[PATCH 04/24] 32-bit userspace ABI: introduce ARCH_32BIT_OFF_T config option

Catalin Marinas
2018-06-08T17:32:07Z

On Wed, May 16, 2018 at 11:18:49AM +0300, Yury Norov wrote:
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 76c0b54443b1..ee079244dc3c 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -264,6 +264,21 @@ config ARCH_THREAD_STACK_ALLOCATOR
> config ARCH_WANTS_DYNAMIC_TASK_STRUCT
> bool
>
> +config ARCH_32BIT_OFF_T
> + bool
> + depends on !64BIT
> + help
> + All new 32-bit architectures should have 64-bit off_t type on
> + userspace side which corresponds to the loff_t kernel type. This
> + is the requirement for modern ABIs. Some existing architectures
> + already have 32-bit off_t. This option is enabled for all such
> + architectures explicitly. Namely: arc, arm, blackfin, cris, frv,
> + h8300, hexagon, m32r, m68k, metag, microblaze, mips32, mn10300,
> + nios2, openrisc, parisc32, powerpc32, score, sh, sparc, tile32,
> + unicore32, x86_32 and xtensa. This is the complete list. Any
> + new 32-bit architecture should declare 64-bit off_t type on user
> + side and so should not enable this option.

Do you know if this is the case for riscv and nds32, merged in the
meantime? If not, I suggest you drop this patch altogether and just
define force_o_largefile() for arm64/ilp32 as we don't seem to stick to
"all new 32-bit architectures should have 64-bit off_t".

--
Catalin