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mm: optimize pfn calculation in online_page()

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If CONFIG_FLATMEM is enabled pfn is calculated in online_page() more than
once.  It is possible to optimize that and use value established at
beginning of that function.

Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
Acked-by: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Kiper 2011-04-14 15:21:53 -07:00 committed by Linus Torvalds
parent 67954fe957
commit 584208e6b4
1 changed files with 1 additions and 1 deletions
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2
mm/memory_hotplug.c
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@ -375,7 +375,7 @@ void online_page(struct page *page)
#endif
#ifdef CONFIG_FLATMEM
max_mapnr = max(page_to_pfn(page), max_mapnr);
max_mapnr = max(pfn, max_mapnr);
#endif
ClearPageReserved(page);