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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 38D9EC433DF for ; Sat, 6 Jun 2020 08:24:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E97C207D0 for ; Sat, 6 Jun 2020 08:24:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728649AbgFFIYx (ORCPT ); Sat, 6 Jun 2020 04:24:53 -0400 Received: from mail3-relais-sop.national.inria.fr ([192.134.164.104]:22690 "EHLO mail3-relais-sop.national.inria.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725283AbgFFIYw (ORCPT ); Sat, 6 Jun 2020 04:24:52 -0400 X-IronPort-AV: E=Sophos;i="5.73,479,1583190000"; d="scan'208";a="350759865" 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; 06 Jun 2020 10:24:50 +0200 Date: Sat, 6 Jun 2020 10:24:50 +0200 (CEST) From: Julia Lawall X-X-Sender: jll@hadrien To: Denis Efremov cc: Joe Perches , cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org Subject: Re: [Cocci] [PATCH 1/2] Coccinelle: extend memdup_user transformation with GFP_USER In-Reply-To: <20200530205348.5812-2-efremov@linux.com> Message-ID: References: <20200530205348.5812-1-efremov@linux.com> <20200530205348.5812-2-efremov@linux.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 30 May 2020, Denis Efremov wrote: > Match GFP_USER allocations with memdup_user.cocci rule. > Commit 6c2c97a24f09 ("memdup_user(): switch to GFP_USER") switched > memdup_user() from GFP_KERNEL to GFP_USER. In most cases it is still > a good idea to use memdup_user() for GFP_KERNEL allocations. The > motivation behind altering memdup_user() to GFP_USER is here: > https://lkml.org/lkml/2018/1/6/333 Should the rule somehow document the cases in which memdup_user should now not be used? julia > > Signed-off-by: Denis Efremov > --- > scripts/coccinelle/api/memdup_user.cocci | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci > index c809ab10bbce..49f487e6a5c8 100644 > --- a/scripts/coccinelle/api/memdup_user.cocci > +++ b/scripts/coccinelle/api/memdup_user.cocci > @@ -20,7 +20,7 @@ expression from,to,size; > identifier l1,l2; > @@ > > -- to = \(kmalloc\|kzalloc\)(size,GFP_KERNEL); > +- to = \(kmalloc\|kzalloc\)(size,\(GFP_KERNEL\|GFP_USER\)); > + to = memdup_user(from,size); > if ( > - to==NULL > @@ -43,7 +43,7 @@ position p; > statement S1,S2; > @@ > > -* to = \(kmalloc@p\|kzalloc@p\)(size,GFP_KERNEL); > +* to = \(kmalloc@p\|kzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\)); > if (to==NULL || ...) S1 > if (copy_from_user(to, from, size) != 0) > S2 > -- > 2.26.2 > > _______________________________________________ > Cocci mailing list > Cocci@systeme.lip6.fr > https://systeme.lip6.fr/mailman/listinfo/cocci >