From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "David Hildenbrand (Arm)" <david@kernel.org>,
Hajime Tazaki <thehajime@gmail.com>,
johannes@sipsolutions.net, linux-mm@kvack.org,
liam@infradead.org, rbm@suse.com, akpm@linux-foundation.org,
luto@amacapital.net, brendan.jackman@linux.dev,
liuhangbin@gmail.com, corbet@lwn.net, kees@kernel.org,
broonie@kernel.org, mhocko@suse.com, rppt@kernel.org,
shuah@kernel.org, surenb@google.com, vbabka@kernel.org,
wad@chromium.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-um@lists.infradead.org,
daniel@thingy.jp
Subject: Re: [PATCH v4 1/2] selftests: run tests on nommu architecture
Date: Fri, 2 Oct 2026 12:53:31 +0100 [thread overview]
Message-ID: <ar-bIzYDdlOKUqla@gremlin> (raw)
In-Reply-To: <CAMuHMdUKcUxHZKhTEF1gwWrU1o8O6jt6N3r90V5hynrLFdwY0A@mail.gmail.com>
On Fri, Oct 02, 2026 at 01:38:31PM +0200, Geert Uytterhoeven wrote:
> On Fri, 2 Oct 2026 at 10:10, Lorenzo Stoakes (ARM) <ljs@kernel.org> wrote:
> > But fork() -> -EINVAL or -ENOSYS = nommu, then just have the child quit and
> > etc. should do it.
>
> fork() is not strictly an MMU-feature (you can implement fork on nommu
> if all memory accesses are done relative to a base address register),
> while I think mprotect() is an MMU-feature. Unless it can also be used
> to change the protection using the one or two BARs most MCU haves?
> Anything else that is a real MMU-feature? Non-identity mmap()?
Does any nommu arch implement fork() in linux?
--
Cheers, Lorenzo
next prev parent reply other threads:[~2026-10-02 11:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-29 23:57 [PATCH v4 0/2] support kselftest on nommu platform Hajime Tazaki
2026-09-29 23:57 ` [PATCH v4 1/2] selftests: run tests on nommu architecture Hajime Tazaki
2026-09-30 9:17 ` Lorenzo Stoakes (ARM)
2026-10-01 7:08 ` David Hildenbrand (Arm)
2026-10-01 8:42 ` Lorenzo Stoakes (ARM)
2026-10-01 10:01 ` Johannes Berg
2026-10-02 2:38 ` Hajime Tazaki
2026-10-02 6:08 ` David Hildenbrand (Arm)
2026-10-02 8:10 ` Lorenzo Stoakes (ARM)
2026-10-02 11:38 ` Geert Uytterhoeven
2026-10-02 11:53 ` Lorenzo Stoakes (ARM) [this message]
2026-10-02 12:21 ` David Hildenbrand (Arm)
2026-10-03 22:39 ` Hajime Tazaki
2026-09-29 23:57 ` [PATCH v4 2/2] selftests/nommu: add nommu mmap and mremap behavior tests Hajime Tazaki
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