From patchwork Fri May 12 21:07:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13239826 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4BBAEC7EE24 for ; Fri, 12 May 2023 21:18:17 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.534005.831223 (Exim 4.92) (envelope-from ) id 1pxa9G-00044k-IC; Fri, 12 May 2023 21:17:58 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 534005.831223; Fri, 12 May 2023 21:17:58 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pxa9G-00043i-5L; Fri, 12 May 2023 21:17:58 +0000 Received: by outflank-mailman (input) for mailman id 534005; Fri, 12 May 2023 21:17:56 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pxZzB-0004F7-EU for xen-devel@lists.xenproject.org; Fri, 12 May 2023 21:07:33 +0000 Received: from galois.linutronix.de (galois.linutronix.de [193.142.43.55]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 028239f8-f109-11ed-8611-37d641c3527e; Fri, 12 May 2023 23:07:31 +0200 (CEST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 028239f8-f109-11ed-8611-37d641c3527e Message-ID: <20230512205256.582584351@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683925651; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=rBjhgMw+R3T5P7fIX0knHpgERmAnldETzGDcA6m3soI=; b=cbaRZFL8MG+FpoRLi83o8C0jAfcbHTHB+vfFTRdb6Fb5sn0p9lXLPNX7cm2p36LZqMBqmR 1io+Dw1jv1H97vrkFacfHVWEtoGH53aEdX3vz4beRct8h0e0dd26xWSWd8eZW1KCcIJC7Q IQjkl2Ljo3IYhaQRAOEzrdGinOoTCNtqBI4rzplYXNLyGSql4W9oEPvKLwby3cjoIJikik vY7h0DuJoO+oJqXbmBmpR/nMx6mZkS+vKcfhwlFUdevTe78P5zT0sVzDMJyx2aF2BpjVmT 1nL7SZdRWGuShjCMJNYSq1acmRBhEsUAZ4zDDuAqjK77jqt83aYfTHAfG+pL7A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683925651; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=rBjhgMw+R3T5P7fIX0knHpgERmAnldETzGDcA6m3soI=; b=JWEuLlJQJHioUWfttr6TJZop/D83BErX+18Kxt47uf7+fJoL0/b+dnZa33N9Vj8OnGttOs Ptz2z9++OXaZSQCA== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, David Woodhouse , Andrew Cooper , Brian Gerst , Arjan van de Veen , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , Paul Menzel , "Guilherme G. Piccoli" , Piotr Gorski , Usama Arif , Juergen Gross , Boris Ostrovsky , xen-devel@lists.xenproject.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Guo Ren , linux-csky@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Mark Rutland , Sabin Rapan , "Michael Kelley (LINUX)" , Ross Philipson Subject: [patch V4 21/37] cpu/hotplug: Remove cpu_report_state() and related unused cruft References: <20230512203426.452963764@linutronix.de> MIME-Version: 1.0 Date: Fri, 12 May 2023 23:07:30 +0200 (CEST) From: Thomas Gleixner No more users. Signed-off-by: Thomas Gleixner Tested-by: Michael Kelley --- include/linux/cpu.h | 2 - kernel/smpboot.c | 90 ---------------------------------------------------- 2 files changed, 92 deletions(-) --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -184,8 +184,6 @@ void arch_cpu_idle_enter(void); void arch_cpu_idle_exit(void); void __noreturn arch_cpu_idle_dead(void); -int cpu_report_state(int cpu); -int cpu_check_up_prepare(int cpu); void cpu_set_state_online(int cpu); void play_idle_precise(u64 duration_ns, u64 latency_ns); --- a/kernel/smpboot.c +++ b/kernel/smpboot.c @@ -329,97 +329,7 @@ EXPORT_SYMBOL_GPL(smpboot_unregister_per #ifndef CONFIG_HOTPLUG_CORE_SYNC static DEFINE_PER_CPU(atomic_t, cpu_hotplug_state) = ATOMIC_INIT(CPU_POST_DEAD); -/* - * Called to poll specified CPU's state, for example, when waiting for - * a CPU to come online. - */ -int cpu_report_state(int cpu) -{ - return atomic_read(&per_cpu(cpu_hotplug_state, cpu)); -} - -/* - * If CPU has died properly, set its state to CPU_UP_PREPARE and - * return success. Otherwise, return -EBUSY if the CPU died after - * cpu_wait_death() timed out. And yet otherwise again, return -EAGAIN - * if cpu_wait_death() timed out and the CPU still hasn't gotten around - * to dying. In the latter two cases, the CPU might not be set up - * properly, but it is up to the arch-specific code to decide. - * Finally, -EIO indicates an unanticipated problem. - * - * Note that it is permissible to omit this call entirely, as is - * done in architectures that do no CPU-hotplug error checking. - */ -int cpu_check_up_prepare(int cpu) -{ - if (!IS_ENABLED(CONFIG_HOTPLUG_CPU)) { - atomic_set(&per_cpu(cpu_hotplug_state, cpu), CPU_UP_PREPARE); - return 0; - } - - switch (atomic_read(&per_cpu(cpu_hotplug_state, cpu))) { - - case CPU_POST_DEAD: - - /* The CPU died properly, so just start it up again. */ - atomic_set(&per_cpu(cpu_hotplug_state, cpu), CPU_UP_PREPARE); - return 0; - - case CPU_DEAD_FROZEN: - - /* - * Timeout during CPU death, so let caller know. - * The outgoing CPU completed its processing, but after - * cpu_wait_death() timed out and reported the error. The - * caller is free to proceed, in which case the state - * will be reset properly by cpu_set_state_online(). - * Proceeding despite this -EBUSY return makes sense - * for systems where the outgoing CPUs take themselves - * offline, with no post-death manipulation required from - * a surviving CPU. - */ - return -EBUSY; - - case CPU_BROKEN: - - /* - * The most likely reason we got here is that there was - * a timeout during CPU death, and the outgoing CPU never - * did complete its processing. This could happen on - * a virtualized system if the outgoing VCPU gets preempted - * for more than five seconds, and the user attempts to - * immediately online that same CPU. Trying again later - * might return -EBUSY above, hence -EAGAIN. - */ - return -EAGAIN; - - case CPU_UP_PREPARE: - /* - * Timeout while waiting for the CPU to show up. Allow to try - * again later. - */ - return 0; - - default: - - /* Should not happen. Famous last words. */ - return -EIO; - } -} - -/* - * Mark the specified CPU online. - * - * Note that it is permissible to omit this call entirely, as is - * done in architectures that do no CPU-hotplug error checking. - */ -void cpu_set_state_online(int cpu) -{ - (void)atomic_xchg(&per_cpu(cpu_hotplug_state, cpu), CPU_ONLINE); -} - #ifdef CONFIG_HOTPLUG_CPU - /* * Wait for the specified CPU to exit the idle loop and die. */