linux-kernel - [PATCH v2, part2 01/10] mm: introduce free_highmem_page() helper to free highmem pages into buddy system

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Date:	Sun, 10 Mar 2013 16:01:01 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>
Cc:	Jiang Liu <jiang.liu@...wei.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Russell King <linux@....linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	James Hogan <james.hogan@...tec.com>,
	Michal Simek <monstr@...str.eu>,
	Ralf Baechle <ralf@...ux-mips.org>,
	David Daney <david.daney@...ium.com>,
	"David S. Miller" <davem@...emloft.net>,
	Sam Ravnborg <sam@...nborg.org>, Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH v2, part2 01/10] mm: introduce free_highmem_page() helper to free highmem pages into buddy system

Introduce helper function free_highmem_page(), which will be used by
architectures with HIGHMEM enabled to free highmem pages into the buddy
system.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Michel Lespinasse <walken@...gle.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Michal Nazarewicz <mina86@...a86.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Cc: Russell King <linux@....linux.org.uk>
Cc: David Howells <dhowells@...hat.com>
Cc: James Hogan <james.hogan@...tec.com>
Cc: Michal Simek <monstr@...str.eu>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: David Daney <david.daney@...ium.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 include/linux/mm.h |    7 +++++++
 mm/page_alloc.c    |    9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d75c14b..f2fb750 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1303,6 +1303,13 @@ extern void free_initmem(void);
  */
 extern unsigned long free_reserved_area(unsigned long start, unsigned long end,
 					int poison, char *s);
+#ifdef	CONFIG_HIGHMEM
+/*
+ * Free a highmem page into the buddy system, adjusting totalhigh_pages
+ * and totalram_pages.
+ */
+extern void free_highmem_page(struct page *page);
+#endif
 
 static inline void adjust_managed_page_count(struct page *page, long count)
 {
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0fadb09..37bc8ab 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5133,6 +5133,15 @@ unsigned long free_reserved_area(unsigned long start, unsigned long end,
 	return pages;
 }
 
+#ifdef	CONFIG_HIGHMEM
+void free_highmem_page(struct page *page)
+{
+	__free_reserved_page(page);
+	totalram_pages++;
+	totalhigh_pages++;
+}
+#endif
+
 /**
  * set_dma_reserve - set the specified number of pages reserved in the first zone
  * @new_dma_reserve: The number of pages to mark reserved
-- 
1.7.9.5

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