linux-kernel - RE: echo 1 > /proc/sys/vm/compact_memory -> sh: write error: Bad address

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Date:	Fri, 28 Dec 2012 06:07:13 +0000
From:	Liu Hui-R64343 <r64343@...escale.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Mel Gorman <mgorman@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: echo 1 > /proc/sys/vm/compact_memory -> sh: write error: Bad
 address

>-----Original Message-----
>From: David Rientjes [mailto:rientjes@...gle.com]
>Sent: Friday, December 28, 2012 6:39 AM
>To: Liu Hui-R64343
>Cc: Mel Gorman; linux-kernel@...r.kernel.org
>Subject: Re: echo 1 > /proc/sys/vm/compact_memory -> sh: write error: Bad
>address
>
>On Thu, 27 Dec 2012, Liu Hui-R64343 wrote:
>
>> diff --git a/mm/compaction.c b/mm/compaction.c index c4bc5ac..d3cb27f
>> 100644
>> --- a/mm/compaction.c
>> +++ b/mm/compaction.c
>> @@ -732,8 +732,10 @@ int sysctl_compact_memory;  int
>> sysctl_compaction_handler(struct ctl_table *table, int write,
>>                         void __user *buffer, size_t *length, loff_t
>> *ppos)  {
>> -       if (write)
>> -               return compact_nodes();
>> +       if (write) {
>> +               compact_nodes();
>> +               return *length;
>> +       }
>>
>>         return 0;
>>  }
>
>No need to return the length at all, simply change compact_nodes() to return
>void, remove the return value, and do
>
>	if (write)
>		compact_nodes();
>	return 0;
>
>and it should be fixed. 

Yes,  this works. Thanks,

> Could you write a changelog that shows the before
>and after behavior (not necessarily the implementation), sign-off the patch
>as described in Documentation/SubmittingPatches, running
>scripts/get_maintainer.pl on your new patch file, and sending it to all
>addresses that are listed?

OK, I will send out the patch as you suggested.

Happy holiday.

Jason Liu

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