Re: [RFC 2/2] rcu: Remove ->dynticks_nmi_nesting from struct rcu_dynticks

[Paul E. McKenney]

On Thu, Jun 21, 2018 at 07:08:30PM +0900, Byungchul Park wrote:
> On Thu, Jun 21, 2018 at 03:39:49PM +0900, Byungchul Park wrote:
> 
> [...]
> 
> > I applied what you suggested and re-named rcu_nmi_{enter,exit} to
>                                                ^
>                         rcu_nmi_{enter,exit}_common(bool irq)
> 
> > rcu_irq_{enter,exit} and applied the same re-naming to
>           ^
>      rcu_irq_{enter,exit}_common(bool nmi)
> 
> > ->dynticks_nmi_nesting as well, since those are not things to do with
>            ^
>     dynticks_nmi_nesting -> dynticks_irq_nesting
> 
> > nmi anymore but both irq and nmi.
> > 
> > I think "irq" is better to represent both irq and nmi than "nmi".
> > Please let me know if you don't think so. I can get rid of the re-
> > naming from the patch.

Again, we need to keep "nmi".  There is a lot of irq-safe code in the
Linux kernel, but not so much nmi-safe code, so we need to give the
reader as many hints as we can that this code is unusual.

							Thanx, Paul