From patchwork Wed Jan 31 16:50:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King \(Oracle\)" X-Patchwork-Id: 768877 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 84A7E12BF2B; Wed, 31 Jan 2024 16:50:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=78.32.30.218 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706719839; cv=none; b=oixgwQb9Rc/sYrMMUAeRKpUexq17M4dLO6RQ/bT1pU3s8U5kAwRPt803EuujHNZ9IiijGUf651uQ3Z/8Kco/TtfrZbD4Wo+xH6R3wWSr5LanpzEWrSJIAUJMyA0l2iMT5Pidj7GqTuXWMF32EVEOa0dv64rsqmNMQiNJAmMwgwI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706719839; c=relaxed/simple; bh=LTKcInkLZgpAbNkbK0w8drlT6huu9tuFRYheHBlt1Jc=; h=In-Reply-To:References:From:To:Cc:Subject:MIME-Version: Content-Disposition:Content-Type:Message-Id:Date; b=gbr5UFHzyf1azJTXMMR30nuMq4hm428iea+Zbga7jIsPKn7BgSt9NVx09OtO37afZ4XHmy9/pr3rUeYZ/iOdCIMHN5WMoQ8lJwwUaZdubMQ5mmicqndgxR4k7Kp0F6W4AZwgfqWs+rgPZ2Kr+dFeCJYiGkZoaGudeTWyuIKOteI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk; spf=none smtp.mailfrom=armlinux.org.uk; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b=e402SKqu; arc=none smtp.client-ip=78.32.30.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="e402SKqu" 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=mdSd4VjdwbsxcclalIflVyksZpCV5Xk/AHrd3gBtdjo=; b=e402SKqul6WttNElDpt+AMqLqX x5jFKIDt16+QHzeRcqYmGOGubS8UMfgDN8bqP8nRmaTrvxRputq4yO6pL5OHcCuSqCXnfdOrjY3HL rcFLlXSeAg091rFK4UF8JARMuJ9OJtXC1A900zRsHvmECXurcRfn5kFqlEG+gvWDEIdcvmLm6bxjb 4bKtCvb/89L8ei0lw2/3mQj1ZaTuf62+Hsakf63GllIIY5xxoC28hjayNYOZ/Ay5wPHUrOrElC9JE agxW5DNqjrp0Fhvwl+8QXDUKNJiDOEC34v0aY4QKF6yMEXRzTzpzOQCd4jTFjspgERReOcVa20Mb/ bsPodYFQ==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:35774 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 1rVDn3-0003V0-2w; Wed, 31 Jan 2024 16:50:22 +0000 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1rVDmz-0027Yz-GE; Wed, 31 Jan 2024 16:50:17 +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, acpica-devel@lists.linuxfoundation.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 , Jonathan Cameron , "Rafael J. Wysocki" Subject: [PATCH RFC v4 08/15] ACPI: Warn when the present bit changes but the feature is not enabled 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: Wed, 31 Jan 2024 16:50:17 +0000 From: James Morse ACPI firmware can trigger the events to add and remove CPUs, but the OS may not support this. Print an error message when this happens. This gives early warning on arm64 systems that don't support CONFIG_ACPI_HOTPLUG_PRESENT_CPU, as making CPUs not present has side effects for other parts of the system. Signed-off-by: James Morse Reviewed-by: Jonathan Cameron Reviewed-by: Gavin Shan Tested-by: Miguel Luis Tested-by: Vishnu Pajjuri Tested-by: Jianyong Wu Signed-off-by: Russell King (Oracle) --- Changes since RFC v2: * Update commit message with suggestion from Gavin Shan --- drivers/acpi/acpi_processor.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 77d47e6c2474..d1d33e74216c 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -189,8 +189,10 @@ static int acpi_processor_make_present(struct acpi_processor *pr) acpi_status status; int ret; - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_CPU)) + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_CPU)) { + pr_err_once("Changing CPU present bit is not supported\n"); return -ENODEV; + } if (invalid_phys_cpuid(pr->phys_id)) return -ENODEV; @@ -462,8 +464,10 @@ static void acpi_processor_make_not_present(struct acpi_device *device) { struct acpi_processor *pr; - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_CPU)) + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_CPU)) { + pr_err_once("Changing CPU present bit is not supported"); return; + } pr = acpi_driver_data(device); if (pr->id >= nr_cpu_ids)