linux-kernel - [PATCH] mm: vmstat: Use helper macro abs()

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Message-ID: <20200905084008.15748-1-linmiaohe@huawei.com>
Date:   Sat, 5 Sep 2020 04:40:08 -0400
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm: vmstat: Use helper macro abs()

Use helper macro abs() to simplify the "x > t || x < -t" cmp.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/vmstat.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 06fd13ebc2b8..648c2d6ddce2 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -329,7 +329,7 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
 
 	t = __this_cpu_read(pcp->stat_threshold);
 
-	if (unlikely(x > t || x < -t)) {
+	if (unlikely(abs(x) > t)) {
 		zone_page_state_add(x, zone, item);
 		x = 0;
 	}
@@ -354,7 +354,7 @@ void __mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
 
 	t = __this_cpu_read(pcp->stat_threshold);
 
-	if (unlikely(x > t || x < -t)) {
+	if (unlikely(abs(x) > t)) {
 		node_page_state_add(x, pgdat, item);
 		x = 0;
 	}
@@ -515,7 +515,7 @@ static inline void mod_zone_state(struct zone *zone,
 		o = this_cpu_read(*p);
 		n = delta + o;
 
-		if (n > t || n < -t) {
+		if (abs(n) > t) {
 			int os = overstep_mode * (t >> 1) ;
 
 			/* Overflow must be added to zone counters */
@@ -577,7 +577,7 @@ static inline void mod_node_state(struct pglist_data *pgdat,
 		o = this_cpu_read(*p);
 		n = delta + o;
 
-		if (n > t || n < -t) {
+		if (abs(n) > t) {
 			int os = overstep_mode * (t >> 1) ;
 
 			/* Overflow must be added to node counters */
-- 
2.19.1