linux-kernel - Re: [PATCH] net: sctp: Rename fallthrough label to unhandled

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Message-ID: <20190731121646.GD9823@hmswarspite.think-freely.org>
Date:   Wed, 31 Jul 2019 08:16:46 -0400
From:   Neil Horman <nhorman@...driver.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Vlad Yasevich <vyasevich@...il.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sctp: Rename fallthrough label to unhandled

On Wed, Jul 31, 2019 at 04:32:43AM -0700, Joe Perches wrote:
> On Wed, 2019-07-31 at 07:19 -0400, Neil Horman wrote:
> > On Tue, Jul 30, 2019 at 10:04:37PM -0700, Joe Perches wrote:
> > > fallthrough may become a pseudo reserved keyword so this only use of
> > > fallthrough is better renamed to allow it.
> > > 
> > > Signed-off-by: Joe Perches <joe@...ches.com>
> > Are you referring to the __attribute__((fallthrough)) statement that gcc
> > supports?  If so the compiler should by all rights be able to differentiate
> > between a null statement attribute and a explicit goto and label without the
> > need for renaming here.  Or are you referring to something else?
> 
> Hi.
> 
> I sent after this a patch that adds
> 
> # define fallthrough                    __attribute__((__fallthrough__))
> 
> https://lore.kernel.org/patchwork/patch/1108577/
> 
> So this rename is a prerequisite to adding this #define.
> 
why not just define __fallthrough instead, like we do for all the other
attributes we alias (i.e. __read_mostly, __protected_by, __unused, __exception,
etc)

Neil

> > > diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> []
> > > @@ -2152,7 +2152,7 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
> > >  	case SCTP_PARAM_SET_PRIMARY:
> > >  		if (net->sctp.addip_enable)
> > >  			break;
> > > -		goto fallthrough;
> > > +		goto unhandled;
> 
> etc...
> 
> 
>