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

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Message-ID: <86wm32lfnx.fsf@kernel.org>
Date: Thu, 04 Dec 2025 11:12:02 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Pasha Tatashin <pasha.tatashin@...een.com>,  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 04 2025, 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>

Thanks!

Reviewed-by: Pratyush Yadav <pratyush@...nel.org>

> ---
>  kernel/liveupdate/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/liveupdate/Kconfig b/kernel/liveupdate/Kconfig
> index 86a58eaf433a..80b77db2b0e0 100644
> --- a/kernel/liveupdate/Kconfig
> +++ b/kernel/liveupdate/Kconfig
> @@ -53,6 +53,7 @@ config KEXEC_HANDOVER_ENABLE_DEFAULT
>  config LIVEUPDATE
>  	bool "Live Update Orchestrator"
>  	depends on KEXEC_HANDOVER
> +	depends on SHMEM
>  	help
>  	  Enable the Live Update Orchestrator. Live Update is a mechanism,
>  	  typically based on kexec, that allows the kernel to be updated

-- 
Regards,
Pratyush Yadav