Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1280430

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

Show all headers | View raw

On Fri, 27 Nov 2015 12:07:10 -0800 Josh Triplett <josh@joshtriplett.org> wrote:

> 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

It's a bit old fashioned to add an expression like this at the
definition site anyway.  The cool new thing is to do

	def_bool ARCH_WANT_USELIB

then go off and define ARCH_WANT_USELIB in the appropriate places in
the per-arch Kconfig files.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2] uselib: default depending if libc5 was used Riku Voipio <riku.voipio@linaro.org> - 2015-11-27 12:20 +0100
  Re: [PATCH v2] uselib: default depending if libc5 was used Josh Triplett <josh@joshtriplett.org> - 2015-11-27 21:10 +0100
    Re: [PATCH v2] uselib: default depending if libc5 was used Andrew Morton <akpm@linux-foundation.org> - 2015-12-01 01:40 +0100
      Re: [PATCH v2] uselib: default depending if libc5 was used Josh Triplett <josh@joshtriplett.org> - 2015-12-01 02:10 +0100
      Re: [PATCH v2] uselib: default depending if libc5 was used Geert Uytterhoeven <geert@linux-m68k.org> - 2015-12-01 09:50 +0100
        Re: [PATCH v2] uselib: default depending if libc5 was used Riku Voipio <riku.voipio@linaro.org> - 2015-12-01 13:40 +0100
          Re: [PATCH v2] uselib: default depending if libc5 was used Josh Triplett <josh@joshtriplett.org> - 2015-12-01 17:30 +0100

csiph-web