[Bug runtime/20282] New: implicit declaration of function ‘__get_user_bad’ on recent aarch64 kernel

[mcermak at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20282

            Bug ID: 20282
           Summary: implicit declaration of function ‘__get_user_bad’ on
                    recent aarch64 kernel
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: mcermak at redhat dot com
  Target Milestone: ---

With kernel-4.5.0-0.40.el7.aarch64 kbuild fails thusly:

=======
Pass 3: translated to C into
"/tmp/stapCJl99c/stap_355af5cf9305976cecf5dce2a13ff16c_53860_src.c" using
191104virt/82880res/6208shr/76096data kb, in 20usr/150sys/178real ms.
In file included from /usr/local/share/systemtap/runtime/linux/runtime.h:214:0,
                 from /usr/local/share/systemtap/runtime/runtime.h:26,
                 from
/tmp/stapCJl99c/stap_355af5cf9305976cecf5dce2a13ff16c_53860_src.c:25:
/usr/local/share/systemtap/runtime/stp_string.c: In function
‘_stp_decode_utf8’:
/usr/local/share/systemtap/runtime/stp_string.c:73:2: error: implicit
declaration of function ‘__get_user_bad’
[-Werror=implicit-function-declaration]
  if (_stp_deref_nofault(b, 1, buf, (user ? USER_DS : KERNEL_DS)))
  ^
cc1: all warnings being treated as errors
=======

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