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t=1561797360; bh=FbSJSMXHPnAlz0/Bg4By/65t5cyQvZuDWiA432ln34g=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=UC5H2GnbD/enRv/6CRF4z0LBxwZya82QF1ff69LYS7x7xPluno8iMhdk4E/zsGb21 TGMUg/BXhPvRXSKwkdQVtr6FxBizHKgQ8AO+AwA0oxv7HLT4LQ2j95q7gbq3Ltipt3 eS5QItT2BLlAi4TXLMrbpvL9kXQrMgS/knBr7plQ= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from [192.168.1.2] ([93.132.176.71]) by smtp.web.de (mrweb103 [213.165.67.124]) with ESMTPSA (Nemesis) id 0M8Qtq-1iTD0s0H6Q-00vw00; Sat, 29 Jun 2019 10:36:00 +0200 Subject: Re: [v2] coccinelle: semantic code search for missing of_node_put To: Julia Lawall , cocci@systeme.lip6.fr Cc: Wen Yang , linux-kernel@vger.kernel.org, Yi Wang , Gilles Muller , Nicolas Palix , Michal Marek , Masahiro Yamada References: <1561690732-20694-1-git-send-email-wen.yang99@zte.com.cn> <904b9362-cd01-ffc9-600b-0c48848617a0@web.de> <76641efc-2e3e-8664-03b2-4eb82f01c275@web.de> From: Markus Elfring Openpgp: preference=signencrypt Autocrypt: addr=Markus.Elfring@web.de; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:AyXXGYek5NqvBCp2FlWCupQhyIsRHY8QGsg7ZKLNjfTVv9dQnsT sS0gWrhCe8n/YdbaIXDaqf2Z6Q7ZphywHxY2I0qVpQF9+o/LkR6w0eqCw/2DeZY0Oo7IbVz 4U/Pt0k3CtPEBk+7keZi5LXEPHnefpOGq9WQk86kwhn29H0KGdDevhAQn2IcOf5WxuL5wWE mf0ZqNn9RuM850nhm3sKA== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:3qAJuQWmufk=:fq1GzgN0iop32YdR4pxKjB 2m5hgQ9jO/71aMZPItYBeBdHcrdZ7GXHKO2/FGNGTp2HmTrv+iGFzR3rC2CcvvYoNLq5gcyTN FnK+NBp+UiMDBnEfkW9JkdoaZEJcvHpJCuvTYh6jJz19WxQAHx4WDWCy2By6//e4ybsmgGbnL 01Q7M6K16HhHQPV/itmXov1JbE97CBU8iicOBMYSNivzW1hsrZNTNNdAQFKPq+xe2Haf+QMGR bADXXnsyydmk3ylb0YUEJksLHLPX2kqMqvh4fSQUl/X8Pjvx3ou6YfbcffBNCaWmR+36ml8zw Zb7a5EPy3Q2cILcRE6OvkTs0MRTJQTk+LmE1lN9ge8SLctT0ZmLQ5tswkbmeT7Wn7o0kMMBV7 IObzXo0hLTI/j69mQWLP9rSGoIvru4vz1lewXEPPkPoO1Xdf8ORF/y7isx5kfgg9B0ljzQYr9 wKAAf6F3vY3IAWNWFQ96eLpbsjL72IjsSlEO15IXfa4uXX9Kc+yLTpxpu6Lt1zx7uXzW4o+3u RFGPnKodZxxw+xMySo91tYI5iv/F+wD7PmikdQUqr0q5iIlbnZkQjxmMbvuIcTxRid5fkIq24 lxm0fpiUXn0Ur5e7wYxVMhSR9sylYcQOZNwo1/p3Xz2CwUK7FkX/J6MekhhtbHVxSBCmrykWH Zye2ixwjrqjN2GAqVg9aje4afN7hVquQziHGmCqroqO4zxHM+XXeLcD1EZxtwynowd1CAtxZA oUDkIqXU+hrjlgLGNFDcaI885mV9oSAGQkvzq/zVFLm84OHMsJSR0Z4Hz12VQdvEWcWedjYjS 0qFAcT2hpzes50aMl4mmq9lwaCeSiXEUfyb16SJgVR1sopZAeffBcWultJaE+rpO1qL4qWjNv 91MSIk4KBS/es38PLPnBhj773pyeqzlN/FmhDT+o9WZl+Es5l4FvZVY+L+eVaj0epQz5Bj951 seada+lJpwqoTpv7BxE3gWQ2mvH4hqPX05Y8nBqjWy4LTnGZc4N75CuVGyLJOBQJ3SvnA+0iT pfT1GUOLEd3HY1zCNrwcX/+n4zLGshwb8DyAF85B9MtBSndvJuB/XKYBblliEHdW9KhJWtwu6 nGRmfqZ70phx0kgPPH+hXwvwglvRc77GPca Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>> +if (x =3D=3D NULL || ...) S >>>> +... when !=3D e =3D (T)x >>>> + when !=3D true x =3D=3D NULL =E2=80=A6 > I assume that it was added because it was found to be useful. We can get different software development opinions also on this implementation detail. > Please actually try things out before declaring them to be useless. Further clarification of desirable software behaviour will help. I dare to express doubts around the SmPL functionality =E2=80=9Cwhen !=3D = true x =3D=3D NULL=E2=80=9D. Would any more contributors like to share additional insights for the safe= r application of the semantic patch language? Is a reassignment of such local variable an usual precondition for the discussed programming concern? Regards, Markus