mm, highmem: use PKMAP_NR() to calculate an index of pkmap
authorJoonsoo Kim <js1304@gmail.com>
Wed, 12 Dec 2012 00:01:17 +0000 (16:01 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 12 Dec 2012 01:22:24 +0000 (17:22 -0800)
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/highmem.c

index 2da13a5c50e2b48e8fe8dea34d4bd4835c127da9..2576a71189815abfd7bcf86c88ff3647e4a17c23 100644 (file)
@@ -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]);
        }