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Subjectkernel vaddr -> struct page


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?



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