Messages in this thread |  | | Date | Mon, 09 Sep 2002 23:19:25 +0200 | From | Manfred Spraul <> | Subject | Re: Calculating kernel logical address .. |
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Andrew Morton wrote: > Nobody seems to have come forth to implement a thought-out scatter/gather, > map-user-pages library infrastructure so I'd be a bit reluctant to > break stuff without offering a replacement. >
We'd need one.
get_user_pages() is broken if a kernel module access the virtual address of the page and the cpu caches are not coherent: Most of the flush functions need the vma pointer, but it's impossible to guarantee that it still exists when the get_user_pages() user calls page_cache_release().
-- Manfred
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