Re: [Xen-devel] [PATCH 4/9] xen: sched: add .init_pdata hook to the scheduler interface

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Thu, 2015-10-01 at 04:12 -0600, Jan Beulich wrote:

> Okay. The thing is that looking at schedule_cpu_switch() alone
> (and also considering its name) it is not clear that all callers
> either
> move the CPU into unusable state (from scheduling pov) or out
> of it, but never between CPUs from usable to usable. 
>
I agree.

> No assertion, no comment, nothing. IOW even if not an active bug,
> at least a latent one with your changes.
>
Well, for sure the patch does fix an actual bug, as detailed in the
changelog. Two of them, actually, considering that it is this
alloc<-->init split that allows to fix the Credit2 runqueue bug.

But sure I don't want to introduce a new bug --no matter whether actual
or latent-- even if I'm fixing two! :-D

I certainly can add both, a comment and an ASSERT(). Is that ok?

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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