linux-kernel - [PATCH] memcg: use do_div to divide s64 in 32 bit machine.

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Date:	Sat,  6 Nov 2010 01:08:53 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dave Young <hidave.darkstar@...il.com>,
	Greg Thelen <gthelen@...gle.com>,
	Andrea Righi <arighi@...eler.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Minchan Kim <minchan.kim@...il.com>
Subject: [PATCH] memcg: use do_div to divide s64 in 32 bit machine.

Use do_div to divide s64 value. Otherwise, build would be failed
like Dave Young reported.

mm/built-in.o: In function `mem_cgroup_dirty_info':
/home/dave/vdb/build/mm/linux-2.6.36/mm/memcontrol.c:1251: undefined
reference to `__divdi3'
/home/dave/vdb/build/mm/linux-2.6.36/mm/memcontrol.c:1259: undefined
reference to `__divdi3'
make: *** [.tmp_vmlinux1] Error 1

Tested-by: Dave Young <hidave.darkstar@...il.com>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 mm/memcontrol.c |   16 +++++++++-------
 1 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 76386f4..a15d95e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1247,18 +1247,20 @@ bool mem_cgroup_dirty_info(unsigned long sys_available_mem,
 	if (dirty_param.dirty_bytes)
 		info->dirty_thresh =
 			DIV_ROUND_UP(dirty_param.dirty_bytes, PAGE_SIZE);
-	else
-		info->dirty_thresh =
-			(dirty_param.dirty_ratio * available_mem) / 100;
+	else {
+		info->dirty_thresh = dirty_param.dirty_ratio * available_mem;
+		do_div(info->dirty_thresh, 100);
+	}
 
 	if (dirty_param.dirty_background_bytes)
 		info->background_thresh =
 			DIV_ROUND_UP(dirty_param.dirty_background_bytes,
 				     PAGE_SIZE);
-	else
-		info->background_thresh =
-			(dirty_param.dirty_background_ratio *
-			       available_mem) / 100;
+	else {
+		info->background_thresh = dirty_param.dirty_background_ratio *
+			available_mem;
+		do_div(info->background_thresh, 100);
+	}
 
 	info->nr_reclaimable =
 		mem_cgroup_page_stat(MEMCG_NR_RECLAIM_PAGES);
-- 
1.7.0.5

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