Re: get_user_pages ?

[Nick Piggin <nickpiggin@yahoo.com.au>]

Mark Hounschell wrote:

> > OK, I'd suggest either using vm_insert_page, or converting it all over
> > to a ->nopage handler then.
>
>
> I set the bit back on after get_user_pages and now I seem to be OK.
>
> You've looked at the code some obviously. What is in my future WRT these
> changes being made that you referenced above and the depreciation of
> some of the calls in use. Given my situation, do you foresee anything
> that will keep me from being able to get valid bus addresses for my pte?

Well remap_pfn_range / io_remap_pfn_range is a good option, but it
shouldn't really support get_user_pages so I suspect you are just
lucky there (ie. on some platforms you might not have a struct page
for your bus address, and other times the final put_page will try
to free the page).

If you definitely have struct pages, vm_insert_page is an option,
unless the memory is allocated with dma_alloc_* or similar, in
which case you should probably be using remap_pfn_range.

--
SUSE Labs, Novell Inc.
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