[PATCH] mm: page_alloc: use enum instead of number for migratetype

[SeongJae Park]

Using enum instead of number for migratetype everywhere would be better
for reading and understanding.

Signed-off-by: SeongJae Park <sj38.park@xxxxxxxxx>
---
 mm/page_alloc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5bcbca5..08f6ed7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -646,7 +646,7 @@ static inline int free_pages_check(struct page *page)
 static void free_pcppages_bulk(struct zone *zone, int count,
 					struct per_cpu_pages *pcp)
 {
-	int migratetype = 0;
+	int migratetype = MIGRATE_UNMOVABLE;
 	int batch_free = 0;
 	int to_free = count;
 
@@ -667,7 +667,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
 		do {
 			batch_free++;
 			if (++migratetype == MIGRATE_PCPTYPES)
-				migratetype = 0;
+				migratetype = MIGRATE_UNMOVABLE;
 			list = &pcp->lists[migratetype];
 		} while (list_empty(list));
 
@@ -4158,7 +4158,9 @@ static void pageset_init(struct per_cpu_pageset *p)
 
 	pcp = &p->pcp;
 	pcp->count = 0;
-	for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++)
+
+	for (migratetype = MIGRATE_UNMOVABLE; migratetype < MIGRATE_PCPTYPES;
+						migratetype++)
 		INIT_LIST_HEAD(&pcp->lists[migratetype]);
 }
 
-- 
1.8.1.2

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