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[SRU lttng-modules-dkms XENIAL for 4.13 kernel support]

lttng fails to build because of API changes in 4.13.

[FIX]

Apply the following upstream lttng commits for 4.11, 4.12 compat fixes:

Fix-update-mm_vmscan-instrumentation-for-kernel-4.11.patch
Fix-update-btrfs-instrumentation-for-kernel-4.11.patch
Fix-changes-to-the-vm_op-fault-cb-prototype-in-libri.patch
Fix-update-scsi-instrumentation-for-kernel-4.11.patch
Fix-timers-cputime_t-arguments-replaced-by-ull-in-ke.patch
Fix-atomic_add_unless-returns-true-false-rather-than.patch
Fix-kref-changes-for-kernel-4.11.patch
Fix-update-sched-instrumentation-for-kernel-4.12.patch
Fix-update-ringbuffer-for-kernel-4.12.patch
Fix-update-block-instrumentation-for-kernel-4.12.patch
Fix-update-ftrace-probe-for-kernel-4.12.patch
Fix-Build-ftrace-probe-on-kernels-prior-to-4.12.patch
Fix-handle-missing-ftrace-header-on-v4.12.patch
Fix-section-mismatch-warning-caused-by-__exit-annota.patch
Fix-missing-ftrace-header-on-v4.11.patch

Also: Don't build ftrace lttng module for 4.11 upwards as this currently
requires the full kernel source and not just the headers anymore,
add kernel version check in lttng-modules-dkms.dkms.in

[TEST]
from kernel team autotests:

sudo autotest/client/autotest-local
autotest/client/tests/ubuntu_lttng_smoke_test/control

Without the fixes, these will fail.  With the fixes, the regression
tests pass.  Run this 4.4, 4.8 and 4.13-hwe kernels, must pass on all
three kernel versions.

[REGRESSION POTENTIAL]
This affects just the lttng tools.  Could break pre-4.13 older kernels, so needs regression checking on supported kernel versions.

-------------------------------

Kernel 4.13.0-16.19~16.04.3

4 tests failed for the ubuntu_lttng_smoke_test with amd64 / arm64 / i386 / ppc64le systems:
 == lttng smoke test of session create/destroy ==
 Session test-kernel-session created.
 Traces will be written in /tmp/lttng-kernel-trace-21869-session
 PASSED (lttng create)
 Session test-kernel-session destroyed
 PASSED (lttng destroy)

 == lttng smoke test list kernel events ==
 Error: Unable to list kernel events: Kernel tracer not available
 Error: Command error
 FAILED (lttng list --kernel)
 FAILED (lttng list --kernel more output expected)

 == lttng smoke test trace open/close system calls ==
 Session test-kernel-session created.
 Traces will be written in /tmp/lttng-kernel-trace-21869-session
 PASSED (lttng create)
 Error: Event open: Kernel tracer not available (channel channel0, session test-kernel-session)
 Error: Event openat: Kernel tracer not available (channel channel0, session test-kernel-session)
 Error: Event close: Kernel tracer not available (channel channel0, session test-kernel-session)
 FAILED (lttng enable-event)
 Session test-kernel-session destroyed

 == lttng smoke test trace context switches ==
 Session test-kernel-session created.
 Traces will be written in /tmp/lttng-kernel-trace-21869-session
 PASSED (lttng create)
 Error: Event sched_switch: Kernel tracer not available (channel channel0, session test-kernel-session)
 FAILED (lttng enable-event)

** Affects: lttng-modules (Ubuntu)
     Importance: Medium
     Assignee: Colin Ian King (colin-king)
         Status: In Progress


** Tags: patch verification-needed verification-needed-xenial
-- 
ubuntu_lttng_smoke_test failed on A-hwe kernel
https://bugs.launchpad.net/bugs/1727251
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