linux-kernel - [PATCH V4 3/4] mm/damon/core: Using function abs() instead of diff

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Message-Id: <b24e7b82d9efa90daf150d62dea171e19390ad0b.1636989871.git.xhao@linux.alibaba.com>
Date:   Mon, 15 Nov 2021 23:26:14 +0800
From:   Xin Hao <xhao@...ux.alibaba.com>
To:     sjpark@...zon.de
Cc:     xhao@...ux.alibaba.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH V4 3/4] mm/damon/core: Using function abs() instead of diff_of()

In kernel, we can use abs(a - b) to get the absolute value,
So there is no need to redefine a new one.

Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
Reviewed-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index f37c17b53814..4d2c3a0c7c8a 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -757,8 +757,6 @@ static void damon_merge_two_regions(struct damon_target *t,
 	damon_destroy_region(r, t);
 }
 
-#define diff_of(a, b) (a > b ? a - b : b - a)
-
 /*
  * Merge adjacent regions having similar access frequencies
  *
@@ -772,13 +770,13 @@ static void damon_merge_regions_of(struct damon_target *t, unsigned int thres,
 	struct damon_region *r, *prev = NULL, *next;
 
 	damon_for_each_region_safe(r, next, t) {
-		if (diff_of(r->nr_accesses, r->last_nr_accesses) > thres)
+		if (abs(r->nr_accesses - r->last_nr_accesses) > thres)
 			r->age = 0;
 		else
 			r->age++;
 
 		if (prev && prev->ar.end == r->ar.start &&
-		    diff_of(prev->nr_accesses, r->nr_accesses) <= thres &&
+		    abs(prev->nr_accesses - r->nr_accesses) <= thres &&
 		    sz_damon_region(prev) + sz_damon_region(r) <= sz_limit)
 			damon_merge_two_regions(t, prev, r);
 		else
-- 
2.31.0