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

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Date:	Thu,  1 Nov 2012 01:56:33 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <js1304@...il.com>, Mel Gorman <mel@....ul.ie>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH v2 1/5] 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.

Cc: Mel Gorman <mel@....ul.ie>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Joonsoo Kim <js1304@...il.com>
Reviewed-by: Minchan Kim <minchan@...nel.org>

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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