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mm: use roundown_pow_of_two() in zone_batchsize()

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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@redhat.com>
Tested-by: Lanttor Guo <lanttor.guo@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2009-05-06 16:03:02 -07:00 committed by Linus Torvalds
parent 74614f8d9d
commit 9155203a5d
1 changed files with 1 additions and 1 deletions
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2
mm/page_alloc.c
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@ -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;
}