From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC4D0C3A5A7 for ; Sat, 31 Aug 2019 15:54:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BBC6321874 for ; Sat, 31 Aug 2019 15:54:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728442AbfHaPyS (ORCPT ); Sat, 31 Aug 2019 11:54:18 -0400 Received: from mail-ed1-f65.google.com ([209.85.208.65]:43877 "EHLO mail-ed1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726354AbfHaPyR (ORCPT ); Sat, 31 Aug 2019 11:54:17 -0400 Received: by mail-ed1-f65.google.com with SMTP id w9so1119664edx.10; Sat, 31 Aug 2019 08:54:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=AKTao77VaiaPvCbgcc+WiGV1j5w0joNictAVXbGzljc=; b=R4ajDoerMmlECDnQkX99vdNxtcR7cn6zLBKaPiFd6KZCnw06bAe2VDoJ4ArsCyWk8P ZiK8Hbj5v+VF8dctBSwc37WbM8TW8+jThDbNmkiugCVGo3CmL+l8w86zBCAAb5FR60dv VCUMZAudSxbMEMK/JquwOlQE/j7S2pRAcIYJ45HoQcc0E2HiHKnIUKgqmr9O8gg8lR3x ZtVLcXoKlZ1dRPzDopAYXdOb7hi/FOBA+5cMo0Jej3+ZgpMQQV3PMwlfKCyKIG4eLgte VD5WDiaMoCrWLwh8kCl8JGBifF0zOkAZ8crgWekjX0pWD1qDYnKj6v0+1tjW2fBHc3Ud 31QQ== X-Gm-Message-State: APjAAAVv2B3RSpB1gxtnN1XWEGmKpnQvo63WK5qoxTkrWaxACy3R59Cm 5rc35+qpVErn8HRiim3fTKA= X-Google-Smtp-Source: APXvYqyUxiSvMtW/KeHJ5cA0AWsETqOjW7ApTaHBEHBAazWa/5cJ0LHfDHET8v0+ffDbuRqUR6oAiw== X-Received: by 2002:a05:6402:154e:: with SMTP id p14mr21582628edx.101.1567266854794; Sat, 31 Aug 2019 08:54:14 -0700 (PDT) Received: from [10.68.32.192] (broadband-188-32-48-208.ip.moscow.rt.ru. [188.32.48.208]) by smtp.gmail.com with ESMTPSA id i19sm1234644ejf.7.2019.08.31.08.54.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 31 Aug 2019 08:54:14 -0700 (PDT) Subject: Re: [PATCH v3 01/11] checkpatch: check for nested (un)?likely() calls To: Markus Elfring , Joe Perches Cc: Andrew Morton , Anton Altaparmakov , Andy Whitcroft , Boris Ostrovsky , Boris Pismenny , "Darrick J. Wong" , "David S. Miller" , Dennis Dalessandro , Dmitry Torokhov , dri-devel@lists.freedesktop.org, Inaky Perez-Gonzalez , =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , Leon Romanovsky , linux-arm-msm@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ntfs-dev@lists.sourceforge.net, linux-rdma@vger.kernel.org, linux-wimax@intel.com, linux-xfs@vger.kernel.org, Mike Marciniszyn , netdev@vger.kernel.org, =?UTF-8?Q?Pali_Roh=c3=a1r?= , Rob Clark , Saeed Mahameed , Sean Paul , Alexander Viro , xen-devel@lists.xenproject.org, Enrico Weigelt References: <20190829165025.15750-1-efremov@linux.com> <0d9345ed-f16a-de0b-6125-1f663765eb46@web.de> From: Denis Efremov Message-ID: <689c8baf-2298-f086-3461-5cd1cdd191c6@linux.com> Date: Sat, 31 Aug 2019 18:54:12 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <0d9345ed-f16a-de0b-6125-1f663765eb46@web.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 31.08.2019 12:15, Markus Elfring wrote: >> +# nested likely/unlikely calls >> +        if ($line =~ /\b(?:(?:un)?likely)\s*\(\s*!?\s*(IS_ERR(?:_OR_NULL|_VALUE)?|WARN)/) { >> +            WARN("LIKELY_MISUSE", > > How do you think about to use the specification “(?:IS_ERR(?:_(?:OR_NULL|VALUE))?|WARN)” > in this regular expression? Hmm, (?: <- Catch group is required here, since it is used in diagnostic message, see $1 IS_ERR (?:_ <- Another atomic group just to show that '_' is a common prefix? I'm not sure about this. Usually, Perl interpreter is very good at optimizing such things. You could see this optimization if you run perl with -Mre=debug. (?:OR_NULL|VALUE))?|WARN) Regards, Denis