linux-kernel - [PATCH v2 4/5] mm: page_counters: initialize usage using ATOMIC_LONG

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Message-ID: <20240724202103.1210065-5-roman.gushchin@linux.dev>
Date: Wed, 24 Jul 2024 20:21:02 +0000
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Roman Gushchin <roman.gushchin@...ux.dev>
Subject: [PATCH v2 4/5] mm: page_counters: initialize usage using ATOMIC_LONG_INIT() macro

When a page_counter structure is initialized, there is no need to
use an atomic set operation to initialize usage counters because at
this point the structure is not visible to anybody else.
ATOMIC_LONG_INIT() is what should be used in such cases.

Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
 include/linux/page_counter.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/page_counter.h b/include/linux/page_counter.h
index 701e1255c456..ee740ed8cb90 100644
--- a/include/linux/page_counter.h
+++ b/include/linux/page_counter.h
@@ -114,7 +114,7 @@ static inline void page_counter_init(struct page_counter *counter,
 	unsigned long i;
 
 	for (i = 0; i < MCT_NR_ITEMS; i++) {
-		atomic_long_set(&counter->usage[i], 0);
+		counter->usage[i] = (atomic_long_t)ATOMIC_LONG_INIT(0);
 		counter->max[i] = PAGE_COUNTER_MAX;
 	}
 	counter->parent = parent;
-- 
2.46.0.rc1.232.g9752f9e123-goog