From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx141.postini.com [74.125.245.141]) by kanga.kvack.org (Postfix) with SMTP id 3CB786B0033 for ; Wed, 11 Sep 2013 06:05:29 -0400 (EDT) From: Tang Chen 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> In-Reply-To: <1378894057-30946-1-git-send-email-tangchen@cn.fujitsu.com> References: <1378894057-30946-1-git-send-email-tangchen@cn.fujitsu.com> Sender: owner-linux-mm@kvack.org List-ID: 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 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); -- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org