From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 779CF272801; Fri, 21 Nov 2025 13:18:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763731095; cv=none; b=UdUymm6dgcjtp/KLeZdM+9LezwnW6+B13ScXFPMOjLUN6NPTU4uK7vNREKLStZI8ItFuGDTUD5NN3JtnocLNkrx0U6G32rIC8IhRRdJ+/XgyBJqY16Jef0cjK9s4UD2VKaiks1WiAPFBO58yX1U9ywTn1mDxKeYpGWI+yhbp5VQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763731095; c=relaxed/simple; bh=/lFxh42tueAl6X+K2QEfZO0+SxMGKyhiWKu5z+NU26Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NT1w4xffC2kCLX/2dY1m71iQqtWFRAQVYabvBTjg8DBYFsDy++q1GHxVnfH8cEdPW7X7l7TelROUrvZqs7SItCbu8JRaKmFEjpOwubSk6eJv5VZqFKiRIHy/ogEtqm4IoKuKfGewFnQlKu4JB2MacnjAmTmJDMJGQXeSdKDQpx0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SgRq5nJ1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="SgRq5nJ1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 02282C4CEF1; Fri, 21 Nov 2025 13:18:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1763731095; bh=/lFxh42tueAl6X+K2QEfZO0+SxMGKyhiWKu5z+NU26Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SgRq5nJ1My/HiY7nCAUzOiN6URSMOghEEKD1jMFxIjKUUyelq8K8CwS82TGakCF6/ 1gqMsoeR5ftDKqNdUjW4l8VlzU1/hEtZEqjFQayfHai5kzbbgSvzYWB1YYsAfBCNjn IY/6Ed8EFZz/ooFA8qDg9hgfrZi9FmM3TYm8x4wQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christopher Harris , Mario Limonciello , "Mario Limonciello (AMD) (kernel.org)" , "Gautham R. Shenoy" , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 6.17 089/247] ACPI: CPPC: Check _CPC validity for only the online CPUs Date: Fri, 21 Nov 2025 14:10:36 +0100 Message-ID: <20251121130157.788209922@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251121130154.587656062@linuxfoundation.org> References: <20251121130154.587656062@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Gautham R. Shenoy [ Upstream commit 6dd3b8a709a130a4d55c866af9804c81b8486d28 ] per_cpu(cpc_desc_ptr, cpu) object is initialized for only the online CPUs via acpi_soft_cpu_online() --> __acpi_processor_start() --> acpi_cppc_processor_probe(). However the function acpi_cpc_valid() checks for the validity of the _CPC object for all the present CPUs. This breaks when the kernel is booted with "nosmt=force". Hence check the validity of the _CPC objects of only the online CPUs. Fixes: 2aeca6bd0277 ("ACPI: CPPC: Check present CPUs for determining _CPC is valid") Reported-by: Christopher Harris Closes: https://lore.kernel.org/lkml/CAM+eXpdDT7KjLV0AxEwOLkSJ2QtrsvGvjA2cCHvt1d0k2_C4Cw@mail.gmail.com/ Suggested-by: Mario Limonciello Reviewed-by: "Mario Limonciello (AMD) (kernel.org)" Tested-by: Chrisopher Harris Signed-off-by: Gautham R. Shenoy Link: https://patch.msgid.link/20251107074145.2340-3-gautham.shenoy@amd.com Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/acpi/cppc_acpi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 6b649031808f8..6694412a1e139 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -460,7 +460,7 @@ bool acpi_cpc_valid(void) if (acpi_disabled) return false; - for_each_present_cpu(cpu) { + for_each_online_cpu(cpu) { cpc_ptr = per_cpu(cpc_desc_ptr, cpu); if (!cpc_ptr) return false; -- 2.51.0