[PATCH v4 0/3] dma-mapping, powerpc, nvme: introduce the DMA_ATTR_NO_WARN attribute

[Andrew Morton]

On Fri, 5 Aug 2016 09:34:20 -0300 Mauricio Faria de Oliveira <mauricfo at linux.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?