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=-12.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 1E80EC433DF for ; Fri, 9 Oct 2020 19:47:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C89D822282 for ; Fri, 9 Oct 2020 19:47:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="B/PrO2PP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732613AbgJITrz (ORCPT ); Fri, 9 Oct 2020 15:47:55 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:52922 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729280AbgJITrz (ORCPT ); Fri, 9 Oct 2020 15:47:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602272874; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc; bh=lgXKGmJY8FuTXCXdpAoSLX4NBWkvEFcm38oteYITDlM=; b=B/PrO2PP8cZgrPiIkUU3nlbGGnHQo87k6YMmSm3fcqgV0rVK20m5IrfThZGhIFXCle82Cx 8xS1KgEG3vfyoyxT/G3FHPMeSvEcbsBAC4+to03y4F6w7ER4OKiQkWVcw9y0e6Jteg2xgF cxou2MHUiuhhO+p8we5y53BmZe9VAyA= Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-372-jpYKowfDPlGdEG6AFjW4ag-1; Fri, 09 Oct 2020 15:47:44 -0400 X-MC-Unique: jpYKowfDPlGdEG6AFjW4ag-1 Received: by mail-oo1-f69.google.com with SMTP id g13so4453243ooo.20 for ; Fri, 09 Oct 2020 12:47:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=lgXKGmJY8FuTXCXdpAoSLX4NBWkvEFcm38oteYITDlM=; b=NNGqYf+C3xCAVDmEA9inCtVo1PcFYLJrNlSgV9oYuec23omPkHfRhtauFYjwaGFz9A 1fTHJ4W9hExGX7q6EJFr3CXIlvLlq1IdNUVqTF6XvcwV6rgVgOlDQ9H9cBERASK5P7Wz lxdGgBQ5niMEYJ53rskG7aWu2nEh7q5ausRocyDlpjVghwZBj75+3BZS4rDpHnjkvv93 /+1lCh21w2l0DkWogwAoEhzhL1BAtnkVmd2O3f8NkaxiXQ+fzzEY2Zoku0AK0FZjwYLY WoAPMByJEsxipNBzpK+AG9saPC7bWbZ+NHkXXdedInJvo8zOVJO1hWt+nH5UTeaV3iE1 e45A== X-Gm-Message-State: AOAM531BnYnPw/UEE4n7/7ioN9CFuj3ScjK/NHXc9D6DOXmk0nLjQhJE Rcl6JV1XyAGASHCJpg/PzOpBpyh2aaU5NCgiY0rEnTHlWsfhGT93lD5XR4BIegSmYFN83O364lU 3dnX/XMrSJm23IAynXuLpdLut X-Received: by 2002:a4a:e08a:: with SMTP id w10mr10404069oos.18.1602272863906; Fri, 09 Oct 2020 12:47:43 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxQflYEfbzuxtLITg+Up9jg2c8kNCLAPz8wTSQCn0w7U0e6jYxqCjicPoPfd05rsY6eO5cFCQ== X-Received: by 2002:a4a:e08a:: with SMTP id w10mr10404056oos.18.1602272863697; Fri, 09 Oct 2020 12:47:43 -0700 (PDT) Received: from trix.remote.csb (075-142-250-213.res.spectrum.com. [75.142.250.213]) by smtp.gmail.com with ESMTPSA id s20sm8164861oot.15.2020.10.09.12.47.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 12:47:43 -0700 (PDT) From: trix@redhat.com To: dave@stgolabs.net, paulmck@kernel.org, josh@joshtriplett.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, joel@joelfernandes.org, natechancellor@gmail.com, ndesaulniers@google.com Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, clang-built-linux@googlegroups.com, Tom Rix Subject: [PATCH] rcutorture: remove unneeded check Date: Fri, 9 Oct 2020 12:47:36 -0700 Message-Id: <20201009194736.2364-1-trix@redhat.com> X-Mailer: git-send-email 2.18.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Rix clang static analysis reports this problem: rcutorture.c:1999:2: warning: Called function pointer is null (null dereference) cur_ops->sync(); /* Later readers see above write. */ ^~~~~~~~~~~~~~~ This is a false positive triggered by an earlier, later ignored NULL check of sync() op. By inspection of the rcu_torture_ops, the sync() op is never uninitialized. So this earlier check is not needed. Signed-off-by: Tom Rix --- kernel/rcu/rcutorture.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index beba9e7963c8..6efc03a1d623 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1989,7 +1989,7 @@ static void rcu_torture_fwd_prog_nr(struct rcu_fwd *rfp, unsigned long stopat; static DEFINE_TORTURE_RANDOM(trs); - if (cur_ops->call && cur_ops->sync && cur_ops->cb_barrier) { + if (cur_ops->call && cur_ops->cb_barrier) { init_rcu_head_on_stack(&fcs.rh); selfpropcb = true; } -- 2.18.1