From: Alexandre Ghiti <alex@ghiti.fr>
To: "Alexandre Ghiti" <alexghiti@rivosinc.com>,
"Jonathan Corbet" <corbet@lwn.net>,
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sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org,
linux-arch@vger.kernel.org, "Björn Töpel" <bjorn@kernel.org>
Subject: Re: [PATCH v4 00/24] Remove COMMAND_LINE_SIZE from uapi
Date: Thu, 2 Mar 2023 11:06:11 +0100 [thread overview]
Message-ID: <040104fc-81b7-fd45-b268-111e39f2927f@ghiti.fr> (raw)
In-Reply-To: <20230302093539.372962-1-alexghiti@rivosinc.com>
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
next prev parent reply other threads:[~2023-03-02 10:07 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-02 9:35 [PATCH v4 00/24] Remove COMMAND_LINE_SIZE from uapi Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 01/24] alpha: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 02/24] arm64: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 03/24] arm: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 04/24] ia64: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 05/24] m68k: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 06/24] microblaze: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 07/24] mips: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 08/24] parisc: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 09/24] powerpc: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 10/24] sparc: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 11/24] xtensa: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 12/24] asm-generic: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 13/24] alpha: Remove empty <uapi/asm/setup.h> Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 14/24] arc: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 15/24] m68k: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 16/24] arm64: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 17/24] microblaze: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 18/24] sparc: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 19/24] parisc: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 20/24] x86: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 21/24] xtensa: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 22/24] powerpc: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 23/24] mips: " Alexandre Ghiti
2023-03-02 9:35 ` [PATCH v4 24/24] s390: " Alexandre Ghiti
2023-03-02 9:47 ` [PATCH v4 00/24] Remove COMMAND_LINE_SIZE from uapi Geert Uytterhoeven
2023-03-02 10:09 ` Alexandre Ghiti
2023-03-02 10:44 ` Geert Uytterhoeven
2023-03-02 10:45 ` Alexandre Ghiti
2023-03-02 10:06 ` Alexandre Ghiti [this message]
2023-03-02 12:38 ` Alexandre Ghiti
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