Merge tag 'perf-urgent-for-mingo-4.13-20170712' of git://git.kernel.org/pub/scm/linux...

Pull perf/urgent fix from Arnaldo Carvalho de Melo:

 - Accept zero as the kernel base address, to resolve symbols on
   architectures that don't partition the virtual address space in
   kernel/user, S/390, is one of such architectures and was where
   this problem was noticed. (Arnaldo Carvalho de Melo)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>