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Mon, 1 Sep 2025 09:35:28 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface MIME-Version: 1.0 X-ThreadId: AWRA786TDMiJ Date: Mon, 01 Sep 2025 15:35:06 +0200 From: "Arnd Bergmann" To: "schuster.simon@siemens-energy.com" , "Dinh Nguyen" , "Christian Brauner" , "Andrew Morton" , "David Hildenbrand" , "Lorenzo Stoakes" , "Liam R. Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Ingo Molnar" , "Peter Zijlstra" , "Juri Lelli" , "Vincent Guittot" , "Dietmar Eggemann" , "Steven Rostedt" , "Benjamin Segall" , "Mel Gorman" , "Valentin Schneider" , "Kees Cook" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Alexandre Ghiti" , guoren , "Oleg Nesterov" , "Jens Axboe" , "Alexander Viro" , "Jan Kara" , "Tejun Heo" , "Johannes Weiner" , =?UTF-8?Q?Michal_Koutn=C3=BD?= , "Paul Moore" , "Serge Hallyn" , "James Morris" , "Serge E. Hallyn" , "Anna-Maria Gleixner" , "Frederic Weisbecker" , "Thomas Gleixner" , "Masami Hiramatsu" , "David S . Miller" , "Eric Dumazet" , "Jakub Kicinski" , "Paolo Abeni" , "Simon Horman" , "Mathieu Desnoyers" , "Arnaldo Carvalho de Melo" , "Namhyung Kim" , "Mark Rutland" , "Alexander Shishkin" , "Jiri Olsa" , "Ian Rogers" , "Adrian Hunter" , "John Johansen" , "Stephen Smalley" , "Ondrej Mosnacek" , "Kentaro Takeda" , "Tetsuo Handa" , "Richard Henderson" , "Matt Turner" , "Vineet Gupta" , "Russell King" , "Catalin Marinas" , "Will Deacon" , "Brian Cain" , "Huacai Chen" , "WANG Xuerui" , "Geert Uytterhoeven" , "Michal Simek" , "Thomas Bogendoerfer" , "Jonas Bonn" , "Stefan Kristiansson" , "Stafford Horne" , "James E . J . 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: In-Reply-To: <20250901-nios2-implement-clone3-v2-2-53fcf5577d57@siemens-energy.com> References: <20250901-nios2-implement-clone3-v2-0-53fcf5577d57@siemens-energy.com> <20250901-nios2-implement-clone3-v2-2-53fcf5577d57@siemens-energy.com> Subject: Re: [PATCH v2 2/4] copy_process: pass clone_flags as u64 across calltree Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Stat-Signature: nxjrpzbq538x1aoio5dut9gi76y1xpk6 X-Rspam-User: X-Rspamd-Queue-Id: 5EAF6180012 X-Rspamd-Server: rspam05 X-HE-Tag: 1756733732-544681 X-HE-Meta: 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 rgbB8Wli PpuqNk5BGrYzEtg2jh1wFoqFFkY34JfiATMGhIYSs70ZJLyBEmTYHcUvM/ANQJtQY2xTrdmQYbmj7/ntt7er9Md+SIM8//07ULcVtWlIbXhQJ6sMEYPWNorLAM0SOx0y1FKg1HPtA7Qf5TxgKLBQlTIHwsgG/ABDoeZlP3/3bUosnN4WG/I/Tbb4ECo5q2lPuUffuMOk9hfJlqccjF6pCXts0isn5DTj7iYPjJd+UvzKM5sG3/uPiUSUxwAi8h8LeqRTVj+y0kmhfEnX5MYGug8yiRcM9QiFML2efOAZd6NHV3okovyndDqTvlKPV52yhekWq4eRe27gIRHSfO1cBPwilb6INbDcAb6Eo8BXFmuIxkwPcO19aXjgHFlHggdLsHz+egdT+lUtR9TBpCZtyHlm4Ff/fwRRtzuhMLf3DvXk1R1w= 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 callees to > sys_clone3/copy_process (excluding the architecture-specific > copy_thread) 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: Lorenzo Stoakes Reviewed-by: Arnd Bergmann