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.c b/kernel/sched.c
index dc85ceb908322cad7196339f4df8dd58c37b1cec..2aa4e56acd8918f4eeb070edeae186d20142f20f 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7891,13 +7891,24 @@ static inline int preempt_count_equals(int preempt_offset)
        return (nested == PREEMPT_INATOMIC_BASE + 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)
 {
 #ifdef in_atomic
        static unsigned long prev_jiffy;        /* ratelimiting */
 
        if ((preempt_count_equals(preempt_offset) && !irqs_disabled()) ||
-           system_state != SYSTEM_RUNNING || oops_in_progress)
+           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;