linux-kernel - Re: [PATCH v3 11/15] mm, swap: use the swap table for the swap cache and switch API

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Message-ID: <85ddbcf2-09ce-4e58-9731-5fb06adb042f@lucifer.local>
Date: Fri, 12 Sep 2025 10:21:02 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Lance Yang <lance.yang@...ux.dev>
Cc: Kairui Song <ryncsn@...il.com>, 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>, Barry Song <baohua@...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>, Zi Yan <ziy@...dia.com>,
        linux-kernel@...r.kernel.org, Kairui Song <kasong@...cent.com>
Subject: Re: [PATCH v3 11/15] mm, swap: use the swap table for the swap cache
 and switch API

On Thu, Sep 11, 2025 at 10:27:32AM +0800, Lance Yang wrote:
> Hi Kairui,
>
> I'm hitting a build error with allnoconfig:
>
> In file included from mm/shmem.c:44:
> mm/swap.h: In function ‘folio_index’:
> mm/swap.h:462:24: error: implicit declaration of function
> ‘swp_offset’; did you mean ‘pmd_offset’?
> [-Wimplicit-function-declaration]
> 462 | return swp_offset(folio->swap);
>
> It looks like a header might be missing in mm/swap.h. Please let me know
> if you need any more information.

Thanks, I just hit this too with a nommu build locally :)

>
> Cheers,
> Lance

Cheers, Lorenzo