From nobody Thu Apr 2 03:25:22 2026 Received: from mail-dy1-f174.google.com (mail-dy1-f174.google.com [74.125.82.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3D42734C80D for ; Wed, 25 Mar 2026 09:10:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774429814; cv=none; b=a+N1DrzlONu3jnwfcx95pt4NckJVk7YPHOAKl+NVC7XBBYJyZZAwj4IRYVLJH/D7M4+ru9lYTQP1CxOoXPWLHKFX9Msu/fXCqy9m2kSzwQ6A0ptB3m4tFuMVGxnVhreLkh719CHEAjYW5G6XdhHQLahCvDOk1Ql3m5ro+PzIXHE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774429814; c=relaxed/simple; bh=/0ovyB5zfodZHwmFZ8NkbanEJgNkXF5wQsXFoCBPlyA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ETOxrJg78WRtk7Uw7Q9urJgxc727QgWv83ylgtFl/X37of4HlgaOPwckw+LobTLsk8oZ3c0LCBTSFUQbslosi0q8tX/gMmeVO3MBmaiiYCc3ZiXjTp30OBE2IduT8+7bpdsbyPbYkhSJf2FTFAN4GU6q2MUTLBDNidv2xWgVVp8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=QJRBJNlj; arc=none smtp.client-ip=74.125.82.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="QJRBJNlj" Received: by mail-dy1-f174.google.com with SMTP id 5a478bee46e88-2bdcf5970cdso594998eec.0 for ; Wed, 25 Mar 2026 02:10:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774429812; x=1775034612; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=+zwKknmbpTRf8fr0/fDVF5xzUAulDUeqLVmO9Qgf9Ag=; b=QJRBJNlja3cpXbnORXAUKxUiOCbhlmTSfGyK+41eW4pj8HyTyIQo3ly0dyVe5Pv0B9 QKJ8nVoPIDy4nafYnnoQ4D8LIr188nZtCGTpPXL+hh1Cqo/FgC8B6Jj8HbHtI+x25y8j IcjaHO/Ki8en2aZjPjPhr3QGnw3wMRG/OY8JHMAsLhO/MKHrs5QLm1dMeg4VCSSC0H08 m2gaLye5njHj6byGmsUn4DNHQPGq6WOxshHnCWLvjjDcm/gg2oCKtmfSVJo0WpfUnN/7 hg+byW0ZxqijsGwkqxKyHG9TrYVWybBwMTYsVLxv9iZAd3Vss9h75JCsptvJF1AFV6DL wwUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774429812; x=1775034612; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=+zwKknmbpTRf8fr0/fDVF5xzUAulDUeqLVmO9Qgf9Ag=; b=VFUWi6Vm3VnZwPstnx1HyAiibYlOHUNmzdQZfsl20q4HxYfsV+LIQn9vSXL0svctPa ShL484bnFq6cugJjbvarlzYzb1mppfcc9DFgpMywFrew4pp4V1ACGfueOW6uOIIfy60t H8G9jgvdnkX7YUmVKdUZl1fEU0fZkQsCP3grdTzSJu2BwteDo3wA18oFEOtD6zsU5H4h yayyQQTmz4lh2EB1b2ehi/JEmyqLsmkQxl+eAJlktdDXSZZkzAd8+sqSbzxuYva0Qj6T iFG9b5yLRM0sE0TvSYDbAWW0oKGoZmeDPrQA0KvBUStEruZ0DukMIuU+XKv/TLuWvEnb +iGQ== X-Gm-Message-State: AOJu0YxqQ++01/CagINMnSA6jQ1anHXGtaQiR/ygITD42wspniqyJnuN PUzpdjSSCQfGNm89O6akzeBdykEe1og8TEj8UkQdRWEiNWmEjoGtp2Wh X-Gm-Gg: ATEYQzyDvAHk03wKX38oW4nLad2JJBeI4ieWrUrWfQeolhnkl5BVxbYfWVKocFYYAFN sslVrNJhFxljZOPEnBy51Qs4Ko370K3F7E6dW0rrhb4UkeVZX/mUnx4YpP0TcwKnvk8dBg9+oV9 ts3s82TT+RFqU/Q2H6tQkVS2N/fKs3aT1t8TLAakc7xKZt2QFtp4OO0uowvKMIn0egKLYuYrmNV Lfw6IuSHfjeBb+JpYCOOmSEr88QAA1zW0KGKdlzWnsYHvMH4nzXdX1RIoLYCQdUL2vq7ris9XNs Uq5nm6GEPcLwwR4Cqb8lZ02vRhKlLH9M306QYRkrsJFV3Vzch2R/9ydv5f+n5n52kiFXqsSNRW2 8Wc4ZU1pnV7kKQwSBJKpLO24i4GYFxW2hoIfJgVsIh9ZKQmGa69rtN1kz7YDODCFEukTNRgaVnE 38iQ+CGQ/H2LY/qOxE X-Received: by 2002:a05:7300:7fa7:b0:2c0:df3b:ec1e with SMTP id 5a478bee46e88-2c14b58eb90mr2643092eec.11.1774429812245; Wed, 25 Mar 2026 02:10:12 -0700 (PDT) Received: from wujing. ([74.48.213.230]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c159e25dc7sm2786389eec.27.2026.03.25.02.10.