Re: How to map high memory for block io

[Pierre Ossman]

Russell King wrote:

> >
> > I don't see what the problem is.  A sg entry is a list of struct page
> > pointers, an offset, and a size.  As such, it can't describe a transfer
> > which crosses a page because such a structure does not imply that one
> > struct page follows another struct page.
> >
> >   
>   

If the pages do not strictly follow each other then there is a lot of
broken code in the kernel. drivers/mmc/mmci.c and drivers/block/ub.c
being two occurences since both assume they can access the entire entry
through a single mapping.

Rgds
Pierre


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