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Date: Fri, 4 Jan 2013 17:10:50 +0800 From: Lin Feng <linfeng@...fujitsu.com> To: akpm@...ux-foundation.org, tj@...nel.org Cc: mingo@...nel.org, yinghai@...nel.org, liwanp@...ux.vnet.ibm.com, benh@...nel.crashing.org, tangchen@...fujitsu.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Lin Feng <linfeng@...fujitsu.com> Subject: [RFC PATCH] mm: memblock: fix wrong memmove size in memblock_merge_regions() The memmove span covers from (next+1) to the end of the array, and the index of next is (i+1), so the index of (next+1) is (i+2). So the size of remaining array elements is (type->cnt - (i + 2)). PS. It seems that memblock_merge_regions() could be made some improvement: we need't memmove the remaining array elements until we find a none-mergable element, but now we memmove everytime we find a neighboring compatible region. I'm not sure if the trial is worth though. Cc: Tejun Heo <tj@...nel.org> Signed-off-by: Lin Feng <linfeng@...fujitsu.com> --- mm/memblock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memblock.c b/mm/memblock.c index 6259055..85ce056 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -314,7 +314,7 @@ static void __init_memblock memblock_merge_regions(struct memblock_type *type) } this->size += next->size; - memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next)); + memmove(next, next + 1, (type->cnt - (i + 2)) * sizeof(*next)); type->cnt--; } } -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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