Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752379AbdIMJSR (ORCPT ); Wed, 13 Sep 2017 05:18:17 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:37383 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752331AbdIMJSN (ORCPT ); Wed, 13 Sep 2017 05:18:13 -0400 X-IronPort-AV: E=Sophos;i="5.42,387,1500912000"; d="scan'208";a="26075969" From: Dou Liyang To: CC: Dou Liyang , , "Rafael J. Wysocki" , "Zheng, Lv" , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , , Michael Ellerman , Will Deacon , , Tony Luck , Fenghua Yu , , , , Subject: [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier Date: Wed, 13 Sep 2017 17:17:54 +0800 Message-ID: <1505294274-441-1-git-send-email-douly.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1505293975-26005-1-git-send-email-douly.fnst@cn.fujitsu.com> References: <1505293975-26005-1-git-send-email-douly.fnst@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.106] X-yoursite-MailScanner-ID: 4D7EB47CA46F.A5357 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: douly.fnst@cn.fujitsu.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2069 Lines: 61 Linux uses acpi_early_init() to put the ACPI table management into the late stage from the early stage. This two stages are different. the mapped ACPI tables in early stage is temporary and should be unmapped, but in late stage, it is permanent and don't need to be unmapped. Originally, mapping and parsing the DMAR table should be in the late stage. However, Initializing interrupt delivery mode earlier will move it into the early stage. This causes an ACPI error warning when Linux reallocates the ACPI root tables. Commit b064a8fa77df ("ACPI / init: Switch over platform to the ACPI mode later") splits the ACPI early initialization code into acpi_early_init() and acpi_subsystem_init(). This makes acpi_early_init() more independently So, invoke acpi_early_init() earlier before late_time_init(), Keep the DMAR be mapped and parsed in late stage like before. Reported-by: Xiaolong Ye Signed-off-by: Dou Liyang Cc: linux-acpi@vger.kernel.org Cc: Rafael J. Wysocki Cc: Zheng, Lv Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: x86@kernel.org Cc: Michael Ellerman Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: Tony Luck Cc: Fenghua Yu Cc: linux-ia64@vger.kernel.org Cc: yinghai@kernel.org Cc: bhe@redhat.com Cc: bp@alien8.de --- init/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/init/main.c b/init/main.c index 0ee9c686..2fb98a4 100644 --- a/init/main.c +++ b/init/main.c @@ -664,12 +664,12 @@ asmlinkage __visible void __init start_kernel(void) debug_objects_mem_init(); setup_per_cpu_pageset(); numa_policy_init(); + acpi_early_init(); if (late_time_init) late_time_init(); calibrate_delay(); pidmap_init(); anon_vma_init(); - acpi_early_init(); #ifdef CONFIG_X86 if (efi_enabled(EFI_RUNTIME_SERVICES)) efi_enter_virtual_mode(); -- 2.5.5