From: "Arnd Bergmann" <arnd@arndb.de>
To: "schuster.simon@siemens-energy.com"
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Subject: Re: [PATCH v2 3/4] arch: copy_thread: pass clone_flags as u64
Date: Mon, 01 Sep 2025 15:30:20 +0200 [thread overview]
Message-ID: <78ca3a1f-2ed9-4450-95ef-d690cf4aace1@app.fastmail.com> (raw)
In-Reply-To: <20250901-nios2-implement-clone3-v2-3-53fcf5577d57@siemens-energy.com>
On Mon, Sep 1, 2025, at 15:09, Simon Schuster via B4 Relay wrote:
> From: Simon Schuster <schuster.simon@siemens-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@siemens-energy.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
next prev parent reply other threads:[~2025-09-01 13:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-01 13:09 [PATCH v2 0/4] nios2: Add architecture support for clone3 Simon Schuster via B4 Relay
2025-09-01 13:09 ` [PATCH v2 1/4] copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64) Simon Schuster via B4 Relay
2025-09-01 13:19 ` Arnd Bergmann
2025-09-01 13:24 ` David Hildenbrand
2025-09-01 13:09 ` [PATCH v2 2/4] copy_process: pass clone_flags as u64 across calltree Simon Schuster via B4 Relay
2025-09-01 13:35 ` Arnd Bergmann
2025-09-01 13:38 ` David Hildenbrand
2025-09-01 13:09 ` [PATCH v2 3/4] arch: copy_thread: pass clone_flags as u64 Simon Schuster via B4 Relay
2025-09-01 13:30 ` Arnd Bergmann [this message]
2025-09-01 13:39 ` Russell King (Oracle)
2025-09-01 13:39 ` David Hildenbrand
2025-09-01 13:51 ` Geert Uytterhoeven
2025-09-02 7:02 ` Andreas Larsson
2025-09-02 7:15 ` John Paul Adrian Glaubitz
2025-09-02 11:44 ` Andreas Larsson
2025-09-02 9:48 ` Guo Ren
2025-09-01 13:09 ` [PATCH v2 4/4] nios2: implement architecture-specific portion of sys_clone3 Simon Schuster via B4 Relay
2025-09-01 13:35 ` Arnd Bergmann
2025-09-01 13:40 ` [PATCH v2 0/4] nios2: Add architecture support for clone3 Christian Brauner
2025-09-01 13:41 ` Christian Brauner
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