From: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> commit 210f9df02611cbe641ced3239122b270fd907d86 upstream. The selftest for ftrace checks some features by checking if the README has text that states the feature is supported by that kernel. Unfortunately, this check gives false positives because it many not be checked if there's spaces in the string to check. This is due to the compare between the required variable with the ":README" string stripped, because neither has quotes around them. Link: https://lkml.kernel.org/r/20210820204742.087177341@xxxxxxxxxxx Cc: "Tzvetomir Stoyanov" <tz.stoyanov@xxxxxxxxx> Cc: Tom Zanussi <zanussi@xxxxxxxxxx> Cc: Shuah Khan <shuah@xxxxxxxxxx> Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> Cc: linux-kselftest@xxxxxxxxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Fixes: 1b8eec510ba64 ("selftests/ftrace: Support ":README" suffix for requires") Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/ftrace/test.d/functions | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/tools/testing/selftests/ftrace/test.d/functions +++ b/tools/testing/selftests/ftrace/test.d/functions @@ -115,7 +115,7 @@ check_requires() { # Check required file echo "Required tracer $t is not configured." exit_unsupported fi - elif [ $r != $i ]; then + elif [ "$r" != "$i" ]; then if ! grep -Fq "$r" README ; then echo "Required feature pattern \"$r\" is not in README." exit_unsupported
