All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH v2 00/24] Remove COMMAND_LINE_SIZE from uapi
@ 2022-12-11  6:13 Palmer Dabbelt
  2022-12-11  6:13 ` [PATCH v2 01/24] alpha: " Palmer Dabbelt
                   ` (24 more replies)
  0 siblings, 25 replies; 33+ messages in thread
From: Palmer Dabbelt @ 2022-12-11  6:13 UTC (permalink / raw)
  To: Arnd Bergmann, linux-arch, linux-kernel

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 v1 <https://lore.kernel.org/all/20210423025545.313965-1-palmer@dabbelt.com/>:
* Touches every arch.



^ permalink raw reply	[flat|nested] 33+ messages in thread

end of thread, other threads:[~2023-02-13  7:40 UTC | newest]

Thread overview: 33+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-12-11  6:13 [PATCH v2 00/24] Remove COMMAND_LINE_SIZE from uapi Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 01/24] alpha: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 02/24] arm: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 03/24] arm64: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 04/24] ia64: " Palmer Dabbelt
2022-12-11  8:03   ` kernel test robot
2022-12-11  6:13 ` [PATCH v2 05/24] m68k: " Palmer Dabbelt
2023-01-16 10:07   ` Geert Uytterhoeven
2022-12-11  6:13 ` [PATCH v2 06/24] microblaze: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 07/24] mips: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 08/24] parisc: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 09/24] powerpc: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 10/24] sparc: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 11/24] xtensa: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 12/24] asm-generic: " Palmer Dabbelt
2022-12-11  7:42   ` kernel test robot
2022-12-11 11:04   ` kernel test robot
2022-12-11  6:13 ` [PATCH v2 13/24] alpha: Remove empty <uapi/asm/setup.h> Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 14/24] arc: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 15/24] arm64: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 16/24] m68k: " Palmer Dabbelt
2023-01-16 10:07   ` Geert Uytterhoeven
2022-12-11  6:13 ` [PATCH v2 17/24] microblaze: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 18/24] mips: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 19/24] parisc: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 20/24] powerpc: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 21/24] s390: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 22/24] sparc: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 23/24] x86: " Palmer Dabbelt
2022-12-11  6:13 ` [PATCH v2 24/24] xtensa: " Palmer Dabbelt
2023-02-10 17:10 ` [PATCH v2 00/24] Remove COMMAND_LINE_SIZE from uapi Alexandre Ghiti
2023-02-10 19:37   ` Arnd Bergmann
2023-02-13  7:40     ` Alexandre Ghiti

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.