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Date: Tue, 05 May 2009 22:26:38 +0100
From: David Howells <dhowells@...hat.com>
To: torvalds@...l.org, akpm@...ux-foundation.org, npiggin@...e.de
Cc: gerg@...pgear.com, linux-kernel@...r.kernel.org,
David Howells <dhowells@...hat.com>
Subject: [PATCH 1/3] Use roundown_pow_of_two() in zone_batchsize()
Use roundown_pow_of_two(N) in zone_batchsize() rather than (1 << (fls(N)-1))
as they are equivalent, and with the former it is easier to see what is going
on.
Signed-off-by: David Howells <dhowells@...hat.com>
Tested-by: Lanttor Guo <lanttor.guo@...escale.com>
---
mm/page_alloc.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e2f2699..8add7da 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2706,7 +2706,7 @@ static int zone_batchsize(struct zone *zone)
* of pages of one half of the possible page colors
* and the other with pages of the other colors.
*/
- batch = (1 << (fls(batch + batch/2)-1)) - 1;
+ batch = rounddown_pow_of_two(batch + batch/2) - 1;
return batch;
}
--
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