linux-kernel - Re: [PATCH v4 0/3] dma-mapping, powerpc, nvme: introduce the DMA_ATTR_NO

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Date:	Fri, 5 Aug 2016 10:01:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>
Cc:	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-nvme@...ts.infradead.org, corbet@....net,
	rmk+kernel@....linux.org.uk, keith.busch@...el.com, axboe@...com,
	benh@...nel.crashing.org, mpe@...erman.id.au,
	k.kozlowski@...sung.com
Subject: Re: [PATCH v4 0/3] dma-mapping, powerpc, nvme: introduce the
 DMA_ATTR_NO_WARN attribute

On Fri, 5 Aug 2016 09:34:20 -0300 Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com> wrote:

> On 08/04/2016 10:05 PM, Andrew Morton wrote:
> > Of course, the alternative is to just delete the damn warnings from
> > ppc_iommu_map_sg().  Imagine that!  Have they ever been of any use to
> > anyone?
> 
> Sure. I submitted a patch to convert it to dynamic debug (so it would
> still be available if one wanted to), but it wasn't accepted [1]; so
> I guess it apparently is, in some cases.
> 
> [1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-June/144196.html
> 

Bah.  What about WARN__ON_ONCE()?  Or much heavier ratelimiting?