linux-kernel - Re: [PATCH 14/34] AMD IOMMU: clue initialization code together

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Date:	Thu, 10 Jul 2008 06:03:51 -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 14/34] AMD IOMMU: clue initialization code together

On Thu, 10 Jul 2008 14:37:47 +0200 Joerg Roedel <joerg.roedel@....com> wrote:

> > Is there a reason for using __get_free_pages() in this manner everywhere? 
> > kmalloc() or kzalloc() are unsuitable?
> 
> Yes. The device table has to be page aligned and has a maximum size of
> 2 MB. 

OK

> > > +	if (amd_iommu_dev_table == NULL)
> > > +		goto out;
> > > +
> > > +	/*
> > > +	 * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
> > > +	 * IOMMU see for that device
> > > +	 */
> > > +	amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
> > > +			get_order(alias_table_size));
> 
> Hmm, maybe this table will fit into a kmalloc allocation. Its maximum
> size is 128 kb.

Might as well keep it all consistent in that case.

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