[X][B][C][SRU][PATCH 0/1] selftests/ftrace: Fix kprobe string testcase to not probe notrace function

[Po-Hsu Lin]

BugLink: https://bugs.launchpad.net/bugs/1825780

== Justification ==
When running the ftrace in ubunut_kernel_selftests, the "Kprobe event
string type argument" test will fail on Bionic / Cosmic i386:
  [22] Kprobe event string type argument	[FAIL]

This is because the test was trying to probe a notrace function.
# grep create_trace_kprobe /sys/kernel/debug/tracing/available_filter_functions
#

== Fix ==
6fc7c411 (selftests/ftrace: Fix kprobe string testcase to not probe notrace function)
This will change the event to trace in the test, from
create_trace_kprobe to tracefs_create_dir

Patch can be cherry-picked for Cosmic.

For Bionic and Xenial, it can be cherry-picked after the commit 9855c462
for bug 1812809.

Although we don't run this ftrace test in Xenial, it will still be a
plus to fix this.

It's already been applied in D.

This patch belongs to a patchset [1], in which further limits
kprobe-events probing on notrace function. Not sure if we need others
but to address this issue for the testing tool this one will be suffice.

[1] https://lkml.org/lkml/2018/7/30/257

== Test ==
Patch tested with Bionic / Cosmic i386. Test passed as expected:
  [22] Kprobe event string type argument	[PASS]

== Regression potential ==
None.
This patch is just for the kernel testing tool.

Masami Hiramatsu (1):
  selftests/ftrace: Fix kprobe string testcase to not probe notrace
    function

 .../ftrace/test.d/kprobe/kprobe_args_string.tc     | 30 +++++++++-------------
 .../selftests/ftrace/test.d/kprobe/probepoint.tc   |  2 +-
 2 files changed, 13 insertions(+), 19 deletions(-)

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2.7.4