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

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Date:	Tue, 20 Oct 2009 10:18:02 -0400
From:	Jeff Mahoney <jeffm@...e.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Tejun Heo <tj@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: Re: Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096

On 10/20/2009 02:27 AM, Jiri Kosina wrote:
> @@ -1627,11 +1623,10 @@ static int tg_shares_up(struct task_group *tg, void *data)
>  		return 0;
>  
>  	local_irq_save(flags);
> -	usd = &__get_cpu_var(update_shares_data);
>  
>  	for_each_cpu(i, sched_domain_span(sd)) {
>  		weight = tg->cfs_rq[i]->load.weight;
> -		usd->rq_weight[i] = weight;
> +		usd = *per_cpu_ptr(update_shares_data, i) = weight;
>  
>  		/*
>  		 * If there are currently no tasks on the cpu pretend there

I don't think this is what you want here.

In the original version, usd is the percpu var using the current cpu. In
your version, usd is the percpu var using i instead of the current cpu.

I'll post my version of the patch shortly. I don't think keeping most of
the original version is a bad thing. We can just allocate it dynamically
instead.

-Jeff

-- 
Jeff Mahoney
SUSE Labs
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