mm/page_ext: rename offset to index

Here, 'offset' means entry index in page_ext array.  Following patch
will use 'offset' for field offset in each entry so rename current
'offset' to prevent confusion.

Link: http://lkml.kernel.org/r/1471315879-32294-5-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/page_ext.c b/mm/page_ext.c
index 44a4c029c8e7..16292829c5c5 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -102,7 +102,7 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
 struct page_ext *lookup_page_ext(struct page *page)
 {
         unsigned long pfn = page_to_pfn(page);
-        unsigned long offset;
+        unsigned long index;
         struct page_ext *base;
 
         base = NODE_DATA(page_to_nid(page))->node_page_ext;
@@ -119,9 +119,9 @@ struct page_ext *lookup_page_ext(struct page *page)
         if (unlikely(!base))
                 return NULL;
 #endif
-        offset = pfn - round_down(node_start_pfn(page_to_nid(page)),
+        index = pfn - round_down(node_start_pfn(page_to_nid(page)),
                                         MAX_ORDER_NR_PAGES);
-        return base + offset;
+        return base + index;
 }
 
 static int __init alloc_node_page_ext(int nid)