Re: [PATCH v6 09/20] arm64:ilp32: share HWCAP between LP64 and ILP32

Arnd Bergmann
2015-12-16T15:55:44Z

On Wednesday 16 December 2015 00:42:35 Yury Norov wrote:
>
> #ifdef CONFIG_COMPAT
> -#define COMPAT_ELF_HWCAP (compat_elf_hwcap)
> -#define COMPAT_ELF_HWCAP2 (compat_elf_hwcap2)
> extern unsigned int compat_elf_hwcap, compat_elf_hwcap2;
> +#define COMPAT_ELF_HWCAP \
> + (is_a32_compat_task() \
> + ? compat_elf_hwcap \
> + : elf_hwcap)
> +
> +#define COMPAT_ELF_HWCAP2 \
> + (is_a32_compat_task() \
> + ? compat_elf_hwcap2 \
> + : 0)
> +
> #endif
>
>

I'm trying to understand how this is used. Are you compiling
fs/compat_binfmt_elf.c twice to handle both 32-bit ELF types?

Would it be easier to use a separate arch/arm64/kernel/binfmt_elf32.c
as a copy of fs/compat_binfmt_elf.c, with all the right macros defined
for ilp32 mode in there?

Arnd