linux-kernel - Re: [PATCH] quiet down swiotlb warnings

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Date:	Fri, 1 Jun 2007 21:37:03 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	andrew.vasquez@...gic.com
Subject: Re: [PATCH] quiet down swiotlb warnings

On Fri, Jun 01, 2007 at 07:12:25PM +0100, Christoph Hellwig wrote:
> On Fri, Jun 01, 2007 at 09:01:45PM +0200, Andi Kleen wrote:
> > Bad idea imho. swiotlb mappings should always lead to printk by default
> > because it is pretty dangerous.
> > 
> > One possible solution for this I could think of would be to define a
> > new pci_map_sg_couldfail() or similar that doesn't warn and use a weak
> > fallback just calling pci_map_sg on other IOMMU implementations. 
> 
> pci_map_sg is defined to be failing when running out of ressources, which
> is perfectly fine.  We don't printk on kmalloc failures either (actually

Actually we do as you point out.

> in some cases which is highly annoying and leads people to stick a
> __GFP_NOWARN into various places)

An pci_map_sg failing typically leads to an IO error and we've
always printk'ed those. Otherwise people will wonder why they
get EIO.

-Andi
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