netdev - Re: [PATCH net-next v2 6/7] rhashtable: initialize atomic nelems variable

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Date:	Wed, 7 Jan 2015 18:26:21 +0800
From:	Ying Xue <ying.xue@...driver.com>
To:	Thomas Graf <tgraf@...g.ch>
CC:	<davem@...emloft.net>, <jon.maloy@...csson.com>,
	<Paul.Gortmaker@...driver.com>, <erik.hugne@...csson.com>,
	<netdev@...r.kernel.org>, <tipc-discussion@...ts.sourceforge.net>
Subject: Re: [PATCH net-next v2 6/7] rhashtable: initialize atomic nelems
 variable

On 01/07/2015 05:53 PM, Thomas Graf wrote:
> On 01/07/15 at 01:41pm, Ying Xue wrote:
>> Signed-off-by: Ying Xue <ying.xue@...driver.com>
>> Cc: Thomas Graf <tgraf@...g.ch>
> 
> Is this really needed at all? We initialize the full rhashtable
> struct to 0 in rhashtable_init().
> 
> 

I am not sure whether we really need to reinitialize atomic variable
again although we have reset it with memset() or something else. But I
see many places in kernel where we do this, for example:

Although we use kmem_cache_zalloc() to allocate "net" structure instance
in net_alloc(), there are still several places where to reinitialize its
atomic variables again:

setup_net()
  atomic_set(&net->use_count, 0);

rt_genid_init()
  atomic_set(&net->ipv4.rt_genid, 0);
  atomic_set(&net->fnhe_genid, 0);

Can you please definitely confirm that the reinitialisation is redundant
for us?

Regards,
Ying




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