linux-kernel - Re: [PATCH] mm: make MEMFD_CREATE into a selectable config option

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Message-ID: <20230703224803.GF4378@monkey>
Date:   Mon, 3 Jul 2023 15:48:03 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Thomas Weißschuh <linux@...ssschuh.net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Willy Tarreau <w@....eu>,
        Zhangjin Wu <falcon@...ylab.org>
Subject: Re: [PATCH] mm: make MEMFD_CREATE into a selectable config option

On 06/30/23 08:32, Darrick J. Wong wrote:
> On Fri, Jun 30, 2023 at 11:08:53AM +0200, Thomas Weißschuh wrote:
> > The memfd_create() syscall, enabled by CONFIG_MEMFD_CREATE, is useful on
> > its own even when not required by CONFIG_TMPFS or CONFIG_HUGETLBFS.
> 
> If you don't have tmpfs or hugetlbfs enabled, then what fs ends up
> backing the file returned by memfd_create()?  ramfs?
> 
> (Not an objection, I'm just curious...)
> 

It looks like shmem/tmpfs falls back to ramfs?

-- 
Mike Kravetz