I think this can be marked as verificaiton-done since we know the build
is now fine.

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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https://bugs.launchpad.net/bugs/1858798

Title:
  tools/perf fails to build after Xenial update to 4.4.208 upstream
  stable release

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  [Impact]
  xenial/linux after the update to 4.4.208 upstream stable fails to build 
tools/perf on environments that don't have libunwind installed.

  https://launchpad.net/~canonical-kernel-
  team/+archive/ubuntu/ppa/+build/18530346/+files/buildlog_ubuntu-
  xenial-powerpc.linux_4.4.0-172.201_BUILDING.txt.gz

  [...]
  builtin-report.c: In function ‘report__setup_sample_type’:
  builtin-report.c:289:6: error: ‘dwarf_callchain_users’ undeclared (first use 
in this function)
    if (dwarf_callchain_users) {
        ^
  [...]

  This is caused by the following commit from linux-4.4.y:

  commit faece3af80729763bb28449fa803d12c962571bd
  Author: Jin Yao <yao....@linux.intel.com>
  Date:   Fri Oct 11 10:21:22 2019 +0800

      perf report: Add warning when libunwind not compiled in

      [ Upstream commit 800d3f561659b5436f8c57e7c26dd1f6928b5615 ]

  [Fix]
  Revert the mentioned commit. The variable 'dwarf_callchain_users' was 
introduced by eabad8c6856f "perf unwind: Do not look just at the global 
callchain_param.record_mode" which as of now hasn't been backported to stable 
linux-4.4.y.

  [Test]
  Build the kernel on PPA for powerpc, ppc64el and s390x.

  [Regression Potential]
  Null. This commit is supposed to only add a warning and is breaking the build 
for some architectures, so reverting it will not cause any regression for the 
users.

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