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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6AB6BF8A16D for ; Thu, 16 Apr 2026 12:30:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ZpGC3wuyg/c7OK0I+Ry3K4iqeCH4Iha89YMbATdQXJw=; b=lVlSCptQ7SmYc6 9A3EWv7vkJlkBRbdECJ+qcgAtumylUV8eCI0ua7aB002VcC8vzoBOm6yLBGjVEuxMDp1yUQV0Ia3e tSZJ8XZI+Vmhdlg+7Tc00Fszfnu5avccAszN19Zk55TgySNvhoOad3IexrAPJSKT3UIIh5fIVv9XN wnPdoLh+mMXzF92Xqifc+33a9Pn4WPF0VZHMOAhZQgU6DkmUeVaKAuyW2RLpqNjrXYJqCaUuQ2AAH iNvrr9Q3Y6ONdGSCPppHWutMxuIYy1owx+JMLxCCn/mLk88hzdBSdl1uZXobAVAM37OZZVLSG4ANL Y6XK2B5GGs7rMOtB1hGA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wDLs1-00000002RK3-0RQm; Thu, 16 Apr 2026 12:30:57 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wDLry-00000002RJR-1ka0; Thu, 16 Apr 2026 12:30:55 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 91B2640474; Thu, 16 Apr 2026 12:30:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB8D2C2BCAF; Thu, 16 Apr 2026 12:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776342653; bh=0+upWZt1SQSfIz6OgmfLK1joGZgudnQ2lP+Bv+7s1DM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=aREs4pY9AFWiyPis1yCUHi655kH6F2cmateO3OS3vwiWh4XGstegazkXh9fTeJRQW F7PNlGo+5uv4JS1ghUA7GmLt/nGdKTIiz0N3eNo0k9qdgxnlZ6UVo1xvuY/jm0Jsgz 6OXZlHvLM95FlzgQqthFFGhbIejPY5s4jQOos8SHiaMv+4GNWDNJ4NBjKmastJKLl9 B+kLcT7cwceOa9aKNihg3CZG+65E3BtgCcBvAVf5SIS4E47zAqVB8uUKfjkayyutdK 0Jj6v6r/4toyxe6BrveBQ3dEYq/LaiTL2nhXiDsBmOQK54Y4zcD7qDew9ISAzQHpha d9g1fsIICa3fA== Message-ID: <1fba96bd-124d-431d-8de8-78688c248600@kernel.org> Date: Thu, 16 Apr 2026 14:30:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/61] Coccinelle: Prefer IS_ERR_OR_NULL over manual NULL check To: Philipp Hahn , amd-gfx@lists.freedesktop.org, apparmor@lists.ubuntu.com, bpf@vger.kernel.org, ceph-devel@vger.kernel.org, cocci@inria.fr, dm-devel@lists.linux.dev, dri-devel@lists.freedesktop.org, gfs2@lists.linux.dev, intel-gfx@lists.freedesktop.org, intel-wired-lan@lists.osuosl.org, iommu@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-clk@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, linux-media@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-mtd@lists.infradead.org, linux-nfs@vger.kernel.org, linux-omap@vger.kernel.org, linux-phy@lists.infradead.org, linux-pm@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-sctp@vger.kernel.org, linux-security-module@vger.kernel.org, linux-sh@vger.kernel.org, linux-sound@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-trace-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, samba-technical@lists.samba.org, sched-ext@lists.linux.dev, target-devel@vger.kernel.org, tipc-discussion@lists.sourceforge.net, v9fs@lists.linux.dev Cc: Julia Lawall , Nicolas Palix References: <20260310-b4-is_err_or_null-v1-0-bd63b656022d@avm.de> <20260310-b4-is_err_or_null-v1-1-bd63b656022d@avm.de> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On 10/03/2026 12:48, Philipp Hahn wrote: > Find and convert uses of IS_ERR() plus NULL check to IS_ERR_OR_NULL(). > > There are several cases where `!ptr && WARN_ON[_ONCE](IS_ERR(ptr))` is > used: > - arch/x86/kernel/callthunks.c:215 WARN_ON_ONCE > - drivers/clk/clk.c:4561 WARN_ON_ONCE > - drivers/interconnect/core.c:793 WARN_ON > - drivers/reset/core.c:718 WARN_ON > The change is not 100% semantical equivalent as the warning will now > also happen when the pointer is NULL. > > To: Julia Lawall > To: Nicolas Palix > Cc: cocci@inria.fr > Cc: linux-kernel@vger.kernel.org > > --- > drivers/clocksource/mips-gic-timer.c:283 looks suspicious: ret != clk, > but Daniel Lezcano verified it as cottect. > > There are some cases where the checks are part of a larger expression: > - mm/kmemleak.c:1095 > - mm/kmemleak.c:1155 > - mm/kmemleak.c:1173 > - mm/kmemleak.c:1290 > - mm/kmemleak.c:1328 > - mm/kmemleak.c:1241 > - mm/kmemleak.c:1310 > - mm/kmemleak.c:1258 > - net/netlink/af_netlink.c:2670 > Thanks to Julia Lawall for the help to also handle them. > > Signed-off-by: Philipp Hahn > --- > scripts/coccinelle/api/is_err_or_null.cocci | 125 ++++++++++++++++++++++++++++ > 1 file changed, 125 insertions(+) > Neither this, nor try from 2011, nor any future try should be accepted, because it creates impression IS_ERR_OR_NULL is somehow okay. No, it is not okay, it is a discouraged pattern leading to less readable and maintainable code. We should not have therefore any tools suggesting usage of IS_ERR_OR_NULL, because people will be converting poor code into that, instead of fixing that poor code. Best regards, Krzysztof -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy