Re: [PATCH 2/6] Introduce CONFIG_ZONE_DMA

[James Bottomley <James.Bottomley@xxxxxxxxxxxx>]

On Mon, 2006-09-18 at 14:55 +0100, Christoph Hellwig wrote:
> Let's pass this on to linux-arch so that the arch maintainers can give input
> whether they need ZONE_DMA or not.  If this just sneaks in unseen I'd bet
> various architectures will just keept it around despite not needing it.

Right at the moment, parisc has no use for ZONE_DMA.  We basically set
ZONE_DMA == ZONE_NORMAL.  I don't believe our 32 bit systems will ever
need it.  On the 64 bit systems currently we insist on having an IOMMU
for every transaction, so ZONE_DMA == ZONE_NORMAL still.  However, on
the zx1 systems, I can see us eventually implementing IOMMU bypass and
for that case, we might need ZONE_DMA (primarily for GFP_DMA32, I
suppose, which we could do internally).

James


-
To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html