tracing: Have tracer selftests call cond_resched() before running

As there are more and more internal selftests being added to the Linux
kernel (KSAN, lockdep, etc) the selftests are taking longer to run when
these are enabled. Add a cond_resched() to the calling of
do_run_tracer_selftest() to force a schedule if NEED_RESCHED is set,
otherwise the soft lockup watchdog may trigger on boot up.

Link: https://lkml.kernel.org/r/20230528051742.1325503-3-rostedt@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 87e5920..70f2b51 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2045,6 +2045,13 @@ static int do_run_tracer_selftest(struct tracer *type)
 {
        int ret;
 
+       /*
+        * Tests can take a long time, especially if they are run one after the
+        * other, as does happen during bootup when all the tracers are
+        * registered. This could cause the soft lockup watchdog to trigger.
+        */
+       cond_resched();
+
        tracing_selftest_running = true;
        ret = run_tracer_selftest(type);
        tracing_selftest_running = false;