mm, highmem: use PKMAP_NR() to calculate an index of pkmap

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

Signed-off-by: Joonsoo Kim <js1304@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/highmem.c b/mm/highmem.c
index 2a07f97dabf11bceb05e69be4143d6cc06a7bd12..017ccccfb4aa2800b2b9125840ce267c1a7bed23 100644 (file)
--- 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]);
        }