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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81FACC4332F for ; Mon, 8 Nov 2021 10:16:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6030A611C4 for ; Mon, 8 Nov 2021 10:16:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238961AbhKHKST (ORCPT ); Mon, 8 Nov 2021 05:18:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238568AbhKHKPL (ORCPT ); Mon, 8 Nov 2021 05:15:11 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7DB0CC0613F5; Mon, 8 Nov 2021 02:12:25 -0800 (PST) Received: from zn.tnic (p200300ec2f33110088892b77bd117736.dip0.t-ipconnect.de [IPv6:2003:ec:2f33:1100:8889:2b77:bd11:7736]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 12E011EC0505; Mon, 8 Nov 2021 11:12:24 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1636366344; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dsN1KahJp/YRuwxssCUwC9tC2Gq1F8xatSCed4RDYK0=; b=XW0S8cGQlrUU7Sx4YYUUqYSl7rK+m1lQDApwNyNOhVz6vrJu/e7+P4U1bGfGXbfHMVDyXN Y8uAm5IJGhwoL4KDkc5TRE4CoSj0W1pCSeycHBn8vysOxc6YxxtvwQL1VenFJAU2VP+i1j f/aiTSo1F8b3Zq+KdJ76uCjinG24up4= From: Borislav Petkov To: LKML Cc: rcu@vger.kernel.org Subject: [PATCH v0 20/42] rcu: Check notifier registration return value Date: Mon, 8 Nov 2021 11:11:35 +0100 Message-Id: <20211108101157.15189-21-bp@alien8.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20211108101157.15189-1-bp@alien8.de> References: <20211108101157.15189-1-bp@alien8.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Borislav Petkov Avoid homegrown notifier registration checks. No functional changes. Signed-off-by: Borislav Petkov Cc: rcu@vger.kernel.org --- kernel/rcu/tree_stall.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index 5e2fa6fd97f1..0c1d631214f4 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -101,7 +101,9 @@ static struct notifier_block rcu_panic_block = { static int __init check_cpu_stall_init(void) { - atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block); + if (atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block)) + pr_warn("RCU warning suppress notifier already registered\n"); + return 0; } early_initcall(check_cpu_stall_init); -- 2.29.2