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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 1DC4FC0650F for ; Thu, 8 Aug 2019 19:53:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DC3E2218CA for ; Thu, 8 Aug 2019 19:53:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565294002; bh=73AVpHgx7hvxDRDi7Z0/fC6HMg6y1Q9UwJjkg/W9oYA=; h=From:To:Subject:Date:In-Reply-To:References:In-Reply-To: References:List-ID:From; b=A/4/fB+t4X3XZPHuhstCveV4kQn1aCVFG0z5rVaRNcBiQW3WBEpk1PrWjP5Yzs56B q5uQ0Iv65RbzQrzwr5qwgXTKDvIMCSdbf5fSlUMWT6To+m7uWfCp7NgzGiPzaL+es/ a4LnxPn1MdPuX8hrUPM6y9vaQ0mjqb5RyGmsGzLk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404490AbfHHTxU (ORCPT ); Thu, 8 Aug 2019 15:53:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:58054 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404477AbfHHTxS (ORCPT ); Thu, 8 Aug 2019 15:53:18 -0400 Received: from localhost.localdomain (c-98-220-238-81.hsd1.il.comcast.net [98.220.238.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4A69C2189E; Thu, 8 Aug 2019 19:53:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565293998; bh=73AVpHgx7hvxDRDi7Z0/fC6HMg6y1Q9UwJjkg/W9oYA=; h=From:To:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=0Oyl98DroSKmDk8bq8egRVbugDa8qfldToI4dKvq/Mcah4i2U3uEUqgUHqpU8JMFI ZAOnUa5wDZZs1eLsE1sg2B6olnlKQulk0NVqPBrda6WNnO92gfrQFCY45JAKfygnXr z1ei7C+jLtSe12HnrM3EclVt1OgjOHtyESavotOA= From: zanussi@kernel.org To: LKML , linux-rt-users , Steven Rostedt , Thomas Gleixner , Carsten Emde , John Kacur , Sebastian Andrzej Siewior , Daniel Wagner , Tom Zanussi , Julia Cartwright Subject: [PATCH RT 09/19] rcu: Don't allow to change rcu_normal_after_boot on RT Date: Thu, 8 Aug 2019 14:52:37 -0500 Message-Id: <3761f1e54b904b2c8c7ce4132456a72d7ac9978c.1565293934.git.zanussi@kernel.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org From: Sebastian Andrzej Siewior v4.14.137-rt65-rc1 stable review patch. If anyone has any objections, please let me know. ----------- [ Upstream commit c6c058c10577815a2491ce661876cff00a4c3b15 ] On RT rcu_normal_after_boot is enabled by default. Don't allow to disable it on RT because the "expedited rcu" would introduce latency spikes. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Tom Zanussi --- kernel/rcu/update.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 2006a09680aa..307592810f6b 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -67,7 +67,9 @@ module_param(rcu_expedited, int, 0); extern int rcu_normal; /* from sysctl */ module_param(rcu_normal, int, 0); static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT_FULL); +#ifndef CONFIG_PREEMPT_RT_FULL module_param(rcu_normal_after_boot, int, 0); +#endif #endif /* #ifndef CONFIG_TINY_RCU */ #ifdef CONFIG_DEBUG_LOCK_ALLOC -- 2.14.1