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Date:	Mon, 26 Oct 2009 17:38:07 +0100 (CET)
From:	Jiri Kosina <>
To:	Ingo Molnar <>
Cc:	"Luck, Tony" <>, Tejun Heo <>,
	Jeff Mahoney <>,
	Peter Zijlstra <>,
	Linux Kernel Mailing List <>,
	"Yu, Fenghua" <>,
	"" <>
Subject: Re: Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096

On Fri, 23 Oct 2009, Jiri Kosina wrote:

> > > > Tony, is the change that will eventually have to be made to ia64 
> > > > pagefault handler too intrusive for -rc6, and should we rather go 
> > > > with my workaround instead, and try to find something proper for 
> > > > 2.6.33?
> > > 
> > > Using __alloc_percpu() rather than static declaration looks to be the 
> > > right fix here.  Not a "workaround".
> > 
> > It is a workaround for the IA64 build failure.
> > 
> > It's also an improvement of the scheduler code (we generally try to 
> > eliminate NR_CPUs scaling of allocations) - but code improvements need 
> > to happen much sooner than -rc6/-rc7.
> Unfortunately refactoring the ia4 pagefault handler would require some 
> refactoring in order to eliminate the 64k limitation, as far as I know, 
> which doesn't seem to be feasible for this timeframe either.
> So if I personally have to chose from these two options, I'd prefer my 
> patch for 2.6.32 and it'd be helpful if ia64 people could look into doing 
> something with the 64k limit for 2.6.33.
> Acceptable for everyone? Ingo/Peter, will you merge this asap please, so 
> that we don't miss 2.6.32 with it?

This stil seems unfixed in the relevant trees I have checked ... anyone 
has strong objections to this, which cause the patch to be delayed?


Jiri Kosina
SUSE Labs, Novell Inc.

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