From: Anton Blanchard <[EMAIL PROTECTED]>
Date: Sat, 25 Mar 2006 23:19:29 +1100

> Previously we added NET_IP_ALIGN so an architecture can override the
> padding done to align headers. The next step is to allow the skb
> headroom to be overridden.
> 
> We currently always reserve 16 bytes to grow into, meaning all DMAs
> start 16 bytes into a cacheline. On ppc64 we really want DMA writes to
> start on a cacheline boundary, so we increase that headroom to one
> cacheline.
> 
> Signed-off-by: Anton Blanchard <[EMAIL PROTECTED]>

This seems reasonable, applied.

Thanks.
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