From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx116.postini.com [74.125.245.116]) by kanga.kvack.org (Postfix) with SMTP id 096A76B003C for ; Tue, 27 Aug 2013 05:39:16 -0400 (EDT) From: Tang Chen Subject: [PATCH 07/11] x86, memblock: Set lowest limit for memblock_alloc_base_nid(). Date: Tue, 27 Aug 2013 17:37:44 +0800 Message-Id: <1377596268-31552-8-git-send-email-tangchen@cn.fujitsu.com> In-Reply-To: <1377596268-31552-1-git-send-email-tangchen@cn.fujitsu.com> References: <1377596268-31552-1-git-send-email-tangchen@cn.fujitsu.com> Sender: owner-linux-mm@kvack.org List-ID: To: rjw@sisk.pl, lenb@kernel.org, tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com, akpm@linux-foundation.org, tj@kernel.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 Cc: x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-acpi@vger.kernel.org memblock_alloc_base_nid() is a common API of memblock. And it calls memblock_find_in_range_node() with %start = 0, which means it has no limit for the lowest address by default. memblock_find_in_range_node(0, max_addr, size, align, nid); Since we introduced current_limit_low to memblock, if we have no limit for the lowest address or we are not sure, we should pass MEMBLOCK_ALLOC_ACCESSIBLE to %start so that it will be limited by the default low limit. dma_contiguous_reserve() and setup_log_buf() will eventually call memblock_alloc_base_nid() to allocate memory. So if the allocation order is from low to high, they will allocate memory from the lowest limit to higher memory. Signed-off-by: Tang Chen Reviewed-by: Zhang Yanfei --- mm/memblock.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/mm/memblock.c b/mm/memblock.c index 961d4a5..be8c4d1 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -851,7 +851,8 @@ static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size, /* align @size to avoid excessive fragmentation on reserved array */ size = round_up(size, align); - found = memblock_find_in_range_node(0, max_addr, size, align, nid); + found = memblock_find_in_range_node(MEMBLOCK_ALLOC_ACCESSIBLE, + max_addr, size, align, nid); if (found && !memblock_reserve(found, size)) return found; -- 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