Messages in this thread | | | Date | Sat, 05 Feb 2011 22:36:22 +0100 | From | Brice Goglin <> | Subject | Re: virt_to_page for userspace pointers |
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Le 05/02/2011 22:04, Nikolaus Rath a écrit : > Nikolaus Rath <Nikolaus@rath.org> writes: > >> Is there a way that my own kernel module can "reverse" this mmap call? >> I.e. given the userspace pointer, how do I get access to the physical >> location of the memory that has been mapped? >> > Ok, after some studying I think I can ask the question in a better way: > > Is there an equivalent function to virt_to_page (and virt_to_phys) that > works with userspace pointers? Or do I have to manually walk through the > page tables? In the later case, are there any examples of this kind of > search that I could use as a basis? >
You probably want get_user_pages() (or get_user_pages_fast()).
Brice
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