From patchwork Tue Mar 28 19:57:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Usama Arif X-Patchwork-Id: 13191503 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 16FCDC6FD18 for ; Tue, 28 Mar 2023 19:58:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229484AbjC1T6O (ORCPT ); Tue, 28 Mar 2023 15:58:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229554AbjC1T6N (ORCPT ); Tue, 28 Mar 2023 15:58:13 -0400 Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 093A53C25 for ; Tue, 28 Mar 2023 12:58:02 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id l27so13423349wrb.2 for ; Tue, 28 Mar 2023 12:58:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1680033481; 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=PYvh1s2ZCo/2BwztG9fqIEjBvGQeOoHd9NlNhXt+v68=; b=k8IGY8FXbInHectY0rZvxlmn9L+tWhj0zGMBI7O8Ql7u5Z4ceqiRTB2gFHXzX2MGac 11Z1JyFHrbV8fvIa+MAjKzA7iwoBsywMYXQmCkw1YR9M/QCiAyPisYIf4KnzupN1aUem dp8cS3tDEW7nzZxeIPhDTU4ElIXhJxIq0aVNmA02eRT7Ce93WjhGheAezSTwl3W6MPEZ hmsobvHyyWuFgl6GiC+yg1kK6M+/utjCkVtO4wdmAf/UGD63kd09EGWJnfQxbrAt9pmu y6fATlkNrGrpADFnsb/jR/Eo/Qmk8HCJuuDAM+66SjQKUCjmusTD7fvQuvwUhUyXARQk nwPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680033481; 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=PYvh1s2ZCo/2BwztG9fqIEjBvGQeOoHd9NlNhXt+v68=; b=strslaOgKdeIqMONqBPJNx/2UcG4b5sH07OV0AEEbCXGcFJqBM1w0ELXmJuqIBLZH7 cItQKLQwo5NirdapDrlPiXXOVUaAHViOmOUWa3mZ5ArdWXepe9iuFosT4v9HcpLb7wJu DzS0rWqA3+ESMmsdzJa9ApogPDudjYtzmen7EWiapoCaANYF5f0qmhahbhSGdGLLaq8G KNw/YhSnzmoB9UnnmnoVntCoJPQh5ijCyUY006t3zYHMRDRCG63Fp7CkJJokVnLhT/OB Z7mLlFtRe0gsHZBAmjTlqlfyDav2fTEPhHn4cCNiAWjiwdNbFDi6ewtQiJtkFEUcUiyl A1Jw== X-Gm-Message-State: AAQBX9dYsoUQwzYrS+TulIhUQ3MY0nJsEVyjrfSsIJKptLg21hdL9N0t POddk+QZ8z22QOYoAb2aFfWodQ== X-Google-Smtp-Source: AKy350Y5RvAESxe4hLG/sTeNGiybz+f/imU5YRREC5r9As0LNEwIOPdnGUldjcK/izlEsaSCOMvdsg== X-Received: by 2002:adf:f982:0:b0:2d6:5afe:7b99 with SMTP id f2-20020adff982000000b002d65afe7b99mr14282352wrr.10.1680033481472; Tue, 28 Mar 2023 12:58:01 -0700 (PDT) Received: from usaari01.cust.communityfibre.co.uk ([2a02:6b6a:b566:0:8445:3123:91d7:959d]) by smtp.gmail.com with ESMTPSA id z6-20020a056000110600b002c557f82e27sm28248386wrw.99.2023.03.28.12.58.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Mar 2023 12:58:00 -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 , Mark Rutland Subject: [PATCH v17 1/8] cpu/hotplug: Move idle_thread_get() to Date: Tue, 28 Mar 2023 20:57:51 +0100 Message-Id: <20230328195758.1049469-2-usama.arif@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230328195758.1049469-1-usama.arif@bytedance.com> References: <20230328195758.1049469-1-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 Reviewed-by: Mark Rutland Tested-by: Mark Rutland [arm64] --- 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