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Message-ID: <CAGsJ_4yRa65ogB0d90LmtOigGTqQ9mM-eUU6VbmcX63j6vgHEg@mail.gmail.com>
Date: Tue, 2 Sep 2025 17:55:26 +0800
From: Barry Song <21cnbao@...il.com>
To: Kairui Song <kasong@...cent.com>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
Matthew Wilcox <willy@...radead.org>, Hugh Dickins <hughd@...gle.com>, Chris Li <chrisl@...nel.org>,
Baoquan He <bhe@...hat.com>, Nhat Pham <nphamcs@...il.com>,
Kemeng Shi <shikemeng@...weicloud.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
Ying Huang <ying.huang@...ux.alibaba.com>, Johannes Weiner <hannes@...xchg.org>,
David Hildenbrand <david@...hat.com>, Yosry Ahmed <yosryahmed@...gle.com>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Zi Yan <ziy@...dia.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] mm, swap: use the swap table for the swap cache and
switch API
> +
> +/*
> + * Helpers for accessing or modifying the swap table of a cluster,
> + * the swap cluster must be locked.
> + */
> +static inline void __swap_table_set(struct swap_cluster_info *ci,
> + unsigned int off, unsigned long swp_tb)
> +{
> + VM_WARN_ON_ONCE(off >= SWAPFILE_CLUSTER);
> + atomic_long_set(&ci->table[off], swp_tb);
> +}
> +
> +static inline unsigned long __swap_table_get(struct swap_cluster_info *ci,
> + unsigned int off)
> +{
> + VM_WARN_ON_ONCE(off >= SWAPFILE_CLUSTER);
> + return atomic_long_read(&ci->table[off]);
> +}
> +
Why should this use atomic_long instead of just WRITE_ONCE and
READ_ONCE?
Thanks
Barry
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