linux-kernel - Re: [PATCH 07/16] iommu/amd: Add IRTE invalidation routine

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Date:	Fri, 28 Sep 2012 17:36:29 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/16] iommu/amd: Add IRTE invalidation routine

On Fri, Sep 28, 2012 at 10:20:18AM -0400, Konrad Rzeszutek Wilk wrote:
> On Fri, Sep 28, 2012 at 02:23:57PM +0200, Joerg Roedel wrote:
> > +static void iommu_flush_irt_all(struct amd_iommu *iommu)
> > +{
> > +	u32 devid;
> > +
> > +	for (devid = 0; devid <= 0xffff; ++devid)
> 
> Should this be #define? Or perhaps based of sizeof?

I'll add a define for that. The 0xffff is a hardware constant, so sizeof
will not work.

> Is there a specific reason that it is u16 in the build_inv_irt but
> here it is u32?

Yes, with u16 the loop-counter will overflow and make it to an endless
loop.


	Joerg

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