Re: [PATCH, -tip] Make hierarchical RCU be the default

[Ingo Molnar]

* Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> wrote:

> --- a/include/linux/hardirq.h
> +++ b/include/linux/hardirq.h
> @@ -118,7 +118,7 @@ static inline void account_system_vtime(struct task_struct *tsk)
>  }
>  #endif
>  
> -#if defined(CONFIG_NO_HZ) && !defined(CONFIG_CLASSIC_RCU)
> +#if defined(CONFIG_NO_HZ) && !defined(CONFIG_FLAT_RCU)

this can be done in an even lazier fashion, via a ~5 lines patch.

Just add FLAT_RCU as the new kconfig method, and make CONFIG_CLASSIC_RCU 
mirror it via something like:

  config CLASSIC_RCU
  bool
  default FLAT_RCU

that makes your patch only affect the Kconfig file - and makes it easily 
revertable, etc.

	Ingo
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