Re: [RFC V2] printk: add warning while drop partial text in msg

[Sergey Senozhatsky]

On (10/18/17 01:10), pierre kuo wrote:
[..]
> > Well, it might get quite complicated, see printk_safe_flush_buffer().
> 
> BTW,  after checking printk_safe_flush_buffer() and related functions,
> we have one question:
> a) Why in printk_safe_log_store(), we need to use  atomic_xxxx operation in it?

because IRQ flush work iterates all CPUs and modifies CPUs' buffer state,
and this easily can race with printk_safe() or printk_nmi() on some of the
CPUs.

	-ss