From patchwork Tue Mar 21 19:40:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Usama Arif X-Patchwork-Id: 13183185 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 0D73BC6FD20 for ; Tue, 21 Mar 2023 19:42:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230444AbjCUTl7 (ORCPT ); Tue, 21 Mar 2023 15:41:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230323AbjCUTlx (ORCPT ); Tue, 21 Mar 2023 15:41:53 -0400 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9E0803B65E for ; Tue, 21 Mar 2023 12:40:46 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id j24so5981689wrd.0 for ; Tue, 21 Mar 2023 12:40:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1679427635; 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=5ygAcJKnTKCTvVciunh9HcyMwipcH5PYmlVu4YEhebA=; b=Iexkp6x3yyHqDDL6OaZInLzZ93bK+l7wJcqEc9pszCs17KfJta9MRhbYNehOvs8q6D XKUaQuZ2obQke50TshqprcQQZw3dKHyHYgWrm/pzzQPvWpEcQSNPXDZHWw0agky2U+ps ogF9bsf4QHdfeveEvlewrX/zdZYyqcFn8X9/RYcrS0ujc35Kmtm0vgw9+o+KtBZvusTh +rf69A/3woBAMVVa67Agt4vUljhc6SgDCXli6nYiJPzMFpu8uKbrQoUXSg+t94/iROyb Bshdjqa2hgalSv9JjLbbPTgXk8fBP+fK4thtjwGtYVs/MJhLRADue+B62bdcQ1MLig72 6IbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679427635; 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=5ygAcJKnTKCTvVciunh9HcyMwipcH5PYmlVu4YEhebA=; b=GaoqfvbxEw3Ncndqxl5U0MP0OIG/rWA846ILLKnaBLDwF5qehALKDgqXYL9E/uWZAn miimJbVH1slRsAj5r1ALGl76AiBMQWMGfqWe8clIGxcIycoHE94fJ35OjZAE8m3w+2SP +8YuUxOdCPskkaYmzwYRiwaVOn+0JOJxQ8aWJEBJQjle+9QHp+Mn98rHLKoSJdcy0//b DchjHab6jHiYQgA7Ca2Z5t9F2HS5G7Fah2vo2EMrBCfVZZ+sZ+qEuVXPLem0jGy6b8F2 wyGXZYsIhhKezlpjzGi+k4xsH5fZg9p3W04E7IrFLNHX0x7fOqJUWqwIqHmG25KO6+xX z5gA== X-Gm-Message-State: AO0yUKVV92C6ezPEM4/ejibvG+onycFBjodpVhtqMGqOX7cOYhq+AgZV e8bm5OrsZZ/tdP6x5RzITAG0Ew== X-Google-Smtp-Source: AK7set9AnDKK/cDv2mIaY0UxRKld6XYgZwnZxOJh6imj92tih6R4SbLItZ1d4sQ/axy5Dygmp0yMFw== X-Received: by 2002:a5d:474d:0:b0:2d4:62ed:e7cf with SMTP id o13-20020a5d474d000000b002d462ede7cfmr3301491wrs.43.1679427635199; Tue, 21 Mar 2023 12:40:35 -0700 (PDT) Received: from usaari01.cust.communityfibre.co.uk ([2a02:6b6a:b566:0:7a8a:d679:ba4e:61cf]) by smtp.gmail.com with ESMTPSA id a3-20020adffb83000000b002c561805a4csm12005026wrr.45.2023.03.21.12.40.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Mar 2023 12:40:34 -0700 (PDT) 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, gpiccoli@igalia.com, David Woodhouse , Usama Arif Subject: [PATCH v16 1/8] cpu/hotplug: Move idle_thread_get() to Date: Tue, 21 Mar 2023 19:40:01 +0000 Message-Id: <20230321194008.785922-2-usama.arif@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230321194008.785922-1-usama.arif@bytedance.com> References: <20230321194008.785922-1-usama.arif@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@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 Tested-by: Paul E. McKenney Tested-by: Kim Phillips Tested-by: Oleksandr Natalenko Tested-by: Guilherme G. Piccoli --- 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