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Date: Thu, 2 Mar 2023 11:06:11 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Alexandre Ghiti <alexghiti@...osinc.com>,
Jonathan Corbet <corbet@....net>,
Richard Henderson <richard.henderson@...aro.org>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
Matt Turner <mattst88@...il.com>,
Vineet Gupta <vgupta@...nel.org>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Huacai Chen <chenhuacai@...nel.org>,
WANG Xuerui <kernel@...0n.name>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Michal Simek <monstr@...str.eu>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
Helge Deller <deller@....de>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>,
"David S . Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H . Peter Anvin" <hpa@...or.com>, Chris Zankel <chris@...kel.net>,
Max Filippov <jcmvbkbc@...il.com>,
Arnd Bergmann <arnd@...db.de>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org,
linux-snps-arc@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org,
linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
linux-arch@...r.kernel.org,
Björn Töpel <bjorn@...nel.org>
Subject: Re: [PATCH v4 00/24] Remove COMMAND_LINE_SIZE from uapi
Hi Arnd,
On 3/2/23 10:35, Alexandre Ghiti wrote:
> 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 <https://lore.kernel.org/all/20230214074925.228106-1-alexghiti@rivosinc.com/>:
> * Added RB/AB
> * Added a mention to commit 622021cd6c56 ("s390: make command line
> configurable") in the cover letter
>
> Changes since v2 <https://lore.kernel.org/all/20221211061358.28035-1-palmer@rivosinc.com/>:
> * Fix sh, csky and ia64 builds, as reported by kernel test robot
>
> Changes since v1 <https://lore.kernel.org/all/20210423025545.313965-1-palmer@dabbelt.com/>:
> * 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 <uapi/asm/setup.h>
> arc: Remove empty <uapi/asm/setup.h>
> m68k: Remove empty <uapi/asm/setup.h>
> arm64: Remove empty <uapi/asm/setup.h>
> microblaze: Remove empty <uapi/asm/setup.h>
> sparc: Remove empty <uapi/asm/setup.h>
> parisc: Remove empty <uapi/asm/setup.h>
> x86: Remove empty <uapi/asm/setup.h>
> xtensa: Remove empty <uapi/asm/setup.h>
> powerpc: Remove empty <uapi/asm/setup.h>
> mips: Remove empty <uapi/asm/setup.h>
> s390: Remove empty <uapi/asm/setup.h>
>
> .../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%)
>
Björn noticed that I should also remove the command line size for riscv
since it was picked up in 6.3 by Palmer...I send a v6 right now, sorry
about that.
Alex
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