** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
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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 <[email protected]>
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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