netdev - Re: [net-next bugfix] net, rps: fix build failure when CONFIG

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Date:	Tue, 31 Dec 2013 15:58:39 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	zwu.kernel@...il.com
Cc:	netdev@...r.kernel.org, therbert@...gle.com,
	fengguang.wu@...el.com, wuzhy@...ux.vnet.ibm.com
Subject: Re: [net-next bugfix] net, rps: fix build failure when CONFIG_RPS
 isn't set

From: David Miller <davem@...emloft.net>
Date: Tue, 31 Dec 2013 15:54:59 -0500 (EST)

> From: Zhi Yong Wu <zwu.kernel@...il.com>
> Date: Wed,  1 Jan 2014 04:31:01 +0800
> 
>> @@ -846,12 +846,16 @@ static inline void sock_rps_reset_flow_hash(__u32 hash)
>>  
>>  static inline void sock_rps_record_flow(const struct sock *sk)
>>  {
>> +#ifdef CONFIG_RPS
>>  	sock_rps_record_flow_hash(sk->sk_rxhash);
>> +#endif
>>  }
> 
> Why is this necessary?  sock_rps_record_flow_hash() is provided
> unconditionally, regardless of CONFIG_RPS.
> 
> I'm not applying this, it doesn't make any sense.  Either there is
> no build failure, or the existing CONFIG_RPS ifdef inside of the
> implementation of sock_rps_record_flow_hash() is bogus.

Ok, if you had actually provided the build failure log message I'd be
able to evaluate this patch much better.

The real issue is the lack of sk_rxhash when RPS is not enabled.

I'm going to apply this with the build failure message mentioned.
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