From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C154DC4345F for ; Fri, 12 Apr 2024 14:42:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=H8TwkdroAKCRAFgKREilSD6zWLEkMAGuklZGC1ptLOQ=; b=FjU3jkocp2RLY6 E7x9TRcMqkkw8A1sxdu1YUoV8IScSPmOTIqcAtdUzWHfUBYm+6mc6AehlK3sq/R4iyflm4js+mywQ MZk8JCmLRRjeX4NVa0fjWgqFDvYvFpw1vc31YTYru+r2j+q3xmCpu1PHDXPIiBzANd+1OAGy9UQg6 VWt7GWJBdbeKMehulQ4KbrAtdKB4Fp+n4dGiovchKICp3qMXRzI16QqYhQb1T0+4i0rlEH7tsnJPB 81sKcDD06+xjHSBGg3yVZsDxLmpiz7GgWczQYwtBGNdvCQEEWMZbq2KpFQGKcUL8Wp/G+xxFoOXP+ 3WU8E39ax0M2uTTXvUpg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rvI6r-000000002nA-28vs; Fri, 12 Apr 2024 14:42:33 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rvI6n-000000002kR-44ki for linux-arm-kernel@lists.infradead.org; Fri, 12 Apr 2024 14:42:31 +0000 Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4VGK0Y3rFyz6K8wp; Fri, 12 Apr 2024 22:37:33 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id E15E81402CD; Fri, 12 Apr 2024 22:42:23 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Fri, 12 Apr 2024 15:42:23 +0100 From: Jonathan Cameron To: , , , , , , , , Russell King , "Rafael J . Wysocki" , Miguel Luis , James Morse , Salil Mehta , Jean-Philippe Brucker , Catalin Marinas , Will Deacon CC: , , Subject: [PATCH v5 10/18] ACPI: Warn when the present bit changes but the feature is not enabled Date: Fri, 12 Apr 2024 15:37:11 +0100 Message-ID: <20240412143719.11398-11-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240412143719.11398-1-Jonathan.Cameron@huawei.com> References: <20240412143719.11398-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhrpeml500006.china.huawei.com (7.191.161.198) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240412_074230_162561_3536F12C X-CRM114-Status: GOOD ( 13.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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: Gavin Shan Tested-by: Miguel Luis Tested-by: Vishnu Pajjuri Tested-by: Jianyong Wu Signed-off-by: Russell King (Oracle) Signed-off-by: Jonathan Cameron --- v5: No change --- 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 0403eddb3f80..3fb167ee9807 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -187,8 +187,10 @@ static int acpi_processor_make_present(struct acpi_processor *pr) { 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; @@ -466,8 +468,10 @@ 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) -- 2.39.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel