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Mon, 1 Sep 2025 09:31:40 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface MIME-Version: 1.0 X-ThreadId: A1XJ5FccVF4B Date: Mon, 01 Sep 2025 15:30:20 +0200 From: "Arnd Bergmann" To: "schuster.simon@siemens-energy.com" , "Dinh Nguyen" , "Christian Brauner" , "Andrew Morton" , "David Hildenbrand" , "Lorenzo Stoakes" , "Liam R. 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Bottomley" , "Helge Deller" , "Madhavan Srinivasan" , "Michael Ellerman" , "Nicholas Piggin" , "Christophe Leroy" , "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" , "Sven Schnelle" , "Yoshinori Sato" , "Rich Felker" , "John Paul Adrian Glaubitz" , "Andreas Larsson" , "Richard Weinberger" , "Anton Ivanov" , "Johannes Berg" , "Borislav Petkov" , "Dave Hansen" , x86@kernel.org, "H. Peter Anvin" , "Chris Zankel" , "Max Filippov" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, "linux-csky@vger.kernel.org" , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, linux-security-module@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Netdev , linux-perf-users@vger.kernel.org, apparmor@lists.ubuntu.com, selinux@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, "linux-openrisc@vger.kernel.org" , linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org Message-Id: <78ca3a1f-2ed9-4450-95ef-d690cf4aace1@app.fastmail.com> In-Reply-To: <20250901-nios2-implement-clone3-v2-3-53fcf5577d57@siemens-energy.com> References: <20250901-nios2-implement-clone3-v2-0-53fcf5577d57@siemens-energy.com> <20250901-nios2-implement-clone3-v2-3-53fcf5577d57@siemens-energy.com> Subject: Re: [PATCH v2 3/4] arch: copy_thread: pass clone_flags as u64 Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 5C16B100014 X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: yinz17dw11ob898u7oirmy75s89ti8su X-HE-Tag: 1756733505-704966 X-HE-Meta: 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 XxSYQiFa 6Jvrfnc4tsX+32Ic0fJWjfKREeCow/oKGF/f+3liY451Bv4bMv8YtM+YFSyPcE9yGjshInHEKXWkuPduXGRNnQTojcg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Sep 1, 2025, at 15:09, Simon Schuster via B4 Relay wrote: > From: Simon Schuster > > 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 Reviewed-by: Arnd Bergmann