linux-kernel - Re: [PATCH v2 3/4] arch: copy_thread: pass clone

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Message-ID: <CAMuHMdWyCbOgs6XyW=8PG2pVw1-zhWP_VtsXsGz1HeFrZ6kjdA@mail.gmail.com>
Date: Mon, 1 Sep 2025 15:51:38 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: schuster.simon@...mens-energy.com
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Subject: Re: [PATCH v2 3/4] arch: copy_thread: pass clone_flags as u64

On Mon, 1 Sept 2025 at 15:10, Simon Schuster via B4 Relay
<devnull+schuster.simon.siemens-energy.com@...nel.org> wrote:
> From: Simon Schuster <schuster.simon@...mens-energy.com>
>
> With the introduction of clone3 in commit 7f192e3cd316 ("fork: add
> clone3") the effective bit width of clone_flags on all architectures was
> increased from 32-bit to 64-bit, with a new type of u64 for the flags.
> However, for most consumers of clone_flags the interface was not
> changed from the previous type of unsigned long.
>
> While this works fine as long as none of the new 64-bit flag bits
> (CLONE_CLEAR_SIGHAND and CLONE_INTO_CGROUP) are evaluated, this is still
> undesirable in terms of the principle of least surprise.
>
> Thus, this commit fixes all relevant interfaces of the copy_thread
> function that is called from copy_process to consistently pass
> clone_flags as u64, so that no truncation to 32-bit integers occurs on
> 32-bit architectures.
>
> Signed-off-by: Simon Schuster <schuster.simon@...mens-energy.com>

Fixes: c5febea0956fd387 ("fork: Pass struct kernel_clone_args into copy_thread")

>  arch/m68k/kernel/process.c       | 2 +-

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org> # m68k

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds