.c |    1 +
 1 file changed, 1 insertion(+)

Index: b/mm/mlock.c
===================================================================
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -301,6 +301,7 @@ static void __munlock_vma_pages_range(st
 		.pmd_entry = __munlock_pmd_handler,
 		.pte_entry = __munlock_pte_handler,
 		.private = &mpw,
+		.mm = mm,
 	};
 
 	VM_BUG_ON(start & ~PAGE_MASK || end & ~PAGE_MASK);


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