linux-kernel - Re: [PATCH 04/10] idr: Percpu ida

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Date:	Wed, 7 Aug 2013 17:56:34 +0000
From:	Christoph Lameter <cl@...two.org>
To:	Kent Overstreet <kmo@...erainc.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Jens Axboe <axboe@...nel.dk>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Subject: Re: [PATCH 04/10] idr: Percpu ida

On Wed, 7 Aug 2013, Kent Overstreet wrote:

> +{
> +	DEFINE_WAIT(wait);
> +	struct percpu_ida_cpu *tags;
> +	unsigned long flags;
> +	unsigned this_cpu;
> +	int tag;
> +
> +	local_irq_save(flags);

> +	this_cpu = smp_processor_id();
> +	tags = per_cpu_ptr(pool->tag_cpu, this_cpu);

tags = this_cpu_ptr(pool->tag_cpu);

> +		schedule();
> +
> +		local_irq_save(flags);
> +		this_cpu = smp_processor_id();
> +		tags = per_cpu_ptr(pool->tag_cpu, this_cpu);

And the same here.


> +void percpu_ida_free(struct percpu_ida *pool, unsigned tag)
> +{
> +	struct percpu_ida_cpu *tags;
> +	unsigned long flags;
> +	unsigned nr_free, this_cpu;
> +
> +	BUG_ON(tag >= pool->nr_tags);
> +
> +	local_irq_save(flags);
> +	this_cpu = smp_processor_id();
> +	tags = per_cpu_ptr(pool->tag_cpu, this_cpu);

And again


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