On Fri, 27 Nov 2015 12:07:10 -0800 Josh Triplett <[email protected]> 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.
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