[Xen-devel] [PATCH 1/3] mm: Optimize pfn calculation in online_page()

[Daniel Kiper <dkiper@xxxxxxxxxxxx>]

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@xxxxxxxxxxxx>
---
 mm/memory_hotplug.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 321fc74..f0651ae 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -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);
-- 
1.5.6.5

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