On Thu 2018-05-31 19:52:15, Sergey Senozhatsky wrote: > On (05/31/18 15:49), Maninder Singh wrote: > > > > This patch make sure printing of log if loglevel at time of storing > > log is greater than current console loglevel. > > > > @why > > In case of async printk, printk thread can miss logs because it checks > > current log level at time of console_unlock. > > Upstream printk has no printing kthread. And we also run > printk()->console_unlock() with disabled preemption.
Yes, the comment was wrong but the problem is real. The console handling is asynchronous even without the kthread. The current console_lock owner is responsible for handling messages also from other CPUs. Best Regards, Petr
