Re: virt_to_page for userspace pointers

[Nikolaus Rath <Nikolaus@rath.org>]

On 02/05/2011 04:36 PM, Brice Goglin wrote:
>> 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()).

Thanks for the pointer, that already helped a lot!

I would, however, prefer a more primitive function that just gives me
the struct page without locking it. And if the page is swapped out, I'd
rather get a NULL pointer than having a page frame allocated.  Is there
anything like that?

Thanks,

   -Nikolaus

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