linux-kernel - Re: [PATCH v2] page cache: Store only head pages in i

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Message-ID: <20190215202056.GK12668@bombadil.infradead.org>
Date:   Fri, 15 Feb 2019 12:20:57 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
        William Kucharski <william.kucharski@...cle.com>
Subject: Re: [PATCH v2] page cache: Store only head pages in i_pages

On Fri, Feb 15, 2019 at 01:41:15AM +0300, Kirill A. Shutemov wrote:
>   - __delete_from_swap_cache() will blow up on
> 
> 	VM_BUG_ON_PAGE(entry != page + i, entry);

Right.

@@ -167,7 +167,7 @@ void __delete_from_swap_cache(struct page *page, swp_entry_t entry)
 
        for (i = 0; i < nr; i++) {
                void *entry = xas_store(&xas, NULL);
-               VM_BUG_ON_PAGE(entry != page + i, entry);
+               VM_BUG_ON_PAGE(entry != page, entry);
                set_page_private(page + i, 0);
                xas_next(&xas);
        }