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authorAnders Roxell <anders.roxell@linaro.org>2018-11-30 15:56:22 +0100
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-05-08 12:15:12 -0400
commit6fc2171c5c03672bae71d04a0f5fa88cc9c3b4e2 (patch)
tree087d547fc1c6e2defff7ce4b8a3248c22520fb67 /kernel/trace
parentbfcd631eb6de474d8e097fd0f9f840fdf7272a1d (diff)
downloadlinux-6fc2171c5c03672bae71d04a0f5fa88cc9c3b4e2.tar.bz2
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.org Co-developed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Anders Roxell <anders.roxell@linaro.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3259019cc66d..4269af5905e4 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -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) {