linux-kernel - Re: Commit 34d76c41 causes linker errors on ia64 with NR

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Date:	Fri, 23 Oct 2009 09:51:51 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Jiri Kosina <jkosina@...e.cz>, Tejun Heo <tj@...nel.org>,
	Jeff Mahoney <jeffm@...e.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>
Subject: Re: Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096


* Luck, Tony <tony.luck@...el.com> 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.

	Ingo
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