Re: mpparse merge

[Ingo Molnar <mingo@elte.hu>]

(Cc:-ing lkml because obviously others are interested in this topic too)

* Andi Kleen <andi@firstfloor.org> wrote:

> Refering to 
> 
> commit 9d92083afb7cabe86c166dce9cc569eabbbd6f99
> Author: Alexey Starikovskiy <astarikovskiy@suse.de>
> Date:   Fri Apr 4 23:43:18 2008 +0400
> 
>     x86: merge mpparse_{32,64}.c
> 
> in linux-next.
> 
> About half of the ifdefs seem to be because 32bit does irq compression 
> and 64bit does not. Len removed that at some point, but when the files 
> are merged I would rather just readd 64bit irq compression (or move 
> 64bit over to per cpu vectors) than have this ifdef jungle

the way Alexey did it is the safest way of doing unifications: keep it 
simple and finegrained first, keep the more complex steps to later. We 
try to stick to that even if there's a temporary jungle of #ifdefs. In a 
related discussion (which was unfortunately private too so no URLs) you 
suggested to Alexey to redesign the mp-parsing code first, then unify 
it. That's the worst possible approach to unification and i advise 
everyone against doing it that way. I very much agree with unifying irq 
vector management - it's not a simple task at all.

	Ingo