Re: RFC: Add <sys/platform/x86.h> to glibc 2.29

[Florian Weimer <fweimer at redhat dot com>]

On 08/17/2018 05:45 PM, H.J. Lu wrote:
> On Fri, Aug 17, 2018 at 7:50 AM, Florian Weimer <fweimer@redhat.com> wrote:
> > On 07/29/2018 06:16 PM, H.J. Lu wrote:
> > > extern enum cpu_features_kind __x86_get_cpu_kind (void)
> > >        __attribute__ ((const));
> > >
> > > extern const struct cpuid_registers *__x86_get_cpuid_registers
> > >        (unsigned int) __attribute__ ((const));
> > >
> > > extern unsigned int __x86_get_arch_feature (unsigned int)
> > >        __attribute__ ((const));
> >
> >
> > Are these functions supposed to be usable in IFUNC resolvers?
>
> They have the same limitation as
>
> /* Used from outside of glibc to get access to the CPU features
>     structure.  */
> extern const struct cpu_features *__get_cpu_features (void)
>       __attribute__ ((const));

Sorry, this does not answer my question.

> > Shouldn't these identifiers be in the public (non-internal) namespace?
>
> Do we have precedents for such arch specific public functions?

There is modify_ldt.

Thanks,
Florian