linux-kernel - Re: [PATCH] mm: memfd_luo: add CONFIG

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Message-ID: <CA+CK2bCE0k_UqUKgfxQAXTSApCWXD02NBGkQiyBCiGosQ5vu1A@mail.gmail.com>
Date: Thu, 4 Dec 2025 09:09:21 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Mike Rapoport <rppt@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Pratyush Yadav <pratyush@...nel.org>, Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: memfd_luo: add CONFIG_SHMEM dependency

On Thu, Dec 4, 2025 at 5:02 AM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The new memfd code fails to link without SHMEM:
>
> aarch64-linux-ld: mm/memfd_luo.o: in function `memfd_luo_retrieve_folios':
> memfd_luo.c:(.text.memfd_luo_retrieve_folios+0xdc): undefined reference to `shmem_add_to_page_cache'
> memfd_luo.c:(.text.memfd_luo_retrieve_folios+0x11c): undefined reference to `shmem_inode_acct_blocks'
> memfd_luo.c:(.text.memfd_luo_retrieve_folios+0x134): undefined reference to `shmem_recalc_inode'
>
> Add a Kconfig dependency to disallow that configuration.
>
> Fixes: b3749f174d68 ("mm: memfd_luo: allow preserving memfd")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Pasha Tatashin <pasha.tatashin@...een.com>