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From: KyongHo Cho <pullip.cho@samsung.com>
Subject: [PATCH] mm: simple approach to calculate combined index of adjacent buddy lists
Date: Wed, 22 Dec 2010 22:26:52 +0900
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The previous approach of calucation of combined index was

page_idx & ~(1 << order))

but we have same result with

page_idx & buddy_idx