[PATCH v3] Linux: Remove <sys/sysctl.h> and the sysctl function

[Florian Weimer]

* Andreas Schwab:

> On Apr 15 2020, Florian Weimer wrote:
>
>> Changes to v2: Reworded commit message (git describe says
>> v5.4-rc1-1-g61a47c1ad3a4 for the commit hash, but it's really 5.5.)
>
> That's because it's the first commit after v5.4-rc1.

Yes, but there was a v5.4-rc2 too.  It's a reflection of the heavily
parallel development reflected in the history, I guess.

>> diff --git a/NEWS b/NEWS
>> index 3cf738adfb..1449391664 100644
>> --- a/NEWS
>> +++ b/NEWS
>> @@ -16,7 +16,10 @@ Major new features:
>>  
>>  Deprecated and removed features, and other changes affecting compatibility:
>>  
>> -  [Add deprecations, removals and changes affecting compatibility here]
>> +* The deprecated <sys/sysctl.h> header and the sysctl function have been
>> +  removed.  For compatibility with old binaries, the sysctl function
>> +  continues to exist (on thos architectures which had it), but always
>                                +e
>> +  fails with ENOSYS.
>
> I think that should say "as a compatiblity symbol", since you cannot
> relink it (so the function doesn't really exist any more).

Thanks.

What about this?

* The deprecated <sys/sysctl.h> header and the sysctl function have been
  removed.  To support old binaries, the sysctl function continues to
  exist as a compatibility symbol (on those architectures which had it),
  but always fails with ENOSYS.  This reflects the removal of the system
  call from all architectures, starting with Linux 5.5.