netdev - Re: [PATCH net-next] xfrm: remove useless hash_resize

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Date:	Fri, 29 Aug 2014 09:42:10 +0200
From:	Christophe Gouault <christophe.gouault@...nd.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	Ying Xue <ying.xue@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] xfrm: remove useless hash_resize_mutex locks

2014-08-29 8:11 GMT+02:00 Steffen Klassert <steffen.klassert@...unet.com>:
> Ccing Christophe Gouault as he currently reworks the policy
> hashing.

Thanks.

> One of Christophes patches will use this mutex in a worker of
> another work queue, so this mutex is really needed if I apply
> his patchset. See http://patchwork.ozlabs.org/patch/383486/

Yes right, the mutex is actually needed after this patch.

> I tend to apply Christophes patchset after some further testing,
> so we can't remove this mutex now.

>>  /* Generate new index... KAME seems to generate them ordered by cost
>> diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
>> index 0ab5413..de971b6 100644
>> --- a/net/xfrm/xfrm_state.c
>> +++ b/net/xfrm/xfrm_state.c
>> @@ -97,8 +97,6 @@ static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
>>       return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
>>  }
>>
>> -static DEFINE_MUTEX(hash_resize_mutex);
>> -
>
> This one is still redundant, so we can remove it if there
> are no plans to do something similar to the xfrm_state
> hashing soon. Christophe?

I have no plans to work on the xfrm_state hashing soon. I think this
mutex can be removed.

Best Regards,
Christophe
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