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

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Message-ID: <aTFp8BOJUmMbAUjI@kernel.org>
Date: Thu, 4 Dec 2025 13:01:04 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Pasha Tatashin <pasha.tatashin@...een.com>,
	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 04, 2025 at 11:01:58AM +0100, Arnd Bergmann 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>

Acked-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

-- 
Sincerely yours,
Mike.