linux-kernel - Re: mmotm 2010-11-03-12-17: memcg build fail

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Date:	Fri, 5 Nov 2010 15:39:05 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	Greg Thelen <gthelen@...gle.com>,
	Andrea Righi <arighi@...eler.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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>
Subject: Re: mmotm 2010-11-03-12-17: memcg build fail

On Fri, Nov 5, 2010 at 2:55 PM, Dave Young <hidave.darkstar@...il.com> wrote:
> Forgot cc lkml
>
> On Fri, Nov 5, 2010 at 1:54 PM, Dave Young <hidave.darkstar@...il.com> wrote:
>> Hi,
>>
>> Build failed without __divdi3 on i386, known issue?
>>
>> 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
>>

We should have used do_div.
Below patch solve the problem?

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 76386f4..8e6bb59 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1247,18 +1247,19 @@ 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);

>> --
>> Regards
>> dave
>>
>
>
>
> --
> Regards
> dave
>



-- 
Kind regards,
Minchan Kim
--
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