sched: Enable might_sleep before initializing drivers.

This allows detection of init bugs in built-in drivers.

Signed-off-by: Arve Hjønnevåg <arve@android.com>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 732e993b564b8179e5723bb88839329eec6df8f5..67359c7f35db0c12b433ac440a16d8be729392cb 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7542,6 +7542,14 @@ static inline int preempt_count_equals(int preempt_offset)
        return (nested == preempt_offset);
 }
 
+static int __might_sleep_init_called;
+int __init __might_sleep_init(void)
+{
+       __might_sleep_init_called = 1;
+       return 0;
+}
+early_initcall(__might_sleep_init);
+
 void __might_sleep(const char *file, int line, int preempt_offset)
 {
        /*
@@ -7566,8 +7574,10 @@ void ___might_sleep(const char *file, int line, int preempt_offset)
 
        rcu_sleep_check(); /* WARN_ON_ONCE() by default, no rate limit reqd. */
        if ((preempt_count_equals(preempt_offset) && !irqs_disabled() &&
-            !is_idle_task(current)) ||
-           system_state != SYSTEM_RUNNING || oops_in_progress)
+            !is_idle_task(current)) || oops_in_progress)
+               return;
+       if (system_state != SYSTEM_RUNNING &&
+           (!__might_sleep_init_called || system_state != SYSTEM_BOOTING))
                return;
        if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
                return;