selftests/ftrace: Move kprobe/uprobe check_error() to test.d/functions

The k/uprobe_sytax_errors test case defines a check_error() function
used to run a command and check the position of the caret in the
output.

This would be useful for other ftrace facilities too, so move it to
test.d/functions for use by anyone.  In the process, rename it to
ftrace_errlog_check() and parametrize it for general use.

Link: http://lkml.kernel.org/r/9f88080a06f1755811f69081926afe7e5cb53178.1554072478.git.tom.zanussi@linux.intel.comAcked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/testing/selftests/ftrace/test.d/functions

@@ -109,3 +109,15 @@ LOCALHOST=127.0.0.1
 yield() {
     ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
 }
+
+ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
+    pos=$(echo -n "${2%^*}" | wc -c) # error position
+    command=$(echo "$2" | tr -d ^)
+    echo "Test command: $command"
+    echo > error_log
+    (! echo "$command" > "$3" ) 2> /dev/null
+    grep "$1: error:" -A 3 error_log
+    N=$(tail -n 1 error_log | wc -c)
+    # "  Command: " and "^\n" => 13
+    test $(expr 13 + $pos) -eq $N
+}

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc

@@ -7,15 +7,7 @@
 [ -f error_log ] || exit_unsupported
 
 check_error() { # command-with-error-pos-by-^
-pos=$(echo -n "${1%^*}" | wc -c) # error position
-command=$(echo "$1" | tr -d ^)
-echo "Test command: $command"
-echo > error_log
-(! echo "$command" > kprobe_events ) 2> /dev/null
-grep "trace_kprobe: error:" -A 3 error_log
-N=$(tail -n 1 error_log | wc -c)
-# "  Command: " and "^\n" => 13
-test $(expr 13 + $pos) -eq $N
+    ftrace_errlog_check 'trace_kprobe' "$1" 'kprobe_events'
 }
 
 if grep -q 'r\[maxactive\]' README; then

tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc

@@ -7,15 +7,7 @@
 [ -f error_log ] || exit_unsupported
 
 check_error() { # command-with-error-pos-by-^
-pos=$(echo -n "${1%^*}" | wc -c) # error position
-command=$(echo "$1" | tr -d ^)
-echo "Test command: $command"
-echo > error_log
-(! echo "$command" > uprobe_events ) 2> /dev/null
-grep "trace_uprobe: error:" -A 3 error_log
-N=$(tail -n 1 error_log | wc -c)
-# "  Command: " and "^\n" => 13
-test $(expr 13 + $pos) -eq $N
+    ftrace_errlog_check 'trace_uprobe' "$1" 'uprobe_events'
 }
 
 check_error 'p ^/non_exist_file:100'	# FILE_NOT_FOUND