linux-kernel - [PATCH v2, part2 09/10] mm/um: use free_highmem_page() to free highmem pages into buddy system

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Date:	Sun, 10 Mar 2013 16:01:09 +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, Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: [PATCH v2, part2 09/10] mm/um: use free_highmem_page() to free highmem pages into buddy system

Use helper function free_highmem_page() to free highmem pages into
the buddy system.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
Cc: user-mode-linux-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
---
 arch/um/kernel/mem.c |   16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index d5ac802..9df292b 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -42,17 +42,12 @@ static unsigned long brk_end;
 static void setup_highmem(unsigned long highmem_start,
 			  unsigned long highmem_len)
 {
-	struct page *page;
 	unsigned long highmem_pfn;
 	int i;
 
 	highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT;
-	for (i = 0; i < highmem_len >> PAGE_SHIFT; i++) {
-		page = &mem_map[highmem_pfn + i];
-		ClearPageReserved(page);
-		init_page_count(page);
-		__free_page(page);
-	}
+	for (i = 0; i < highmem_len >> PAGE_SHIFT; i++)
+		free_highmem_page(&mem_map[highmem_pfn + i]);
 }
 #endif
 
@@ -73,18 +68,13 @@ void __init mem_init(void)
 	totalram_pages = free_all_bootmem();
 	max_low_pfn = totalram_pages;
 #ifdef CONFIG_HIGHMEM
-	totalhigh_pages = highmem >> PAGE_SHIFT;
-	totalram_pages += totalhigh_pages;
+	setup_highmem(end_iomem, highmem);
 #endif
 	num_physpages = totalram_pages;
 	max_pfn = totalram_pages;
 	printk(KERN_INFO "Memory: %luk available\n",
 	       nr_free_pages() << (PAGE_SHIFT-10));
 	kmalloc_ok = 1;
-
-#ifdef CONFIG_HIGHMEM
-	setup_highmem(end_iomem, highmem);
-#endif
 }
 
 /*
-- 
1.7.9.5

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