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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 78F92CA9EC7 for ; Tue, 5 Nov 2019 08:13:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5581220869 for ; Tue, 5 Nov 2019 08:13:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387761AbfKEINP (ORCPT ); Tue, 5 Nov 2019 03:13:15 -0500 Received: from imap1.codethink.co.uk ([176.9.8.82]:38216 "EHLO imap1.codethink.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387686AbfKEINP (ORCPT ); Tue, 5 Nov 2019 03:13:15 -0500 Received: from [78.40.148.177] (helo=localhost) by imap1.codethink.co.uk with esmtpsa (Exim 4.84_2 #1 (Debian)) id 1iRtxh-00066H-Js; Tue, 05 Nov 2019 08:13:13 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 05 Nov 2019 08:13:13 +0000 From: Ben Dooks To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org Subject: de-reference of rcu pointers (sparse warnings) Message-ID: X-Sender: ben.dooks@codethink.co.uk User-Agent: Roundcube Webmail/1.3.10 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are a few places in the kenrnel which directly de-reference pointers marked as "noderef" such sa rcu or percpu. In the case of rcu, one example is: kernel/fork.c:2146:32: warning: incorrect type in assignment (different address spaces) kernel/fork.c:2146:32: expected struct task_struct [noderef] *real_parent kernel/fork.c:2146:32: got struct task_struct *task this looks fairly non-trivial to fix given there's a mix of __rcu and non-__rcu attributed variables. Does anyone have an idea how to go about fixing these, if possible? -- Ben