V4: [PATCH] x86: Install <sys/platform/x86.h> [BZ #26124]
H.J. Lu
hjl.tools@gmail.com
Wed Jun 24 21:10:19 GMT 2020
On Wed, Jun 24, 2020 at 1:04 PM Adhemerval Zanella via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
>
>
> On 24/06/2020 11:33, Florian Weimer via Libc-alpha wrote:
> > * H. J. Lu:
> >
> >> Here is the updated patch with
> >>
> >> -- Macro: int HAS_CPU_FEATURE (NAME)
> >> This macro returns a nonzero value (true) if the processor has the
> >> feature NAME.
> >>
> >> -- Macro: int CPU_FEATURE_USABLE (NAME)
> >> This macro returns a nonzero value (true) if the processor has the
> >> feature NAME and the feature is supported by the operating system.
> >
> > This is indeed less confusing. Thanks.
> >
> > I'm still convinced we have a real use case for HAS_CPU_FEATURE.
> >
> > Does anyone else want to comment on this?
> >
> > Thanks,
> > Florian
> >
>
> Should we provide it only for __USE_GNU (_GNU_SOURCE)? And I guess that cpuid
Do we do that for other <sys/platform/XXX.h> files?
> is not expected to be extendable. The macro API is not my favorite way of
We can expand the cpuid array. We just need to add an alias to
__x86_get_cpu_features
with a new symbol version.
> doing it, but it looks ok.
I will check it in tomorrow if there are no further comments.
Thanks.
--
H.J.
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