Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

From: Keshavamurthy, Anil S
Date: Mon Jun 11 2007 - 17:44:19 EST

On Mon, Jun 11, 2007 at 02:29:56PM -0700, Christoph Lameter wrote:
> On Mon, 11 Jun 2007, Keshavamurthy, Anil S wrote:
> > Hence, can I assume that the conclusion of this
> > discussion is to use kmem_cache_alloc() functions
> > to allocate memory in dma_map_{single|sg} API's?
> Use the page allocator for page size allocations. If you need to have
> specially aligned memory in less than page sized chunks then use
> kmem_cache_alloc with a specially configured slab.

Okay, will do this change and get back to the list.

> >
> > Again, if dma_map_{single|sg} API's fails due to
> > failure to allocate memory, the only thing that can
> > be done is to panic as this is what few of the other
> > IOMMU implementation is doing today.
> Why does it have to be so severe? The I/O operation fails right?
Not sure. Also most of the callers today don;t check for failures.

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