Messages in this thread | | | Date | Mon, 30 Nov 2015 16:31:29 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH v2] uselib: default depending if libc5 was used |
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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.
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