linux-kernel - Re: [PATCH 2/9] mm, swap: always lock and check the swap cache folio before use

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Message-ID: <CAGsJ_4yMdzUOU6UZ+Ueo__wxHS3WPJoh6u3Lqo7iU05qBHc1fQ@mail.gmail.com>
Date: Tue, 2 Sep 2025 13:40:19 +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 2/9] mm, swap: always lock and check the swap cache folio
 before use

> +/**
> + * folio_contains_swap - Does this folio contain this swap entry?
> + * @folio: The folio.
> + * @entry: The swap entry to check against.
> + *
> + * Swap version of folio_contains()
> + *
> + * Context: The caller should have the folio locked to ensure
> + * nothing will move it out of the swap cache.
> + * Return: true or false.
> + */
> +static inline bool folio_contains_swap(struct folio *folio, swp_entry_t entry)
> +{
> +       pgoff_t offset = swp_offset(entry);
> +
> +       VM_WARN_ON_ONCE(!folio_test_locked(folio));

VM_WARN_ON_ONCE_FOLIO(!folio_test_locked(folio), folio);    ?

Thanks
Barry