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[Launchpad Bug Tracker <1960165@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lttng-modules -
2.12.5-1ubuntu2~20.04.2

---------------
lttng-modules (2.12.5-1ubuntu2~20.04.2) focal; urgency=medium

  * Cherry picks support for kernel >= v5.14 from
    upstream/stable-2.12. (LP: #1960165)

 -- Andrea Righi <andrea.righi@xxxxxxxxxxxxx>  Sun, 06 Feb 2022 17:07:00
+0000

** Changed in: lttng-modules (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1960165

Title:
  lttng-modules-dkms fails to build on focal with linux hwe 5.15

Status in lttng-modules package in Ubuntu:
  Fix Released
Status in lttng-modules source package in Focal:
  Fix Released

Bug description:
  [Impact]

  lttng-modules-dkms fails to build on focal using kernel 5.15 with the
  following error:

  /home/ubuntu/lttng-modules-2.12.5/lib/ringbuffer/ring_buffer_frontend.c: In function ‘lib_ring_buffer_set_quiescent_channel’:
  /home/ubuntu/lttng-modules-2.12.5/lib/ringbuffer/ring_buffer_frontend.c:759:3: error: implicit declaration of function ‘get_online_cpus’; did you mean ‘get_online_mems’? [-Werror=implicit-function-declaration]
    759 |   get_online_cpus();
        |   ^~~~~~~~~~~~~~~
        |   get_online_mems
  /home/ubuntu/lttng-modules-2.12.5/lib/ringbuffer/ring_buffer_frontend.c:766:3: error: implicit declaration of function ‘put_online_cpus’; did you mean ‘num_online_cpus’? [-Werror=implicit-function-declaration]
    766 |   put_online_cpus();
        |   ^~~~~~~~~~~~~~~
        |   num_online_cpus
  cc1: some warnings being treated as errors

  [Test case]

   $ sudo apt install lttng-modules-dkms

  [Fix]

  Backport upstream fixes to support kernels >= 5.14.

  [Regression potential]

  We may notice regressions with lttng-modules on kernels < 5.14.

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