[PATCH v2 1/5] mm, highmem: use PKMAP_NR() to calculate an index of pkmap

[Joonsoo Kim <js1304@xxxxxxxxx>]

To calculate an index of pkmap, using PKMAP_NR() is more understandable
and maintainable, So change it.

Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Joonsoo Kim <js1304@xxxxxxxxx>
Reviewed-by: Minchan Kim <minchan@xxxxxxxxxx>

diff --git a/mm/highmem.c b/mm/highmem.c
index d517cd1..b3b3d68 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -99,7 +99,7 @@ struct page *kmap_to_page(void *vaddr)
 	unsigned long addr = (unsigned long)vaddr;
 
 	if (addr >= PKMAP_ADDR(0) && addr <= PKMAP_ADDR(LAST_PKMAP)) {
-		int i = (addr - PKMAP_ADDR(0)) >> PAGE_SHIFT;
+		int i = PKMAP_NR(addr);
 		return pte_page(pkmap_page_table[i]);
 	}
 
-- 
1.7.9.5

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