Re: kernel vaddr -> struct page

[Brian Gerst]

Eric Barton wrote:
> Hi,
> 
> I'm trying to turn a kernel virtual address into a struct page that I can
> then pass to tcp_sendpage().  
> 
> The kernel virtual address could be {kmalloc(),vmalloc(),kmap()}-ed memory,
> and I guarantee that this memory will not be {kfree(),vfree(),kunmap()}-ed
> until the socket has done with the page (i.e. all the data has been acked).
> 
> I'd have thought that vmalloc_to_page(kvaddr) should give me a page I could
> use, since it is walking the page tables to find the pte for 'kvaddr', and
> checking that the physical page is present.
> 
> However I find I'm sending garbage when I use this method.
> 
> Can anyone help me understand?
> 

virt_to_page()

--
				Brian Gerst