Commit 6fc2171c authored by Anders Roxell's avatar Anders Roxell Committed by Steven Rostedt (VMware)

tracing: Allow RCU to run between postponed startup tests

When building a allmodconfig kernel for arm64 and boot that in qemu,
CONFIG_FTRACE_STARTUP_TEST gets enabled and that takes time so the
watchdog expires and prints out a message like this:
'watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:1]'
Depending on what the what test gets called from init_trace_selftests()
it stays minutes in the loop.
Rework so that function cond_resched() gets called in the
init_trace_selftests loop.

Link: http://lkml.kernel.org/r/20181130145622.26334-1-anders.roxell@linaro.orgCo-developed-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarAnders Roxell <anders.roxell@linaro.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent bfcd631e
......@@ -1722,6 +1722,10 @@ static __init int init_trace_selftests(void)
pr_info("Running postponed tracer tests:\n");
list_for_each_entry_safe(p, n, &postponed_selftests, list) {
/* This loop can take minutes when sanitizers are enabled, so
* lets make sure we allow RCU processing.
*/
cond_resched();
ret = run_tracer_selftest(p->type);
/* If the test fails, then warn and remove from available_tracers */
if (ret < 0) {
......
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