V5 [PATCH 2/2] x86: Add a LD_PRELOAD IFUNC resolver test for CPU_FEATURE_USABLE

[H.J. Lu]

On 10/24/18, Florian Weimer <fweimer@redhat.com> wrote:
> * H. J. Lu:
>
>> I guess you knew that this issue was independent of my new functions.
>> You will get the same error regardless of what the get_free body has.
>
> Yes, the check is certainly overly conservative.  I thought we want to
> remove it.  Don't we trigger it in glibc in a few places?  If the check
> is gone, then I think we will see incorrect results from the new
> interface.
>
> I think we are very consistent right now when it comes to relocations in
> IFUNC handlers.  I want to see this settled before adding something that
> requires a relocation which is (among other things) targeted at IFUNC
> resolvers.
>

<sys/platform/x86.h> isn't targeted for IFUNC.   My first use is to add
x86_tsc_to_ns and x86_ns_to_tsc.   I am enclosing 2 patches here.

-- 
H.J.
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