From: Wei Yang <weiyang@linux.vnet.ibm.com>
Date: Tue, 8 Sep 2015 21:59:48 +0000 (-0700)
Subject: mm/page_alloc.c: refine the calculation of highest possible node id
X-Git-Tag: omap-for-v4.3/fixes-rc1~54^2~110
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=904a9553d4fcdc0c7d5621f6178f0e07598701dc;p=pandora-kernel.git

mm/page_alloc.c: refine the calculation of highest possible node id

nr_node_ids records the highest possible node id, which is calculated by
scanning the bitmap node_states[N_POSSIBLE].  Current implementation
scan the bitmap from the beginning, which will scan the whole bitmap.

This patch reverses the order by scanning from the end with
find_last_bit().

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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