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t=1578727828; bh=6Eq5J+hAXx9XXxlnxrfRXHh/HAz/bQl2TOjlEN45Elk=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=JpAnfsTj52a8mekfq3zgUnoSVJtE2Z1Lmg6XFo2DA2ctUSW/2sl5Gt6/NghNGpzbS OcETdhXI0FHO8e0iEl802r+D3UjDE/xq8H3ciCyHX3fj7hzuV7/hjt1Eg9pOXo/Mzu 72Vk9rmjJ6cRGMcnzwdZdJjboLMN54q/ZRQD4hLY= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from [192.168.1.2] ([78.48.100.149]) by smtp.web.de (mrweb103 [213.165.67.124]) with ESMTPSA (Nemesis) id 0MD8Fc-1itQM41PG0-00GcLT; Sat, 11 Jan 2020 08:30:28 +0100 Subject: Re: [v3] coccinelle: semantic patch to check for inappropriate do_div() calls To: Wen Yang , cocci@systeme.lip6.fr, kernel-janitors@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Gilles Muller , Greg Kroah-Hartman , Julia Lawall , Masahiro Yamada , =?UTF-8?Q?Matthias_M=c3=a4nnich?= , Michal Marek , Nicolas Palix , Thomas Gleixner References: <20200110131526.60180-1-wenyang@linux.alibaba.com> <91abb141-57b8-7659-25ec-8080e290d846@web.de> From: Markus Elfring Autocrypt: addr=Markus.Elfring@web.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:cEmH2Bt3J3aClGJ0ZcUOZi7Unb9EtVQy5vxv468r8yQXi1SNcBM L55Xv2QHTKUc2uWbs+n+KUS2qOhTtiJG7qBILH1B5FNELrCbOrmJmGTTNyuiEnuV5aIXQAA lQpgKQPr9oZTZnbKHy4IBGkhS9WHP+zB5CdYrELPe69Gvkik1lbrJWNJdvDaztGjzSnko9Q 1f9rHwv7fRKM63WPG99rQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:NuLxLJDJoH8=:0Q6ALifB8ghzjkzRIyqjTL CU+Koqo8853URtyTMUHulfRttcZ+fyF4JC6jOO8PjJ4ycPt+3GeS68Lip2Ow8St9HF0xkLk53 LErkpNxiWsSKBrTZMKwMdV1HT3lCUdaxsfpPGR5GJ8SttrDX8BHHJ3mJA4TF5+dw4UvTUGPlC /YHwxuF8cF3KTt+QZc/PJ+7DkzWrhPqU6fgbQw71G3nXj4BJT9JcZrTDrjuS3D0VbGYnYizo2 e2Fgp5k7f1INTxETEfPs61xIddYcvTijxdn60REZirqtzLuOZZ5wrjS0I9TbszU+M+vrF5Amt R1A6wLvx4++muUjje1Z/UIYyM1rdV2o8aUTVhsZx/V2bNqaaGih2L9ZDMCbRp6Az+v8sM3O9z V4HePSy8qMKJ9MmJQlFpwbmAADEWc32klCcCABAUO+Pf1gq51JZ4nPlxYboGK8ubPL4CGJ2a4 U9yksbuplPfRJmh3Pd691TZs2QoQN1QJuFTk6ymgslroqA5/tShEXcP73S1IUf8g6//cnKnhW I6SJjdOefa95QFz5UOoHIinuqYCjK9P46ZXbwp8qIMUqYsZ504r0Ve5eu/BhFNpYaDtXwKuAY s5B9pky/CVZZj6cxJbZGU5Hoz13GzwH4fUlX8IOKdVbwd7A2oK9XOcVd+wFf5BPiGDHzNCvGr U7ha+jh5lhzjudOaa53gQYKbEJx+j/0nFPYWvREF4n00loR7lH1uwg+cwYRPuA8yr65YldEUG 7IX4omPbenkft1f2SNqhRq1e9WpwIwdo/CtuVVZOsYDu1V8GhvoFw4Y7ooJaCF2ssLwl8d5Fw s/qgm5haABCMa1L3f0yNZ2NIJ8vm1IKVsZWCRxRtsB3V/MTKusQmahxQEuIWjdBnNysP75tdu jw5rX0xxERw1+IiCiiu3UVduDknP8wQXuQHKCFgpN6evTuvZpV2HMj3UjDsxucBmy7EOITbaG pB11oGNSuq04Ngoja5agnu5A2l1ZVBb8ff18ebbEFAgtMYtucBlxuyUc4br9uai/6FLKX9p/b m1aLDliBJhZdcReXHNL9NkhNcCAh+8c7en6fDnu6/P8nfMc3G1wLU8lfKPkKxm0N0Gkr6o1Xl k85m6XMnR2zBn+l+kbBKQTh/Kf42zK77V9mSWywvL7v3EvYvMFquv/NZarDJx7MV0me9PKT3J 11Wxj+AN1vUjzGSLtWTfOBlC/qNR/I7cUC94FbyFfYGydcStX9TlOv9qc6e6GmiVKtNCDb/0f UAjoEoqwyFdChw23gK2j1xUnV/DFKS3bbplwr/52fIQ/o2id6CSclSoz+f7M= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >> * I suggest once more to adjust the dependency specifications for the u= sage >> =C2=A0 of these functions by SmPL rules. > > Most of the functions here are for all operation modes. I got an other understanding for this software. You added the information =E2=80=9Calso filter out safe consts for context= mode=E2=80=9D to the patch change log. >> * Can the local variable =E2=80=9Cmsg=E2=80=9D be omitted? I would appreciate another fine-tuning also at this place. >>> +coccilib.org.print_todo(p[0], construct_warnings("div64_ul")) >> >> I suggest again to move the prefix =E2=80=9Cdiv64_=E2=80=9D into the st= ring literal >> of the function implementation. > > =E2=80=9Cdiv64_ul=E2=80=9D indicates the function name we recommend. The intention can be fine. > If we delete the prefix "div64_", I suggest to use the text at an other place. > it may reduce readability. I find an other code variant also readable good enough. > +*do_div(f, \( l \| ul \| ul64 \| sl64 \) ); > > We agree with Julia: > I don't se any point to this. Can the avoidance of duplicate source code (according to SmPL disjunctions= ) trigger positive effects on run time characteristics and software maintena= nce? Regards, Markus