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[92.145.124.62]) by smtp.gmail.com with ESMTPSA id l10-20020a7bc44a000000b003e21dcccf9fsm2223136wmi.16.2023.03.02.01.35.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Mar 2023 01:35:41 -0800 (PST) From: Alexandre Ghiti To: Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Vineet Gupta , Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Geert Uytterhoeven , Michal Simek , Thomas Bogendoerfer , "James E . J . Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Chris Zankel , Max Filippov , Arnd Bergmann , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH v4 00/24] Remove COMMAND_LINE_SIZE from uapi Date: Thu, 2 Mar 2023 10:35:15 +0100 Message-Id: <20230302093539.372962-1-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230302_013547_715432_2E27852C X-CRM114-Status: GOOD ( 19.40 ) X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: This all came up in the context of increasing COMMAND_LINE_SIZE in the RISC-V port. In theory that's a UABI break, as COMMAND_LINE_SIZE is the maximum length of /proc/cmdline and userspace could stati [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:32d listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This all came up in the context of increasing COMMAND_LINE_SIZE in the RISC-V port. In theory that's a UABI break, as COMMAND_LINE_SIZE is the maximum length of /proc/cmdline and userspace could staticly rely on that to be correct. Usually I wouldn't mess around with changing this sort of thing, but PowerPC increased it with a5980d064fe2 ("powerpc: Bump COMMAND_LINE_SIZE to 2048"). There are also a handful of examples of COMMAND_LINE_SIZE increasing, but they're from before the UAPI split so I'm not quite sure what that means: e5a6a1c90948 ("powerpc: derive COMMAND_LINE_SIZE from asm-generic"), 684d2fd48e71 ("[S390] kernel: Append scpdata to kernel boot command line"), 22242681cff5 ("MIPS: Extend COMMAND_LINE_SIZE"), and 2b74b85693c7 ("sh: Derive COMMAND_LINE_SIZE from asm-generic/setup.h."). It seems to me like COMMAND_LINE_SIZE really just shouldn't have been part of the uapi to begin with, and userspace should be able to handle /proc/cmdline of whatever length it turns out to be. I don't see any references to COMMAND_LINE_SIZE anywhere but Linux via a quick Google search, but that's not really enough to consider it unused on my end. This issue was already considered in s390 and they reached the same conclusion in commit 622021cd6c56 ("s390: make command line configurable"). The feedback on the v1 seemed to indicate that COMMAND_LINE_SIZE really shouldn't be part of uapi, so this now touches all the ports. I've tried to split this all out and leave it bisectable, but I haven't tested it all that aggressively. Changes since v3 : * Added RB/AB * Added a mention to commit 622021cd6c56 ("s390: make command line configurable") in the cover letter Changes since v2 : * Fix sh, csky and ia64 builds, as reported by kernel test robot Changes since v1 : * Touches every arch. base-commit-tag: next-20230207 Palmer Dabbelt (24): alpha: Remove COMMAND_LINE_SIZE from uapi arm64: Remove COMMAND_LINE_SIZE from uapi arm: Remove COMMAND_LINE_SIZE from uapi ia64: Remove COMMAND_LINE_SIZE from uapi m68k: Remove COMMAND_LINE_SIZE from uapi microblaze: Remove COMMAND_LINE_SIZE from uapi mips: Remove COMMAND_LINE_SIZE from uapi parisc: Remove COMMAND_LINE_SIZE from uapi powerpc: Remove COMMAND_LINE_SIZE from uapi sparc: Remove COMMAND_LINE_SIZE from uapi xtensa: Remove COMMAND_LINE_SIZE from uapi asm-generic: Remove COMMAND_LINE_SIZE from uapi alpha: Remove empty arc: Remove empty m68k: Remove empty arm64: Remove empty microblaze: Remove empty sparc: Remove empty parisc: Remove empty x86: Remove empty xtensa: Remove empty powerpc: Remove empty mips: Remove empty s390: Remove empty .../admin-guide/kernel-parameters.rst | 2 +- arch/alpha/include/asm/setup.h | 4 +-- arch/alpha/include/uapi/asm/setup.h | 7 ----- arch/arc/include/asm/setup.h | 1 - arch/arc/include/uapi/asm/setup.h | 6 ----- arch/arm/include/asm/setup.h | 1 + arch/arm/include/uapi/asm/setup.h | 2 -- arch/arm64/include/asm/setup.h | 3 ++- arch/arm64/include/uapi/asm/setup.h | 27 ------------------- arch/ia64/include/asm/setup.h | 10 +++++++ arch/ia64/include/uapi/asm/setup.h | 6 ++--- arch/loongarch/include/asm/setup.h | 2 +- arch/m68k/include/asm/setup.h | 3 +-- arch/m68k/include/uapi/asm/setup.h | 17 ------------ arch/microblaze/include/asm/setup.h | 2 +- arch/microblaze/include/uapi/asm/setup.h | 20 -------------- arch/mips/include/asm/setup.h | 3 ++- arch/mips/include/uapi/asm/setup.h | 8 ------ arch/parisc/include/{uapi => }/asm/setup.h | 0 arch/powerpc/include/asm/setup.h | 2 +- arch/powerpc/include/uapi/asm/setup.h | 7 ----- arch/s390/include/asm/setup.h | 1 - arch/s390/include/uapi/asm/setup.h | 1 - arch/sh/include/asm/setup.h | 2 +- arch/sparc/include/asm/setup.h | 6 ++++- arch/sparc/include/uapi/asm/setup.h | 16 ----------- arch/x86/include/asm/setup.h | 2 -- arch/x86/include/uapi/asm/setup.h | 1 - arch/xtensa/include/{uapi => }/asm/setup.h | 0 include/asm-generic/Kbuild | 1 + include/{uapi => }/asm-generic/setup.h | 0 include/uapi/asm-generic/Kbuild | 1 - 32 files changed, 31 insertions(+), 133 deletions(-) delete mode 100644 arch/alpha/include/uapi/asm/setup.h delete mode 100644 arch/arc/include/uapi/asm/setup.h delete mode 100644 arch/arm64/include/uapi/asm/setup.h create mode 100644 arch/ia64/include/asm/setup.h delete mode 100644 arch/m68k/include/uapi/asm/setup.h delete mode 100644 arch/microblaze/include/uapi/asm/setup.h delete mode 100644 arch/mips/include/uapi/asm/setup.h rename arch/parisc/include/{uapi => }/asm/setup.h (100%) delete mode 100644 arch/powerpc/include/uapi/asm/setup.h delete mode 100644 arch/s390/include/uapi/asm/setup.h delete mode 100644 arch/sparc/include/uapi/asm/setup.h delete mode 100644 arch/x86/include/uapi/asm/setup.h rename arch/xtensa/include/{uapi => }/asm/setup.h (100%) rename include/{uapi => }/asm-generic/setup.h (100%)