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 9781E351FDB; Fri, 21 Nov 2025 13:54:55 +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=1763733295; cv=none; b=qbQebh17uzCl1LKqYOygynEvYL/kNYDYN4mXmcE4SOgDild1Mg70I+7lKf9V1YjN3yR7Npu0MEmw7y3S20u/YxC5BCPJ3civJgC8dZrcRQ9O0WhRADs+fsE7/UkCFGqpu6B7asaRAPsYp4N+1yV4sJlCrn792NarLOBS9YBZPnY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763733295; c=relaxed/simple; bh=9ONQtvdy1W/XoRrE2ziDKfLGDILlCbIXmPpA6zNHdsw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=W9toLDgdphov4oGjDVCGMUBkys9n7ny+FoVyFA1TcRIIaui4BHkyyLzGi95ysTacG4/jQIc8ONn54TA1PbFJUnohVFlRSnlaq4XQ8+ogYXiNUrudxyRZSArp6yNQ7XOPj9pnMnqQfJ+x9dpkHZ+631xRWOT8JR5LI0Ha99FMyjE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Cn2pS30g; 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="Cn2pS30g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E590C116C6; Fri, 21 Nov 2025 13:54:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1763733295; bh=9ONQtvdy1W/XoRrE2ziDKfLGDILlCbIXmPpA6zNHdsw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cn2pS30gkcEJ8cO2Xtb9WBR/PAqOoOsGmn+mtLKlqi1OU+doB1lHT9MBeKxDn76wI pwso2viSWpCFGryXkoK2K01e6RCrkLfYNPlI9XGXE0qpbXejFeTAu7NtBKsWDkaj+I /CXpIr34f80+u8pAed4V7mMhoPsYfJAh9RWQvFUQ= 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 6.6 418/529] ACPI: CPPC: Check _CPC validity for only the online CPUs Date: Fri, 21 Nov 2025 14:11:57 +0100 Message-ID: <20251121130245.890266795@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251121130230.985163914@linuxfoundation.org> References: <20251121130230.985163914@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-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 10d531427ba77..39f248be9611f 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -445,7 +445,7 @@ 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