linux-kernel - Re: [PATCH v2] uselib: default depending if libc5 was used

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Date:	Fri, 27 Nov 2015 12:07:10 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Riku Voipio <riku.voipio@...aro.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v2] uselib: default depending if libc5 was used

On Fri, Nov 27, 2015 at 01:14:20PM +0200, Riku Voipio wrote:
> uselib hasn't been used since libc5; glibc does not use it.
> Deprecate uselib a bit more, by making the default y only
> if libc5 was widely used on the plaform.
> 
> This makes arm64 kernel built with defconfig slighly smaller
> 
> bloat-o-meter:
> add/remove: 0/3 grow/shrink: 0/2 up/down: 0/-1390 (-1390)
> function                                     old     new   delta
> kernel_config_data                         18164   18162      -2
> uselib_flags                                  20       -     -20
> padzero                                      216     192     -24
> sys_uselib                                   380       -    -380
> load_elf_library                             964       -    -964

One question below.

> v2: Disable on X86_64 if no 32bit support
>  init/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index c24b6f7..a4bc657 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -285,7 +285,7 @@ config FHANDLE
>  
>  config USELIB
>  	bool "uselib syscall"
> -	default y
> +	def_bool ALPHA || M68K || SPARC || X86_32 || (X86_64 && IA32_EMULATION)

IA32_EMULATION depends on X86_64, so doesn't that reduce to:
	def_bool ALPHA || M68K || SPARC || X86_32 || IA32_EMULATION
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