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 02:10:11 -0700 (PDT) From: Qiliang Yuan Date: Wed, 25 Mar 2026 17:09:35 +0800 Subject: [PATCH 04/15] genirq: Support dynamic migration for managed interrupts Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260325-dhei-v12-final-v1-4-919cca23cadf@gmail.com> References: <20260325-dhei-v12-final-v1-0-919cca23cadf@gmail.com> In-Reply-To: <20260325-dhei-v12-final-v1-0-919cca23cadf@gmail.com> To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Thomas Gleixner , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Tejun Heo , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Anna-Maria Behnsen , Ingo Molnar , Shuah Khan Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Qiliang Yuan X-Mailer: b4 0.13.0 Managed interrupts currently have their affinity determined once, honoring boot-time isolation settings. There is no mechanism to migrate them when housekeeping boundaries change at runtime. Enable managed interrupts to respond dynamically to housekeeping updates. This ensures that managed interrupts are migrated away from newly isolated CPUs or redistributed when housekeeping CPUs are added. Signed-off-by: Qiliang Yuan --- kernel/irq/manage.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 349ae7979da0e..f2cba3d7ef624 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -2811,3 +2811,52 @@ bool irq_check_status_bit(unsigned int irq, unsigned= int bitmask) return res; } EXPORT_SYMBOL_GPL(irq_check_status_bit); + +#ifdef CONFIG_SMP +static int irq_housekeeping_reconfigure(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct housekeeping_update *upd =3D data; + unsigned int irq; + + if (action !=3D HK_UPDATE_MASK || upd->type !=3D HK_TYPE_MANAGED_IRQ) + return NOTIFY_OK; + + irq_lock_sparse(); + for_each_active_irq(irq) { + struct irq_data *irqd; + struct irq_desc *desc; + + desc =3D irq_to_desc(irq); + if (!desc) + continue; + + scoped_guard(raw_spinlock_irqsave, &desc->lock) { + irqd =3D irq_desc_get_irq_data(desc); + if (!irqd_affinity_is_managed(irqd) || !desc->action || + !irq_data_get_irq_chip(irqd)) + continue; + + /* + * Re-apply existing affinity to honor the new + * housekeeping mask via __irq_set_affinity() logic. + */ + irq_set_affinity_locked(irqd, irq_data_get_affinity_mask(irqd), false); + } + } + irq_unlock_sparse(); + + return NOTIFY_OK; +} + +static struct notifier_block irq_housekeeping_nb =3D { + .notifier_call =3D irq_housekeeping_reconfigure, +}; + +static int __init irq_init_housekeeping_notifier(void) +{ + housekeeping_register_notifier(&irq_housekeeping_nb); + return 0; +} +core_initcall(irq_init_housekeeping_notifier); +#endif --=20 2.43.0