linux-kernel - [PATCH] mm/lru: simplify is_file_lru() and is_active

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Message-ID: <20201117164919.GA82821@rlk>
Date:   Wed, 18 Nov 2020 00:49:19 +0800
From:   Hui Su <sh_def@....com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     sh_def@....com
Subject: [PATCH] mm/lru: simplify is_file_lru() and is_active_lru()

page->lru bit 0 can tell whether the page is
avtive page or not.
page->lru bit 1 can tell whether the page is
file page or not.

Signed-off-by: Hui Su <sh_def@....com>
---
 include/linux/mmzone.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index fb3bf696c05e..294369c652d0 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -258,12 +258,12 @@ enum lru_list {
 
 static inline bool is_file_lru(enum lru_list lru)
 {
-	return (lru == LRU_INACTIVE_FILE || lru == LRU_ACTIVE_FILE);
+	return lru & LRU_FILE;
 }
 
 static inline bool is_active_lru(enum lru_list lru)
 {
-	return (lru == LRU_ACTIVE_ANON || lru == LRU_ACTIVE_FILE);
+	return lru & LRU_ACTIVE;
 }
 
 #define ANON_AND_FILE 2
-- 
2.29.0