From patchwork Wed Feb 15 14:54:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Usama Arif X-Patchwork-Id: 13141760 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D34CC636CC for ; Wed, 15 Feb 2023 14:54:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229940AbjBOOyh (ORCPT ); Wed, 15 Feb 2023 09:54:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50574 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229934AbjBOOyg (ORCPT ); Wed, 15 Feb 2023 09:54:36 -0500 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5710E39BBE for ; Wed, 15 Feb 2023 06:54:32 -0800 (PST) Received: by mail-wr1-x436.google.com with SMTP id r2so19423087wrv.7 for ; Wed, 15 Feb 2023 06:54:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=XKydoXD7DOLwoETiq1rVpdNfhGCr3/VFLGt4p4rSeXA=; b=hceQhhwWr1f7FagWsyZzNcBZmbVIP5OsxIHYJcXaYD/J/Q7I26e/dUdp/xuuGbSkQJ Z1qGwNRkGt4p30gy8YpfDwILmLyxZrlBX3CqoFXhW43tR/dxW9GDDPsibinx4GROooJ6 a6+ZWH74IaiAVz2y8cQC+aCaZcHFQLiKSORlFpff73D24PLDeJqCV16qvlFJGrkDEbov AMZWZo413nAzLPloJj5ZR331G+o2Zx5YzVKTb7Z5q4MnJbG0HOeYJWqo7D2qTlV/TLTv eNvlpQ1C/saz9isQ7J0rdwzMfVDOeplNT4Gg3Ee2AqBJ58LccYbudMPLhF9tm2KFukOS xrbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=XKydoXD7DOLwoETiq1rVpdNfhGCr3/VFLGt4p4rSeXA=; b=CvzVq9ij8PXp74SUGCpgirzAQEMq3Ph+BnX31ujXAqVj9fZ83awgXJ0tr9oS50A11/ R2Rf1h0z9RZ9HzqLAtL/HINOc9UDXjnT1a8CudmHgLHtPfE2ualMjb+KSWdMLW2zBuiF hG/oMq7uUlEgaGYAuZNVaAv2W9V+6FMPjx4IQFPP4kVLpuPOrSYg0dnVNwOAGkArUzVr KnD9rjYka6j8DSPBT4OzAsjtjxOpoj2oMJtesewSq910Djz3XrEJS0CxisYnYG9RyfER 3wO2Z+cORx2sqDdSL6KuVvveuwGI29Sm9hcDMqBr52q1MISTy686sQJnRhYJkAYIVex+ qiNg== X-Gm-Message-State: AO0yUKVyG0CBAhklDy7yvlJ8Lvp/SUWS4Die2sskNd5erhDvSlArV8uk LV1i2WPv7YZ0TZ9I6qzcknyPNA== X-Google-Smtp-Source: AK7set860Rew0tYEOZBESqpmpyGt2v7Hl1tSKNM8QidgJEbU+BU+JoCxhBj+fZDORe++V3Ea+1V2NQ== X-Received: by 2002:a5d:6448:0:b0:2c5:581d:5a1d with SMTP id d8-20020a5d6448000000b002c5581d5a1dmr1567680wrw.43.1676472870810; Wed, 15 Feb 2023 06:54:30 -0800 (PST) Received: from usaari01.cust.communityfibre.co.uk ([2a02:6b6a:b566:0:8487:6a9a:3a67:11aa]) by smtp.gmail.com with ESMTPSA id t13-20020adfe44d000000b002c557f82e27sm8495508wrm.99.2023.02.15.06.54.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Feb 2023 06:54:30 -0800 (PST) From: Usama Arif To: dwmw2@infradead.org, tglx@linutronix.de, kim.phillips@amd.com Cc: arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de, fam.zheng@bytedance.com, punit.agrawal@bytedance.com, simon.evans@bytedance.com, liangma@liangbit.com, David Woodhouse , Usama Arif Subject: [PATCH v9 2/8] cpu/hotplug: Move idle_thread_get() to Date: Wed, 15 Feb 2023 14:54:19 +0000 Message-Id: <20230215145425.420125-3-usama.arif@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230215145425.420125-1-usama.arif@bytedance.com> References: <20230215145425.420125-1-usama.arif@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: David Woodhouse Instead of relying purely on the special-case wrapper in bringup_cpu() to pass the idle thread to __cpu_up(), expose idle_thread_get() so that the architecture code can obtain it directly when necessary. This will be useful when the existing __cpu_up() is split into multiple phases, only *one* of which will actually need the idle thread. If the architecture code is to register its new pre-bringup states with the cpuhp core, having a special-case wrapper to pass extra arguments is non-trivial and it's easier just to let the arch register its function pointer to be invoked with the standard API. Signed-off-by: David Woodhouse Reviewed-by: Thomas Gleixner Signed-off-by: Usama Arif --- include/linux/smpboot.h | 7 +++++++ kernel/smpboot.h | 2 -- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/linux/smpboot.h b/include/linux/smpboot.h index 9d1bc65d226c..3862addcaa34 100644 --- a/include/linux/smpboot.h +++ b/include/linux/smpboot.h @@ -5,6 +5,13 @@ #include struct task_struct; + +#ifdef CONFIG_GENERIC_SMP_IDLE_THREAD +struct task_struct *idle_thread_get(unsigned int cpu); +#else +static inline struct task_struct *idle_thread_get(unsigned int cpu) { return NULL; } +#endif + /* Cookie handed to the thread_fn*/ struct smpboot_thread_data; diff --git a/kernel/smpboot.h b/kernel/smpboot.h index 34dd3d7ba40b..60c609318ad6 100644 --- a/kernel/smpboot.h +++ b/kernel/smpboot.h @@ -5,11 +5,9 @@ struct task_struct; #ifdef CONFIG_GENERIC_SMP_IDLE_THREAD -struct task_struct *idle_thread_get(unsigned int cpu); void idle_thread_set_boot_cpu(void); void idle_threads_init(void); #else -static inline struct task_struct *idle_thread_get(unsigned int cpu) { return NULL; } static inline void idle_thread_set_boot_cpu(void) { } static inline void idle_threads_init(void) { } #endif