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

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Message-ID: <20080710133136.GQ14977@amd.com>
Date:	Thu, 10 Jul 2008 15:31:36 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, Jul 10, 2008 at 06:03:51AM -0700, Andrew Morton wrote:
> 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.

Yeah ok, I agree. Thanks for your review and comments. I try to push out
the updates today.

Joerg

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