The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 756b56a9e832e063edc83be7c3889e98c536dd2b Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (VMware)" rostedt@goodmis.org Date: Mon, 14 May 2018 15:40:29 -0400 Subject: [PATCH] ftrace/selftest: Have the reset_trigger code be a bit more careful
The trigger code is picky in how it can be disabled as there may be dependencies between different events and synthetic events. Change the order on how triggers are reset.
1) Reset triggers of all synthetic events first 2) Remove triggers with actions attached to them 3) Remove all other triggers
If this order isn't followed, then some triggers will not be reset, and an error may happen because a trigger is busy.
Cc: stable@vger.kernel.org Fixes: cfa0963dc474f ("kselftests/ftrace : Add event trigger testcases") Reviewed-by: Namhyung Kim namhyung@kernel.org Acked-by: Masami Hiramatsu mhiramat@kernel.org Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org
diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions index 2a4f16fc9819..8393b1c06027 100644 --- a/tools/testing/selftests/ftrace/test.d/functions +++ b/tools/testing/selftests/ftrace/test.d/functions @@ -15,14 +15,29 @@ reset_tracer() { # reset the current tracer echo nop > current_tracer }
-reset_trigger() { # reset all current setting triggers - grep -v ^# events/*/*/trigger | +reset_trigger_file() { + # remove action triggers first + grep -H ':on[^:]*(' $@ | + while read line; do + cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "` + file=`echo $line | cut -f1 -d:` + echo "!$cmd" >> $file + done + grep -Hv ^# $@ | while read line; do cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "` - echo "!$cmd" > `echo $line | cut -f1 -d:` + file=`echo $line | cut -f1 -d:` + echo "!$cmd" > $file done }
+reset_trigger() { # reset all current setting triggers + if [ -d events/synthetic ]; then + reset_trigger_file events/synthetic/*/trigger + fi + reset_trigger_file events/*/*/trigger +} + reset_events_filter() { # reset all current setting filters grep -v ^none events/*/*/filter | while read line; do