linux-kernel - Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

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Message-ID: <20101020182851.GP8781@llucax.com.ar>
Date:	Wed, 20 Oct 2010 15:28:51 -0300
From:	Leandro Lucarella <luca@...cax.com.ar>
To:	Jon Maloy <jon.maloy@...csson.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	David Miller <davem@...emloft.net>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tipc-discussion@...ts.sourceforge.net" 
	<tipc-discussion@...ts.sourceforge.net>
Subject: Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

Jon Maloy, el 20 de octubre a las 14:10 me escribiste:
> <...>
> > > 
> > > Remember, permitting both is a superset of the current one 
> > (NBO only) 
> > > so it is fully backwards compatible. We break absolutly nothing by 
> > > permitting this.
> > > 
> > Thats effectively reverting both our patches though, isn't it 
> > (not that I'm disagreeing with it, just looking for 
> > clarification).  If we revert my patch and reintroduce the 
> > htohl mechanism which tracks endianess, we might as well 
> > revert the TIPC_SUB_SERVICE flag as well, yeah?
> 
> Absolutely. I think it was a mistake to change that value.
> But I don't think we need to reintroduce the htohl(). That
> was just one way of doing it. If I understood your suggestion
> from yesterday correctly you converted the whole message within
> one if()clause, without any htohl(). I have have no problem with 
> that approach.

There is a difference between both solutions, the htohl() version
tracked the need for swap as a struct subscription member (which was
used when sending back events). Neils patch doesn't do that tracking.
I don't really know the implications of this, but maybe it would be
a wise idea to stay in the safe side and revert both patches for now.

-- 
Leandro Lucarella (AKA luca)                     http://llucax.com.ar/
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