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=-11.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 6DDA0C433E2 for ; Tue, 1 Sep 2020 10:09:07 +0000 (UTC) Received: from isis.lip6.fr (isis.lip6.fr [132.227.60.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D5F09206A5 for ; Tue, 1 Sep 2020 10:09:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D5F09206A5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=inria.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=cocci-bounces@systeme.lip6.fr Received: from systeme.lip6.fr (systeme.lip6.fr [132.227.104.7]) by isis.lip6.fr (8.15.2/8.15.2) with ESMTP id 081A8lWE002571; Tue, 1 Sep 2020 12:08:47 +0200 (CEST) Received: from systeme.lip6.fr (systeme.lip6.fr [127.0.0.1]) by systeme.lip6.fr (Postfix) with ESMTP id 9D438742E; Tue, 1 Sep 2020 12:08:47 +0200 (CEST) Received: from isis.lip6.fr (isis.lip6.fr [132.227.60.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by systeme.lip6.fr (Postfix) with ESMTPS id 1CB014385 for ; Tue, 1 Sep 2020 12:08:45 +0200 (CEST) Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by isis.lip6.fr (8.15.2/8.15.2) with ESMTPS id 081A8iiW016914 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 1 Sep 2020 12:08:44 +0200 (CEST) X-IronPort-AV: E=Sophos;i="5.76,359,1592863200"; d="scan'208";a="357781665" Received: from abo-173-121-68.mrs.modulonet.fr (HELO hadrien) ([85.68.121.173]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 Sep 2020 12:08:43 +0200 Date: Tue, 1 Sep 2020 12:08:43 +0200 (CEST) From: Julia Lawall X-X-Sender: jll@hadrien To: Denis Efremov In-Reply-To: <20200901094812.428896-1-efremov@linux.com> Message-ID: References: <20200811210127.11889-1-efremov@linux.com> <20200901094812.428896-1-efremov@linux.com> User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 X-Greylist: Sender IP whitelisted, Sender e-mail whitelisted, not delayed by milter-greylist-4.4.3 (isis.lip6.fr [132.227.60.2]); Tue, 01 Sep 2020 12:08:47 +0200 (CEST) X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.4.3 (isis.lip6.fr [132.227.60.2]); Tue, 01 Sep 2020 12:08:44 +0200 (CEST) X-Scanned-By: MIMEDefang 2.78 on 132.227.60.2 X-Scanned-By: MIMEDefang 2.78 on 132.227.60.2 Cc: "Gustavo A . R . Silva" , cocci@systeme.lip6.fr, Kees Cook , linux-kernel@vger.kernel.org Subject: Re: [Cocci] [PATCH v3] coccinelle: misc: add uninitialized_var.cocci script X-BeenThere: cocci@systeme.lip6.fr X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: cocci-bounces@systeme.lip6.fr Errors-To: cocci-bounces@systeme.lip6.fr On Tue, 1 Sep 2020, Denis Efremov wrote: > uninitialized_var() macro was removed from the sources [1] and > other warning-silencing tricks were deprecated [2]. The purpose of this > cocci script is to prevent new occurrences of uninitialized_var() > open-coded variants. > > [1] commit 63a0895d960a ("compiler: Remove uninitialized_var() macro") > [2] commit 4b19bec97c88 ("docs: deprecated.rst: Add uninitialized_var()") Thanks! I find that much more understandable. julia > > Cc: Kees Cook > Cc: Gustavo A. R. Silva > Signed-off-by: Denis Efremov > --- > Changes in v2: > - Documentation cited in the script's description > - kernel.org link added to the diagnostics messages > - "T *var = &var;" pattern removed > - "var =@p var", "var =@p *(&(var))" patterns added > Changes in v3: > - commit's description changed > > .../coccinelle/misc/uninitialized_var.cocci | 51 +++++++++++++++++++ > 1 file changed, 51 insertions(+) > create mode 100644 scripts/coccinelle/misc/uninitialized_var.cocci > > diff --git a/scripts/coccinelle/misc/uninitialized_var.cocci b/scripts/coccinelle/misc/uninitialized_var.cocci > new file mode 100644 > index 000000000000..8fa845cefe11 > --- /dev/null > +++ b/scripts/coccinelle/misc/uninitialized_var.cocci > @@ -0,0 +1,51 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/// > +/// Please, don't reintroduce uninitialized_var(). > +/// From Documentation/process/deprecated.rst: > +/// For any compiler warnings about uninitialized variables, just add > +/// an initializer. Using warning-silencing tricks is dangerous as it > +/// papers over real bugs (or can in the future), and suppresses unrelated > +/// compiler warnings (e.g. "unused variable"). If the compiler thinks it > +/// is uninitialized, either simply initialize the variable or make compiler > +/// changes. Keep in mind that in most cases, if an initialization is > +/// obviously redundant, the compiler's dead-store elimination pass will make > +/// sure there are no needless variable writes. > +/// > +// Confidence: High > +// Copyright: (C) 2020 Denis Efremov ISPRAS > +// Options: --no-includes --include-headers > +// > + > +virtual context > +virtual report > +virtual org > + > +@r@ > +identifier var; > +type T; > +position p; > +@@ > + > +( > +* T var =@p var; > +| > +* T var =@p *(&(var)); > +| > +* var =@p var > +| > +* var =@p *(&(var)) > +) > + > +@script:python depends on report@ > +p << r.p; > +@@ > + > +coccilib.report.print_report(p[0], > + "WARNING this kind of initialization is deprecated (https://www.kernel.org/doc/html/latest/process/deprecated.html#uninitialized-var)") > + > +@script:python depends on org@ > +p << r.p; > +@@ > + > +coccilib.org.print_todo(p[0], > + "WARNING this kind of initialization is deprecated (https://www.kernel.org/doc/html/latest/process/deprecated.html#uninitialized-var)") > -- > 2.26.2 > > _______________________________________________ Cocci mailing list Cocci@systeme.lip6.fr https://systeme.lip6.fr/mailman/listinfo/cocci