linux-kernel - [RFC PATCH 22/23 V2] memblock: compare current_limit with end variable at memblock_find_in_range

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Date:	Thu, 2 Aug 2012 14:01:27 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org
Cc:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	Yinghai Lu <yinghai@...nel.org>, linux-mm@...ck.org
Subject: [RFC PATCH 22/23 V2] memblock: compare current_limit with end variable at memblock_find_in_range_node()

From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

memblock_find_in_range_node() does not compare memblock.current_limit
with end variable. Thus even if memblock.current_limit is smaller than
end variable, the function allocates memory address that is bigger than
memblock.current_limit.

The patch adds the check to "memblock_find_in_range_node()"

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 mm/memblock.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 663b805..ce7fcb6 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -99,11 +99,12 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
 					phys_addr_t align, int nid)
 {
 	phys_addr_t this_start, this_end, cand;
+	phys_addr_t current_limit = memblock.current_limit;
 	u64 i;
 
 	/* pump up @end */
-	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
-		end = memblock.current_limit;
+	if ((end == MEMBLOCK_ALLOC_ACCESSIBLE) || (end > current_limit))
+		end = current_limit;
 
 	/* avoid allocating the first page */
 	start = max_t(phys_addr_t, start, PAGE_SIZE);
-- 
1.7.1

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