From patchwork Tue Nov 21 13:44:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King \(Oracle\)" X-Patchwork-Id: 745744 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="aK8Z+bb3" Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65BA4D7F; Tue, 21 Nov 2023 05:44:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=NBEBqsxRM69zEZyAIr1RVA2X5y0uA8ns6dIxJb5hWFo=; b=aK8Z+bb3TgcPd5wkyjOnWMdsUr CR/23xnuLXKcjxCRbrdd3D+ewu78B0gPfphwNcz1QIjrxiuoV0Ato8p1rSqUHB0MPsaEpBMouQIqn xly3fPxymctQzSay2+f3oSgBodJsMNPMuryRSWF1zC3cDYTy62Mf76oQiEpNO+9TQY8igbZTcGDhT gR6VtecfEH6lEtdyDkvGiPbIaEhtwWcpWrRCzCythPNCZEbbKOQ1f/q0IT1yfpQBJxGagkSAlpWJw 5TDxfPuFa+CKCDW2mbEddGk68g3+cZdPuhz9g3Kprk+hRGMOxntNOrNR12GV5oMW+1v4tMF+ufpUc mvEc6SDQ==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:44202 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1r5R3K-00077s-1d; Tue, 21 Nov 2023 13:44:34 +0000 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1r5R3H-00CszC-2n; Tue, 21 Nov 2023 13:44:31 +0000 In-Reply-To: References: From: Russell King (Oracle) To: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, linux-csky@vger.kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org Cc: Salil Mehta , Jean-Philippe Brucker , jianyong.wu@arm.com, justin.he@arm.com, James Morse , Greg Kroah-Hartman , "Rafael J. Wysocki" , Paul Walmsley , Palmer Dabbelt , Albert Ou Subject: [PATCH 08/21] drivers: base: Implement weak arch_unregister_cpu() Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline Message-Id: Sender: Russell King Date: Tue, 21 Nov 2023 13:44:31 +0000 From: James Morse Add arch_unregister_cpu() to allow the ACPI machinery to call unregister_cpu(). This is enough for arm64, riscv and loongarch, but needs to be overridden by x86 and ia64 who need to do more work. CC: Jean-Philippe Brucker Signed-off-by: James Morse Reviewed-by: Shaoqin Huang Signed-off-by: Russell King (Oracle) Reviewed-by: Jonathan Cameron Reviewed-by: Gavin Shan --- An open question remains from the RFC v2 posting: should we provide a __weak stub for !HOTPLUG_CPU as well, since in later patches ACPI may reference this if the compiler doesn't optimise as we expect? Changes since v1: * Added CONFIG_HOTPLUG_CPU ifdeffery around unregister_cpu Changes since RFC v2: * Move earlier in the series --- drivers/base/cpu.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 579064fda97b..58bb86091b34 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -531,7 +531,14 @@ int __weak arch_register_cpu(int cpu) { return register_cpu(&per_cpu(cpu_devices, cpu), cpu); } -#endif + +#ifdef CONFIG_HOTPLUG_CPU +void __weak arch_unregister_cpu(int num) +{ + unregister_cpu(&per_cpu(cpu_devices, num)); +} +#endif /* CONFIG_HOTPLUG_CPU */ +#endif /* CONFIG_GENERIC_CPU_DEVICES */ static void __init cpu_dev_register_generic(void) {