On Thu, Jan 11, 2018 at 5:31 PM, Tetsuo Handa
<penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
>
> Thus, I suspect that somewhere is confusing HighMem pages and !HighMem pages.
Hmm. I can't even imagine how you'd do that.
Sure, if you take page_address() to get a kmap'ed linear address, and
then feed that linear address back to virt_to_page(), you'd certainly
get a crazy page. But that would be insane.. I don't see how you'd do
that.
Hmm. Do you have CONFIG_DEBUG_VIRTUAL enabled? That should catch at
least the above case, it should enable a debugging version of
__virt_to_phys() and use it.
Linus
