mm/page_alloc.c: simplify calculation of combined index of adjacent buddy lists
commit43506fad21ca3d8dc59e768ff458f7c5e5c01086
authorKyongHo Cho <pullip.cho@samsung.com>
Thu, 13 Jan 2011 23:47:24 +0000 (13 15:47 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 14 Jan 2011 01:32:48 +0000 (13 17:32 -0800)
treeb594f240a780e3547341530fedabb6ac4735ff41
parent5520e89485252c759ee60d313e9422447659947b
mm/page_alloc.c: simplify calculation of combined index of adjacent buddy lists

The previous approach of calucation of combined index was

page_idx & ~(1 << order))

but we have same result with

page_idx & buddy_idx

This reduces instructions slightly as well as enhances readability.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix used-unintialised warning]
Signed-off-by: KyongHo Cho <pullip.cho@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/page_alloc.c