From: Alexandre Ghiti <alexghiti@rivosinc.com>
To: Jonathan Corbet <corbet@lwn.net>,
Richard Henderson <richard.henderson@linaro.org>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Matt Turner <mattst88@gmail.com>,
Vineet Gupta <vgupta@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Michal Simek <monstr@monstr.eu>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
"James E . J . Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Paul Walmsley <paul.walmsley>
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi
Date: Tue, 14 Feb 2023 08:49:01 +0100 [thread overview]
Message-ID: <20230214074925.228106-1-alexghiti__1570.23960943974$1676361018$gmane$org@rivosinc.com> (raw)
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.
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 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%)
--
2.37.2
next reply other threads:[~2023-02-14 7:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-14 7:49 Alexandre Ghiti [this message]
[not found] <20230214074925.228106-1-alexghiti@rivosinc.com>
2023-02-14 8:38 ` [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi Heiko Carstens
2023-02-14 8:58 ` Geert Uytterhoeven
2023-02-14 9:19 ` Heiko Carstens
2023-03-02 3:17 ` Palmer Dabbelt
2023-03-02 7:57 ` Alexandre Ghiti
2023-03-02 19:50 ` H. Peter Anvin
2023-03-03 11:59 ` Alexandre Ghiti
2023-03-03 16:40 ` Arnd Bergmann
2023-03-06 9:35 ` Alexandre Ghiti
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='20230214074925.228106-1-alexghiti__1570.23960943974$1676361018$gmane$org@rivosinc.com' \
--to=alexghiti@rivosinc.com \
--cc=James.Bottomley@HansenPartnership.com \
--cc=catalin.marinas@arm.com \
--cc=chenhuacai@kernel.org \
--cc=christophe.leroy@csgroup.eu \
--cc=corbet@lwn.net \
--cc=deller@gmx.de \
--cc=geert@linux-m68k.org \
--cc=ink@jurassic.park.msu.ru \
--cc=kernel@xen0n.name \
--cc=linux@armlinux.org.uk \
--cc=mattst88@gmail.com \
--cc=monstr@monstr.eu \
--cc=mpe@ellerman.id.au \
--cc=npiggin@gmail.com \
--cc=richard.henderson@linaro.org \
--cc=tsbogend@alpha.franken.de \
--cc=vgupta@kernel.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).