linux-kernel - Re: [patch -mm] mm, thp: fix mlock statistics fix

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Message-Id: <20121003142519.93375e01.akpm@linux-foundation.org>
Date:	Wed, 3 Oct 2012 14:25:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michel Lespinasse <walken@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch -mm] mm, thp: fix mlock statistics fix

On Wed, 3 Oct 2012 14:10:41 -0700 (PDT)
David Rientjes <rientjes@...gle.com> wrote:

> > The free_page_mlock() hunk gets dropped because free_page_mlock() is
> > removed.  And clear_page_mlock() doesn't need this treatment.  But
> > please check my handiwork.
> > 
> 
> I reviewed what was merged into -mm and clear_page_mlock() does need this 
> fix as well.

argh, it got me *again*.  grr.

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: mm: document PageHuge somewhat

Cc: David Rientjes <rientjes@...gle.com>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 mm/hugetlb.c |    5 +++++
 1 file changed, 5 insertions(+)

diff -puN mm/hugetlb.c~mm-document-pagehuge-somewhat mm/hugetlb.c
--- a/mm/hugetlb.c~mm-document-pagehuge-somewhat
+++ a/mm/hugetlb.c
@@ -671,6 +671,11 @@ static void prep_compound_gigantic_page(
 	}
 }
 
+/*
+ * PageHuge() only returns true for hugetlbfs pages, but not for normal or
+ * transparent huge pages.  See the PageTransHuge() documentation for more
+ * details.
+ */
 int PageHuge(struct page *page)
 {
 	compound_page_dtor *dtor;
_


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