Damn, I forgot all about this, and it has now has spread.
f92bac3b141b8 kernel/printk/printk_safe.c (Sergey Senozhatsky 2016-12-27 23:16:05 +0900 267) void printk_safe_flush_on_panic(void)
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 268) {
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 269) /*
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 270) * Make sure that we could access the main ring buffer.
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 271) * Do not risk a double release when more CPUs are up.
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 272) */
554755be08fba kernel/printk/printk_safe.c (Sergey Senozhatsky 2018-05-30 16:03:50 +0900 273) if (raw_spin_is_locked(&logbuf_lock)) {
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 274) if (num_online_cpus() > 1)
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 275) return;
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 276)
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 277) debug_locks_off();
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 278) raw_spin_lock_init(&logbuf_lock);
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 279) }
cf9b1106c81c4 kernel/printk/nmi.c (Petr Mladek 2016-05-20 17:00:42 -0700 280)
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 281) if (raw_spin_is_locked(&safe_read_lock)) {
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 282) if (num_online_cpus() > 1)
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 283) return;
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 284)
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 285) debug_locks_off();
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 286) raw_spin_lock_init(&safe_read_lock);
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 287) }
eb9036b4cf4c0 kernel/printk/printk_safe.c (Muchun Song 2021-02-10 11:48:23 +0800 288)
eb9036b4cf4c0 == 8a8109f303e2 upstream, and accidentally duplicated
most of printk_safe_flush_on_panic().
-Mike
