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 97032CCD183 for ; Mon, 13 Oct 2025 20:34:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Q6xSePBdSAfXbIrbgqNKw5l84lZlag0xzdDLqSYpGok=; b=o2T8Ru4h6DpLKK+KYOrolJMIMx u0Y24SvVFAUZ15aKXiYPRDsmFkVUehFJz2aubcPBuG+uJy8WhJ9q7t+opvPf8lXutsoxTi5YXZ6hG rTGAilnu2JwICCIvxDLxw+lrA4MBKqH+bOSk3/i0Ym+ii3gwyCRcSfICR3Vx58aMPOOwOCRJv1Y3i 9SAw1TR69SCDOME1HhcNXD3rgpVQAxR+lgNbU/x0czor9VBzgIfWZC29DBPr7xn64huwwkXTBTG61 3wIK2bXyeA+n92yE5gl7shEGiVdziZeqiluUUiWsqYVDiNXx61SISVRn5PNKineD/+M++r6Qlykhz 4tclkATg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8PFV-0000000EOm8-2Kto; Mon, 13 Oct 2025 20:34:29 +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 1v8PFS-0000000EOj6-3Dfd for linux-arm-kernel@lists.infradead.org; Mon, 13 Oct 2025 20:34:28 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 12C5C48C0C; Mon, 13 Oct 2025 20:34:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 506C6C4CEE7; Mon, 13 Oct 2025 20:34:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760387665; bh=TsDxN2BInLxMlytlUzRu0aLqwxbBAplotzVpHgLAL/Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vIqfo6Gi5gmdQ7vxGe7RqxhiF87X33Q1XJxWoIlbndC3g6WBMuC8hkzSgerCI62/Q BXhf3bGN2nKsvv6D2OslGLIIzuqA1eL4gsae4q7JMxc0SaZgp03l+SdE7qOD7/+E2O fWv5/7ygc7kJGvfCu94f3nf2F+3QJ/8qFmo7JdAwthJVd6bd/p9jcDjrDAEGdH+EK2 FGTVklbzEtrI2ReuVUwyzc37WdN9ldJnwgNmpzpAoyGWZIKe+ecidj07oosdP8oW6q KxPv1ONdv2Lk2L0qCLRhWjoKzj4jYjx8EZEcRNsktGgBitJCVs7MEegUbPWKt9ME3+ awN/5ogOZslPA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Danilo Krummrich , "David S . Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 19/33] sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated() Date: Mon, 13 Oct 2025 22:31:32 +0200 Message-ID: <20251013203146.10162-20-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251013_133426_853361_560F5F3E X-CRM114-Status: GOOD ( 13.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org It doesn't make sense to use nohz_full without also isolating the related CPUs from the domain topology, either through the use of isolcpus= or cpuset isolated partitions. And now HK_TYPE_DOMAIN includes all kinds of domain isolated CPUs. This means that HK_TYPE_KERNEL_NOISE (of which HK_TYPE_TICK is only an alias) should always be a subset of HK_TYPE_DOMAIN. Therefore if a CPU is not HK_TYPE_DOMAIN, it shouldn't be HK_TYPE_KERNEL_NOISE either. Testing the former is then enough. Simplify cpu_is_isolated() accordingly. Signed-off-by: Frederic Weisbecker --- include/linux/sched/isolation.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index 0f50c152cf68..eef539820de2 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -75,8 +75,7 @@ static inline bool housekeeping_cpu(int cpu, enum hk_type type) static inline bool cpu_is_isolated(int cpu) { - return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) || - !housekeeping_test_cpu(cpu, HK_TYPE_TICK); + return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN); } #endif /* _LINUX_SCHED_ISOLATION_H */ -- 2.51.0