linux-kernel - Re: [PATCH 1/3] memfd: export alloc

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Message-ID: <aXJF-GGFxP55lgs8@kernel.org>
Date: Thu, 22 Jan 2026 17:44:56 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Pratyush Yadav <pratyush@...nel.org>
Cc: Hugh Dickins <hughd@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] memfd: export alloc_file()

On Thu, Jan 22, 2026 at 04:18:39PM +0100, Pratyush Yadav wrote:
> From: "Pratyush Yadav (Google)" <pratyush@...nel.org>
> 
> The Live Update Orchestrator's (LUO) memfd preservation works by
> preserving all the folios of a memfd, re-creating an empty memfd on the
> next boot, and then inserting back the preserved folios.
> 
> Currently it creates the file by directly calling shmem_file_setup().
> This leaves out other work done by alloc_file() like setting up the file
> mode, flags, or calling the security hooks.
> 
> Export alloc_file() to let memfd_luo use it. Rename it to
> memfd_alloc_file() since it is no longer private and thus needs a
> subsystem prefix.
> 
> Signed-off-by: Pratyush Yadav (Google) <pratyush@...nel.org>

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

-- 
Sincerely yours,
Mike.