selftests/ftrace: Have reset_ftrace_filter handle multiple instances
authorSteven Rostedt (VMware) <rostedt@goodmis.org>
Tue, 6 Feb 2018 22:15:02 +0000 (17:15 -0500)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Thu, 8 Feb 2018 15:13:17 +0000 (10:13 -0500)
commit0787ce336075ac0fa2d356de4e3c2a2488e851a6
treeb28b6e0eca3746c59b96a6e4a86b0d9b8f61e71e
parentdf9d36d9e8adefe0975c7b5888967651b3db3af3
selftests/ftrace: Have reset_ftrace_filter handle multiple instances

If a probe is attached to a static function that is in multiple files with
the same name, removing it by name will remove all instances:

 # grep jump_label_unlock set_ftrace_filter
jump_label_unlock:traceoff:unlimited
jump_label_unlock:traceoff:unlimited

 # echo '!jump_label_unlock:traceoff' >> set_ftrace_filter
 # grep jump_label_unlock set_ftrace_filter
 #

But the loop in reset_ftrace_filter will try to remove multiple instances
multiple times. If this happens the second time will error and cause the
test to fail.

At each iteration of the loop, check to see if the probe being removed still
exists.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
tools/testing/selftests/ftrace/test.d/functions