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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/