Re: [PATCH printk v2 2/5] printk: remove safe buffers

[Sergey Senozhatsky]

On (21/04/01 16:17), Petr Mladek wrote:
> > For the long term, we should introduce a printk-context API that allows
> > callers to perfectly pack their multi-line output into a single
> > entry. We discussed [0][1] this back in August 2020.
> 
> We need a "short" term solution. There are currently 3 solutions:
> 
> 1. Keep nmi_safe() and all the hacks around.
> 
> 2. Serialize nmi_cpu_backtrace() by a spin lock and later by
>    the special lock used also by atomic consoles.
> 
> 3. Tell complaining people how to sort the messed logs.

Are we talking about nmi_cpu_backtrace()->dump_stack() or some
other path?

dump_stack() seems to be already serialized by `dump_lock`. Hmm,
show_regs() is not serialized, seems like it should be under the
same `dump_lock` as dump_stack().