linux-kernel - [PATCH 1/4] mm/page_alloc.c: replace the definition of NR_MIGRATETYPE_BITS with PB_migratetype

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Date:   Tue, 23 Jun 2020 20:41:58 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     mgorman@...e.de, akpm@...ux-foundation.org,
        richard.weiyang@...ux.alibaba.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] mm/page_alloc.c: replace the definition of NR_MIGRATETYPE_BITS with PB_migratetype_bits

We already have the definition of PB_migratetype_bits and current
NR_MIGRATETYPE_BITS looks like a cyclic definition.

Just use PB_migratetype_bits is enough.

Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
---
 include/linux/mmzone.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index df1f08486d81..eeb0da54ff5f 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -88,8 +88,7 @@ static inline bool is_migrate_movable(int mt)
 
 extern int page_group_by_mobility_disabled;
 
-#define NR_MIGRATETYPE_BITS (PB_migrate_end - PB_migrate + 1)
-#define MIGRATETYPE_MASK ((1UL << NR_MIGRATETYPE_BITS) - 1)
+#define MIGRATETYPE_MASK ((1UL << PB_migratetype_bits) - 1)
 
 #define get_pageblock_migratetype(page)					\
 	get_pfnblock_flags_mask(page, page_to_pfn(page),		\
-- 
2.20.1 (Apple Git-117)