From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751463AbdBJDCN (ORCPT <rfc822;w@1wt.eu>);
        Thu, 9 Feb 2017 22:02:13 -0500
Received: from smtprelay0151.hostedemail.com ([216.40.44.151]:42776 "EHLO
        smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL)
        by vger.kernel.org with ESMTP id S1751025AbdBJDCM (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 9 Feb 2017 22:02:12 -0500
X-Session-Marker: 6A6F6540706572636865732E636F6D
X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,joe@perches.com,:::::::::::::::::::,RULES_HIT:41:355:379:541:599:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1373:1431:1437:1515:1516:1518:1534:1540:1593:1594:1711:1730:1747:1777:1792:2393:2559:2562:2691:2828:3138:3139:3140:3141:3142:3352:3622:3867:3874:4321:5007:6119:7576:7903:10004:10400:10848:11026:11232:11473:11658:11914:12043:12296:12438:12740:12760:12895:13069:13311:13357:13439:14181:14659:14721:21080:21434:21451:30054:30091,0,RBL:none,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:1,LUA_SUMMARY:none
X-HE-Tag: coal62_69e5c1bb91e4d
X-Filterd-Recvd-Size: 1938
Message-ID: <1486695726.2192.1.camel@perches.com>
Subject: Re: [PATCH 24/32] tools include: Add a __fallthrough statement
From: Joe Perches <joe@perches.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
        Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>, Wang Nan <wangnan0@huawei.com>,
        William Cohen <wcohen@redhat.com>
Date: Thu, 09 Feb 2017 19:02:06 -0800
In-Reply-To: <20170210013940.9998-25-acme@kernel.org>
References: <20170210013940.9998-1-acme@kernel.org>
         <20170210013940.9998-25-acme@kernel.org>
Content-Type: text/plain; charset="ISO-8859-1"
X-Mailer: Evolution 3.22.3-0ubuntu0.1 
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, 2017-02-09 at 22:39 -0300, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@redhat.com>
> 
> For cases where implicit fall through case labels are intended,
> to let us inform that to gcc >= 7:

I believe this should be added to compiler_gcc.h

> diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
[]
> @@ -126,4 +126,13 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
>  #define WRITE_ONCE(x, val) \
>  	({ union { typeof(x) __val; char __c[1]; } __u = { .__val = (val) }; __write_once_size(&(x), __u.__c, sizeof(x)); __u.__val; })
>  
> +
> +#ifndef __fallthrough
> +# if defined(__GNUC__) && __GNUC__ >= 7
> +#  define __fallthrough __attribute__ ((fallthrough))
> +# else
> +#  define __fallthrough
> +# endif
> +#endif
> +
>  #endif /* _TOOLS_LINUX_COMPILER_H */