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* [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi
@ 2023-02-14  7:49 Alexandre Ghiti
  2023-02-14  7:49 ` [PATCH v3 01/24] alpha: " Alexandre Ghiti
                   ` (24 more replies)
  0 siblings, 25 replies; 60+ messages in thread
From: Alexandre Ghiti @ 2023-02-14  7:49 UTC (permalink / raw)
  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,
	H . Peter Anvin, Chris Zankel, Max Filippov, Arnd Bergmann,
	linux-doc, linux-kernel, linux-alpha, linux-snps-arc,
	linux-arm-kernel, linux-ia64, loongarch, linux-m68k, linux-mips,
	linux-parisc, linuxppc-dev, linux-riscv, linux-s390, linux-sh,
	sparclinux, linux-xtensa, linux-arch
  Cc: Alexandre Ghiti

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


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^ permalink raw reply	[flat|nested] 60+ messages in thread

end of thread, other threads:[~2023-03-06  9:36 UTC | newest]

Thread overview: 60+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-02-14  7:49 [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 01/24] alpha: " Alexandre Ghiti
2023-02-14  9:07   ` Philippe Mathieu-Daudé
2023-02-14  7:49 ` [PATCH v3 02/24] arm64: " Alexandre Ghiti
2023-02-14 14:14   ` Catalin Marinas
2023-02-14  7:49 ` [PATCH v3 03/24] arm: " Alexandre Ghiti
2023-02-15 12:59   ` Russell King (Oracle)
2023-02-15 13:04     ` Arnd Bergmann
2023-02-23  9:54       ` Alexandre Ghiti
2023-02-23 13:09         ` Arnd Bergmann
2023-02-23 13:11           ` Alexandre Ghiti
2023-03-02  3:17           ` Palmer Dabbelt
2023-02-14  7:49 ` [PATCH v3 04/24] ia64: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 05/24] m68k: " Alexandre Ghiti
2023-02-14  9:00   ` Geert Uytterhoeven
2023-02-14  7:49 ` [PATCH v3 06/24] microblaze: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 07/24] mips: " Alexandre Ghiti
2023-02-14  9:06   ` Philippe Mathieu-Daudé
2023-02-14  7:49 ` [PATCH v3 08/24] parisc: " Alexandre Ghiti
2023-02-14  9:08   ` Philippe Mathieu-Daudé
2023-02-14  9:43     ` Helge Deller
2023-02-14  7:49 ` [PATCH v3 09/24] powerpc: " Alexandre Ghiti
2023-02-15  7:04   ` Michael Ellerman
2023-02-14  7:49 ` [PATCH v3 10/24] sparc: " Alexandre Ghiti
2023-02-14  8:50   ` Sergey Shtylyov
2023-02-14  8:59     ` WANG Xuerui
2023-02-14  9:11       ` Sergey Shtylyov
2023-02-14 10:38       ` John Paul Adrian Glaubitz
2023-02-14  7:49 ` [PATCH v3 11/24] xtensa: " Alexandre Ghiti
2023-02-14 12:56   ` Max Filippov
2023-02-14  7:49 ` [PATCH v3 12/24] asm-generic: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 13/24] alpha: Remove empty <uapi/asm/setup.h> Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 14/24] arc: " Alexandre Ghiti
2023-02-14  9:05   ` Philippe Mathieu-Daudé
2023-02-14  7:49 ` [PATCH v3 15/24] m68k: " Alexandre Ghiti
2023-02-14  9:01   ` Geert Uytterhoeven
2023-02-14  7:49 ` [PATCH v3 16/24] arm64: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 17/24] microblaze: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 18/24] sparc: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 19/24] parisc: " Alexandre Ghiti
2023-02-14  9:08   ` Philippe Mathieu-Daudé
2023-02-14  9:44     ` Helge Deller
2023-02-14  7:49 ` [PATCH v3 20/24] x86: " Alexandre Ghiti
2023-02-14  9:04   ` Philippe Mathieu-Daudé
2023-02-14  7:49 ` [PATCH v3 21/24] xtensa: " Alexandre Ghiti
2023-02-14 13:10   ` Max Filippov
2023-02-14  7:49 ` [PATCH v3 22/24] powerpc: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 23/24] mips: " Alexandre Ghiti
2023-02-14  7:49 ` [PATCH v3 24/24] s390: " Alexandre Ghiti
2023-02-14  8:39   ` Heiko Carstens
2023-02-14  9:05   ` Philippe Mathieu-Daudé
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

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