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 C2E48EEEC1C for ; Thu, 1 Jan 2026 22:17:37 +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=KoMmvfhYRIZFGYOO0Tq4CkHWPN7Pe/K/9zLHg9e1FQ8=; b=TQVOg4QiXxV8ZtKbiv2qqn9NYr 3szkx1ORTKR47AOM1Zquc9HuSuXS1uau54g39E1UI2braUf+1mAz/i5Py8dzlnrpQjEBxip5O9uj2 saZY+DEMSDbGrCbz2/uCVjVQm5olA4Ozn8qLkz16gVpNgexprHb/96y+HjGCKyDRVvCuMe3kab1ND UbbEq8/6AefrJVPzrs9hPAg9kdpbAoUjA7OcqoyBPYqso3p3cWAKHtjhMUjPZGuWgDrw0unzcjIYd S+TQz/ZaiC6AYe2iDcJaFn96dCj/VQgp7PVhyt2lIz9CRU58EDMogJBhux+B7kkz/DvTkSmnl1exb oNL9HD0g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vbQyz-00000007YzS-3hxT; Thu, 01 Jan 2026 22:17:30 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vbQyo-00000007YpL-3mwq for linux-arm-kernel@lists.infradead.org; Thu, 01 Jan 2026 22:17:15 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 4A47D60055; Thu, 1 Jan 2026 22:17:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C2F2C116D0; Thu, 1 Jan 2026 22:17:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767305834; bh=STgH3vdgePx/NwxeTPu0LVfQh6HZMobxiXNItthO3G4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jc7gn7TR1w3hwydX3z0B7EcH9rCjv5djOTIhB0+TMcYJdJELjE0CyYpzKA654hMLq hfAROIBc8+V2iNgqs2DbNnrn+tlCRM8nif8NqFp4zKLJWaTGPWsaF+aSyArU8GuV/a oY9NxNLaiyBHWD/IcotLAwtCGDD7HJyMQy1vxXi6MblCVT9rRMhY357N6WUdgqZM40 2eqKe7IgayKiFXlcUJ3THlim3HDHOfKGkYUJFSIBeVHBRTZRZoP551DOU71dUpVa+E r3tV1aztmgSCFiWXB6B8iYBW+Bg6uXBPW2DXRuZRRfDY22u2frlTY3qc9SQEikfzmH 11SsFwxSg4qag== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Chen Ridong , 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 22/33] sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated() Date: Thu, 1 Jan 2026 23:13:47 +0100 Message-ID: <20260101221359.22298-23-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260101221359.22298-1-frederic@kernel.org> References: <20260101221359.22298-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Acked-by: Waiman Long --- 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 d0fb0f647318..dc3975ff1b2e 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -82,8 +82,7 @@ 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 */ -- 2.51.1