Scatterlist chaining (why scatterlist needs to fit into single page)

Scatterlist chaining (why scatterlist needs to fit into single page)

Posted Jun 12, 2007 14:52 UTC (Tue) by tom.tuytschaever (guest, #45731)
Parent article: Scatterlist chaining

> For various reasons, scatterlists must fit within a single page

What would these reasons be (in short) ?
Is is because of the way that dma_map_sg & dma_unmap_sg are implemented ?

Or is it because it is harder to allocate more than one page contiguously in memory ? Couldn't really find this in article http://lwn.net/Articles/233599/

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