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Re: [RFC6 PATCH v6 00/21] ILP32 for ARM64

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Hi Yuri,

On Wed, Apr 6, 2016 at 12:08 AM, Yury Norov <ynorov@caviumnetworks.com> wrote:
> This version is rebased on kernel v4.6-rc2, and has fixes in signal subsystem.
> It works with updated glibc [1] (though very draft), and tested with LTP.
>
> It was tested on QEMU and ThunderX machines. No major difference found.
> This is RFC because ILP32 is not tested in big-endian mode.
>
>  v3: https://lkml.org/lkml/2014/9/3/704
>  v4: https://lkml.org/lkml/2015/4/13/691
>  v5: https://lkml.org/lkml/2015/9/29/911
>
>  v6:
>  - time_t, __kenel_off_t and other types turned to be 32-bit
>    for compatibility reasons (after v5 discussion);

Reading this sparked my interest, so I went to the links above...

What makes you think these "applications that can’t readily be migrated to LP64
because they were written assuming an ILP32 data model, and that will never
become suitable for a LP64 data model and will remain locked into ILP32
operating environments" are more likely to be fixed for y2038 later, than for
LP64 now?

We're already closer to the (future) y2038 than to the (past) introduction of
LP64...

These unfixable legacy applications have been spreading through x32 to
the shiny new arm64 server architecture (does ppc64el also have an ILP32 mode,
or is it planned)? Lots of resources are spent on maintaining the status quo,
instead of on fixing the real problems.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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[RFC6 PATCH v6 00/21] ILP32 for ARM64 Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:10 +0200
  [PATCH 17/25] arm64: introduce binfmt_elf32.c Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 21/25] arm64: signal: share lp64 signal routines to ilp32 Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 09/25] arm64: ensure the kernel is compiled for LP64 Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 23/25] arm64: ilp32: introduce ilp32-specific handlers for sigframe and ucontext Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 13/25] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64 Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 22/25] arm64: signal32: move ilp32 and aarch32 common code to separated file Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 06/25] compat ABI: use non-compat openat and open_by_handle_at variants Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 15/25] arm64: introduce is_a32_task and is_a32_thread (for AArch32 compat) Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 03/25] all: s390: move wrapper infrastructure to generic headers Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 11/25] arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0 instead Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 12/25] arm64: compat: change config dependences to aarch32 Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 14/25] thread: move thread bits accessors to separated file Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 10/25] arm64: rename COMPAT to AARCH32_EL0 in Kconfig Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
    Re: [PATCH 10/25] arm64: rename COMPAT to AARCH32_EL0 in Kconfig "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-04-14 05:30 +0200
  [PATCH 24/25] arm64:ilp32: add vdso-ilp32 and use for signal return Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
    Re: [PATCH 24/25] arm64:ilp32: add vdso-ilp32 and use for signal  return "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-04-13 11:30 +0200
      Re: [PATCH 24/25] arm64:ilp32: add vdso-ilp32 and use for signal  return Yury Norov <ynorov@caviumnetworks.com> - 2016-04-13 18:00 +0200
  [PATCH 07/25] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 05/25] all: wrap needed syscalls in generic unistd Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 08/25] arm64: ilp32: add documentation on the ILP32 ABI for ARM64 Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 19/25] arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32 Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 25/25] arm64:ilp32: add ARM64_ILP32 to Kconfig Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 04/25] all: s390: move compat_wrappers.c from arch/s390/kernel to kernel/ Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:20 +0200
  [PATCH 18/25] arm64: ilp32: introduce binfmt_ilp32.c Yury Norov <ynorov@caviumnetworks.com> - 2016-04-06 00:30 +0200
  Re: [RFC6 PATCH v6 00/21] ILP32 for ARM64 Geert Uytterhoeven <geert@linux-m68k.org> - 2016-04-06 09:00 +0200
    Re: [RFC6 PATCH v6 00/21] ILP32 for ARM64 Geert Uytterhoeven <geert@linux-m68k.org> - 2016-04-07 14:30 +0200

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