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[2620:137:e000::1:20]) by mx.google.com with ESMTP id v16-20020a056402185000b004acdef7baa9si15490500edy.522.2023.02.23.11.13.10; Thu, 23 Feb 2023 11:13:34 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@bytedance.com header.s=google header.b=V7OoY+Xk; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=bytedance.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231991AbjBWTMj (ORCPT + 99 others); Thu, 23 Feb 2023 14:12:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231695AbjBWTMa (ORCPT ); Thu, 23 Feb 2023 14:12:30 -0500 Received: from mail-wr1-x42b.google.com (mail-wr1-x42b.google.com [IPv6:2a00:1450:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 97FFA56521 for ; Thu, 23 Feb 2023 11:12:06 -0800 (PST) Received: by mail-wr1-x42b.google.com with SMTP id p8so11689029wrt.12 for ; Thu, 23 Feb 2023 11:12:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; 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=7yne835l8M0Qgk6uaQXrJLgxrNefMQSePYhKpKknocM=; b=V7OoY+Xkb1vzkS5nj+lYutSsnw1LLzyIz6O92ioTe4bcq67o38+hPJ+XTpkDTM3bx+ pcuZkF8TIS5mtmNsNeKwBd/4jBIuSnQAu79D9emHf5V2xG4utkfDG478Jz9txH4BVwwH UovpWvDcaLRxN6Si7ssBQMsqY8iMmhB0ZlhOsaLjGFoRk/pDnp8kxjtVxEnAb3v9rMm6 WrvS03lvV2I84wKNfON28EiIXpS5n2cwPIsjNToKGkr4cssGxeHmd7ijVPfpCYGyHATD u/QUatv6Xxkd0zj9CH/ixQO4vyC2tknuYhgwhKszsJWW7IaKfzW8NQA9cpIAcLA1QtuF 9RfA== 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=7yne835l8M0Qgk6uaQXrJLgxrNefMQSePYhKpKknocM=; b=uVVYjyY0NMaAL6wuNwfAKFxmRHXWqL6VjMT/NcTMf6wRUo6sQAUvhG9QV14yh4Fyrd n7N3YtHKGD1GIrNwK+QrwH572FWhqm9+C5MgV2IZFwky9gUjO81AkXU2BQuwMYWIm6aF D2Bu8bEe78HZ7r1nsPo/zAnqRu6BMKlGWmvpcNjXYaTp0G15jsga5YwpNc1cu+ErtT9l TU7vqNe2ozs+7xC2sr9dQCOuTZXfc2BmKluZxlQtlSb5u/OULe9IZgAlWZj8wGMAxeih 8OsBCVjjsu323AtH+vAzxTPvgTbzIDKG1PEOOwxGWnkvok2FmNC37hD1+6OEeTTjBHNf FOvg== X-Gm-Message-State: AO0yUKWQVMhSmjxx/0WIjpOyhVbOLwNHqIgsGRWctBbVh+Pp6tevoe9f a1tkIlJLyjm0cHFtjOW7dq9xvA== X-Received: by 2002:a5d:5309:0:b0:2c7:1b6e:5a9c with SMTP id e9-20020a5d5309000000b002c71b6e5a9cmr13124wrv.2.1677179505012; Thu, 23 Feb 2023 11:11:45 -0800 (PST) Received: from usaari01.cust.communityfibre.co.uk ([2a02:6b6a:b566:0:5ee0:5af0:64bd:6198]) by smtp.gmail.com with ESMTPSA id b15-20020a5d4b8f000000b002c561805a4csm12957286wrt.45.2023.02.23.11.11.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Feb 2023 11:11:44 -0800 (PST) From: Usama Arif To: dwmw2@infradead.org, tglx@linutronix.de, kim.phillips@amd.com, brgerst@gmail.com Cc: piotrgorski@cachyos.org, oleksandr@natalenko.name, 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 v11 02/12] cpu/hotplug: Move idle_thread_get() to Date: Thu, 23 Feb 2023 19:11:30 +0000 Message-Id: <20230223191140.4155012-3-usama.arif@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230223191140.4155012-1-usama.arif@bytedance.com> References: <20230223191140.4155012-1-usama.arif@bytedance.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1758650291292417752?= X-GMAIL-MSGID: =?utf-8?q?1758650291292417752?= 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 Tested-by: Paul E. McKenney Tested-by: Kim Phillips Tested-by: Oleksandr Natalenko --- 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