linux-kernel - Re: [PATCH 22/34] AMD IOMMU: add domain allocation and deallocation functions

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Message-Id: <20080709191459.673a9a4c.akpm@linux-foundation.org>
Date:	Wed, 9 Jul 2008 19:14:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	Sebastian.Biemueller@....com, robert.richter@....com,
	joro@...tes.org
Subject: Re: [PATCH 22/34] AMD IOMMU: add domain allocation and deallocation
 functions

On Thu, 26 Jun 2008 21:27:58 +0200 Joerg Roedel <joerg.roedel@....com> wrote:

> +static u16 domain_id_alloc(void)
> +{
> +	unsigned long flags;
> +	int id;
> +
> +	write_lock_irqsave(&amd_iommu_devtable_lock, flags);
> +	id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
> +	BUG_ON(id == 0);
> +	if (id > 0 && id < MAX_DOMAIN_ID)
> +		__set_bit(id, amd_iommu_pd_alloc_bitmap);
> +	else
> +		id = 0;
> +	write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
> +
> +	return id;
> +}

Presumably this is not performance-critical.  If it is, an IDR
tree would help.
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