linux-kernel - Re: [PATCH 4/9] v4 Add mutex for add/remove of memory blocks

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Message-ID: <4C6008EA.8040601@austin.ibm.com>
Date:	Mon, 09 Aug 2010 08:55:54 -0500
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...abs.org, Greg KH <greg@...ah.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: Re: [PATCH 4/9] v4  Add mutex for add/remove of memory blocks

On 08/04/2010 11:53 PM, KAMEZAWA Hiroyuki wrote:
> On Tue, 03 Aug 2010 08:39:50 -0500
> Nathan Fontenot <nfont@...tin.ibm.com> wrote:
> 
>> Add a new mutex for use in adding and removing of memory blocks.  This
>> is needed to avoid any race conditions in which the same memory block could
>> be added and removed at the same time.
>>
>> Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>
> 
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> But a nitpick (see below)
> 
>> ---
>>  drivers/base/memory.c |    9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> Index: linux-2.6/drivers/base/memory.c
>> ===================================================================
>> --- linux-2.6.orig/drivers/base/memory.c	2010-08-02 13:35:00.000000000 -0500
>> +++ linux-2.6/drivers/base/memory.c	2010-08-02 13:45:34.000000000 -0500
>> @@ -27,6 +27,8 @@
>>  #include <asm/atomic.h>
>>  #include <asm/uaccess.h>
>>  
>> +static struct mutex mem_sysfs_mutex;
>> +
> 
> For static symbol of mutex, we usually do
> 	static DEFINE_MUTEX(mem_sysfs_mutex);
> 
> Then, extra calls of mutex_init() is not required.
> 

ok,  fixed in the next version of the patches.

-Nathan
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