Re: [PATCH -next] panic: complete the flush of the hard deadlock log messages to the serial port

[xuqiang (M)]

在 2020/11/24 11:22, xuqiang (M) 写道:
> 在 2020/11/24 3:52, Andrew Morton 写道:
> > On Mon, 23 Nov 2020 13:13:59 +0000 Xu Qiang <xuqiang36@xxxxxxxxxx> 
> > wrote:
> >
> > > when hardlockup_all_cpu_backtrace is on, and there are
> > > a large number of cores in the system, it takes
> > > a long time to output the hard deadlock logs of all cores
> > > to the serial port. When the console_flush_on_panic function
> > > in panic is executed, console_locked is still held.
> > > As a result, garbled characters are displayed in the serial port log.
> > >
> > > To solve this problem, wait for a maximum of 10s for the serial port
> > > to be released before console_flush_on_panic.
> > Wouldn't it be better to wait until all the printing of all those
> > backtraces has completed?
> >
> >
> > .
>
> The fear that there may be some unexpected abnormal situation,
>
> resulting in the serial port has been occupied without release.
>
>
> Thanks
>
>         Xu.
Hi, Are there any other questions about this patch?


Thanks

        Xu.