From: Li Haifeng <omycle@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Minchan Kim <minchan.kim@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] mm: Fixup abandoned PG_buddy for private in struct page
Date: Thu, 6 Sep 2012 17:11:18 +0800 [thread overview]
Message-ID: <CAFNq8R65BCuTn2BDAQ=5twA0epaeR9tdJ2HTRb1tEWM15j0hQA@mail.gmail.com> (raw)
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@gmail.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
next reply other threads:[~2012-09-06 9:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-06 9:11 Li Haifeng [this message]
2012-09-28 16:34 ` [PATCH 2/2] mm: Fixup abandoned PG_buddy for private in struct page Johannes Weiner
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