Re: [Xen-devel] [PATCH v3 0/6] xen: RCU: x86/ARM: Add support of rcu_idle_{enter, exit}

[Tim Deegan <tim@xxxxxxx>]

At 20:04 +0200 on 18 Aug (1503086640), Dario Faggioli wrote:
> Hey,
> 
> I know, v2 of this series just went out. But since I leave for 2 weeks, I
> wanted the version with as much as possible comments addressed to be on the
> list, and since it was rather quick to do that (and test it), for latest Tim's
> comment, here I am.
> 
> So, basically, this is v2, as here:
> 
>  https://lists.xen.org/archives/html/xen-devel/2017-08/msg01881.html
> 
> But with, as Tim suggested, the idle_cpumask initialized to "all clear". The
> various CPUs, therefore, are considered busy when they come up, and clear 
> their
> own bit in the mask, as soon as they enter the idle loop for the first time
> (which is pretty soon). Doing like this, we close another window for a
> potential (although, rather unlikely) race/unnecessary extension of the grace
> period, and we simplify the code (a.k.a. 'win-win' :-D).

Thanks!

Reviewed-by: Tim Deegan <tim@xxxxxxx>

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