From patchwork Wed Sep 11 10:07:32 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: tangchen X-Patchwork-Id: 2871851 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C1A379F2D6 for ; Wed, 11 Sep 2013 10:08:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A25DC20163 for ; Wed, 11 Sep 2013 10:07:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E58820120 for ; Wed, 11 Sep 2013 10:07:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753888Ab3IKKH3 (ORCPT ); Wed, 11 Sep 2013 06:07:29 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:42177 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752785Ab3IKKFW (ORCPT ); Wed, 11 Sep 2013 06:05:22 -0400 X-IronPort-AV: E=Sophos;i="4.90,883,1371052800"; d="scan'208";a="8489690" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 11 Sep 2013 18:02:07 +0800 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id r8BA5A6v026453; Wed, 11 Sep 2013 18:05:16 +0800 Received: from G08FNSTD090432.fnst.cn.fujitsu.com ([10.167.226.99]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2013091118025100-1417418 ; Wed, 11 Sep 2013 18:02:51 +0800 From: Tang Chen To: tj@kernel.org, rjw@sisk.pl, lenb@kernel.org, tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com, akpm@linux-foundation.org, trenn@suse.de, yinghai@kernel.org, jiang.liu@huawei.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, izumi.taku@jp.fujitsu.com, mgorman@suse.de, minchan@kernel.org, mina86@mina86.com, gong.chen@linux.intel.com, vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com, riel@redhat.com, jweiner@redhat.com, prarit@redhat.com, zhangyanfei@cn.fujitsu.com, toshi.kani@hp.com Cc: x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-acpi@vger.kernel.org Subject: [PATCH v2 4/9] x86: Support allocate memory from bottom upwards in setup_log_buf(). Date: Wed, 11 Sep 2013 18:07:32 +0800 Message-Id: <1378894057-30946-5-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1378894057-30946-1-git-send-email-tangchen@cn.fujitsu.com> References: <1378894057-30946-1-git-send-email-tangchen@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/09/11 18:02:51, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/09/11 18:02:57, Serialize complete at 2013/09/11 18:02:57 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Spam-Status: No, score=-7.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP During early boot, if the bottom up mode is set, just try allocating bottom up from the end of kernel image, and if that fails, do normal top down allocation. So in function setup_log_buf(), we add the above logic. Signed-off-by: Tang Chen Reviewed-by: Zhang Yanfei --- kernel/printk/printk.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index b4e8500..2958118 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -759,9 +759,20 @@ void __init setup_log_buf(int early) if (early) { unsigned long mem; + if (memblock_direction_bottom_up()) { + mem = memblock_alloc_bottom_up( + MEMBLOCK_ALLOC_ACCESSIBLE, + MEMBLOCK_ALLOC_ACCESSIBLE, + new_log_buf_len, PAGE_SIZE); + if (mem) + goto success; + } + mem = memblock_alloc(new_log_buf_len, PAGE_SIZE); if (!mem) return; + +success: new_log_buf = __va(mem); } else { new_log_buf = alloc_bootmem_nopanic(new_log_buf_len);