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 the usage counter because at this point
the structure is not visible to anybody else.  ATOMIC_LONG_INIT() is what
should be used in such cases.

Link: https://lkml.kernel.org/r/20240726203110.1577216-4-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/page_counter.h b/include/linux/page_counter.h
index 1b3e92c..66ebf9a 100644 (file)
--- a/include/linux/page_counter.h
+++ b/include/linux/page_counter.h
@@ -52,7 +52,7 @@ static inline void page_counter_init(struct page_counter *counter,
                                     struct page_counter *parent,
                                     bool protection_support)
 {
-       atomic_long_set(&counter->usage, 0);
+       counter->usage = (atomic_long_t)ATOMIC_LONG_INIT(0);
        counter->max = PAGE_COUNTER_MAX;
        counter->parent = parent;
        counter->protection_support = protection_support;