From patchwork Fri May 12 21:07:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13239803 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 DE073C7EE39 for ; Fri, 12 May 2023 21:10:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240462AbjELVKL (ORCPT ); Fri, 12 May 2023 17:10:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240315AbjELVJh (ORCPT ); Fri, 12 May 2023 17:09:37 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7DE3810A19; Fri, 12 May 2023 14:08:12 -0700 (PDT) Message-ID: <20230512205256.690926018@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683925654; 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=/FbhQUaNPV/QmzMYEl0ZGQWeo+zsZNC/fHGpKaYgyVM=; b=sIkpRPZWtZDLRJsNbJqeMaIGrlSPPZQ54swrLTPGjSTFwGmKt9Oaa/S3e7+FMM/zwS3yh1 zBi00At6yibSu1ow+h/o1wevr8Ct+nV3aQorHuUl5ADPJuwBO+bchPZ8ALQZ+kx6i0GW+w zqdpAbyLGX6msZM0R+So0xbvh7Y3sqfgTWEpUi4IiFsYvIytynrP4vP72VrzYLW0n/0gI5 dcjuaB3bMiEaTjpeMR+ijjym0v0KwwT8U989zzsyAvMiMrnZ6zXBcVm77ZsVDRiZB9alDd vSvyAFgEvgFWYPzgBfw025kkJmJ87QGr2kj6vjn8as5Hgwu4BsQPx+xpR6SaPg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683925654; 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=/FbhQUaNPV/QmzMYEl0ZGQWeo+zsZNC/fHGpKaYgyVM=; b=dLO2baNTFk8RA1y+U+P6lN/kShhUhW/oiig8SXDmVflPM4GheqDBwaU3qN83KID4Lvii4k Tfhlc28wF/mJXYCQ== 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 23/37] arm64: smp: Switch to hotplug core state synchronization References: <20230512203426.452963764@linutronix.de> MIME-Version: 1.0 Date: Fri, 12 May 2023 23:07:33 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org From: Thomas Gleixner Switch to the CPU hotplug core state tracking and synchronization mechanim. No functional change intended. Signed-off-by: Thomas Gleixner Tested-by: Mark Rutland Tested-by: Michael Kelley --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/smp.h | 2 +- arch/arm64/kernel/smp.c | 14 +++++--------- 3 files changed, 7 insertions(+), 10 deletions(-) --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -222,6 +222,7 @@ config ARM64 select HAVE_KPROBES select HAVE_KRETPROBES select HAVE_GENERIC_VDSO + select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU select IRQ_DOMAIN select IRQ_FORCED_THREADING select KASAN_VMALLOC if KASAN --- a/arch/arm64/include/asm/smp.h +++ b/arch/arm64/include/asm/smp.h @@ -99,7 +99,7 @@ static inline void arch_send_wakeup_ipi_ extern int __cpu_disable(void); -extern void __cpu_die(unsigned int cpu); +static inline void __cpu_die(unsigned int cpu) { } extern void __noreturn cpu_die(void); extern void __noreturn cpu_die_early(void); --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -332,17 +332,13 @@ static int op_cpu_kill(unsigned int cpu) } /* - * called on the thread which is asking for a CPU to be shutdown - - * waits until shutdown has completed, or it is timed out. + * Called on the thread which is asking for a CPU to be shutdown after the + * shutdown completed. */ -void __cpu_die(unsigned int cpu) +void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { int err; - if (!cpu_wait_death(cpu, 5)) { - pr_crit("CPU%u: cpu didn't die\n", cpu); - return; - } pr_debug("CPU%u: shutdown\n", cpu); /* @@ -369,8 +365,8 @@ void __noreturn cpu_die(void) local_daif_mask(); - /* Tell __cpu_die() that this CPU is now safe to dispose of */ - (void)cpu_report_death(); + /* Tell cpuhp_bp_sync_dead() that this CPU is now safe to dispose of */ + cpuhp_ap_report_dead(); /* * Actually shutdown the CPU. This must never fail. The specific hotplug