linux-kernel - Re: [PATCH] mm/uffd: Move USERFAULTFD configs into mm/

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Message-ID: <YmAnUQdQ63jD48ad@cmpxchg.org>
Date:   Wed, 20 Apr 2022 11:31:29 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Alistair Popple <apopple@...dia.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH] mm/uffd: Move USERFAULTFD configs into mm/

On Wed, Apr 20, 2022 at 10:48:23AM -0400, Peter Xu wrote:
> We used to have USERFAULTFD configs stored in init/.  It makes sense as a
> start because that's the default place for storing syscall related configs.
> 
> However userfaultfd evolved a bit in the past few years and some more
> config options were added.  They're no longer related to syscalls and start
> to be not suitable to be kept in the init/ directory anymore, because
> they're pure mm concepts.
> 
> But it's not ideal either to keep the userfaultfd configs separate from
> each other.  Hence this patch moves the userfaultfd configs under init/ to
> be under mm/ so that we'll start to group all userfaultfd configs
> together.
> 
> We do have quite a few examples of syscall related configs that are not put
> under init/Kconfig: FTRACE_SYSCALLS, SWAP, FILE_LOCKING, MEMFD_CREATE..
> They all reside in the dir where they're more suitable for the concept. So
> it seems there's no restriction to keep the role of having syscall related
> CONFIG_* under init/ only.
> 
> Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Peter Xu <peterx@...hat.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>