linux-kernel - Re: [Patch] sctp: remove deprecated SCTP_GET_*

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Date:	Sat, 24 Oct 2009 10:41:58 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Vlad Yasevich <vladislav.yasevich@...com>
CC:	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [Patch] sctp: remove deprecated SCTP_GET_*_OLD stuffs

Vlad Yasevich wrote:
> 
> Sam Ravnborg wrote:
>> On Thu, Oct 22, 2009 at 04:53:30PM -0400, Vlad Yasevich wrote:
>>>> diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
>>>> index be2334a..0991f1b 100644
>>>> --- a/include/net/sctp/user.h
>>>> +++ b/include/net/sctp/user.h
>>>> @@ -131,14 +131,6 @@ enum sctp_optname {
>>>>  #define SCTP_SOCKOPT_BINDX_REM	SCTP_SOCKOPT_BINDX_REM
>>>>  	SCTP_SOCKOPT_PEELOFF, 	/* peel off association. */
>>>>  #define SCTP_SOCKOPT_PEELOFF	SCTP_SOCKOPT_PEELOFF
>>>> -	SCTP_GET_PEER_ADDRS_NUM_OLD, 	/* Get number of peer addresss. */
>>>> -#define SCTP_GET_PEER_ADDRS_NUM_OLD	SCTP_GET_PEER_ADDRS_NUM_OLD
>>>> -	SCTP_GET_PEER_ADDRS_OLD, 	/* Get all peer addresss. */
>>>> -#define SCTP_GET_PEER_ADDRS_OLD	SCTP_GET_PEER_ADDRS_OLD
>>>> -	SCTP_GET_LOCAL_ADDRS_NUM_OLD, 	/* Get number of local addresss. */
>>>> -#define SCTP_GET_LOCAL_ADDRS_NUM_OLD	SCTP_GET_LOCAL_ADDRS_NUM_OLD
>>>> -	SCTP_GET_LOCAL_ADDRS_OLD, 	/* Get all local addresss. */
>>>> -#define SCTP_GET_LOCAL_ADDRS_OLD	SCTP_GET_LOCAL_ADDRS_OLD
>>>>  	SCTP_SOCKOPT_CONNECTX_OLD, /* CONNECTX old requests. */
>>> After running the regression suite against this patch I find that we can't
>>> remove the enum values.  Removing the enums changes the value for the remainder
>>> of the definitions and breaks binary compatibility for applications that use
>>> those trailing options.
>>>
>>> You should be ok with removing the #defines and actual code that uses them,
>>> but not the enums.  You can even rename the enums, but we must preserve
>>> numeric ordering.
>> If we really depend on the actual value of an enum as in this case,
>> then e should assign them direct to better document this.
>>
>> 	Sam
>>
> 
> I agree.  I have a patch that converts the enum to just a #define section that
> I'll apply on top of this removal patch and document the deletion.

Hi, Vlad.

I was busy, sorry for joining late. Thanks for doing this!

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