linux-kernel - [PATCH 2/2] mm: Fixup abandoned PG_buddy for private in struct page

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Message-ID: <CAFNq8R65BCuTn2BDAQ=5twA0epaeR9tdJ2HTRb1tEWM15j0hQA@mail.gmail.com>
Date:	Thu, 6 Sep 2012 17:11:18 +0800
From:	Li Haifeng <omycle@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] mm: Fixup abandoned PG_buddy for private in struct page

PG_buddy, an abandoned flag, indicates page(s) is/are free
and in buddy allocator. And when page(s) in buddy allocator,
the _mapcount will equal PAGE_BUDDY_MAPCOUNT_VALUE. So,
here, "_mapcount equals PAGE_BUDDY_MAPCOUNT_VALUE" instead
of "PG_buddy is set".

Signed-off-by: Haifeng Li <omycle@...il.com>
---
 include/linux/mm_types.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 704a626..49d9247 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -126,7 +126,8 @@ struct page {
                                                 * if PagePrivate set; used for
                                                 * swp_entry_t if PageSwapCache;
                                                 * indicates order in the buddy
-                                                * system if PG_buddy is set.
+                                                * system if _mapcount equals
+                                                * PAGE_BUDDY_MAPCOUNT_VALUE.
                                                 */
 #if USE_SPLIT_PTLOCKS
                spinlock_t ptl;
--
1.7.5.4
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