Ben,
If we have CONFIG_DEBUG_PAGEALLOC enabled we end up hitting the
WARN_ON() in set_pte_at() when we boot. This appears because we've
already setup pte's via mapin_ram() after which we end up calling
kernel_map_pages().
So I'm not sure if __change_page_attr() should be doing something
different or if the WARN_ON() should be conditional on !
CONFIG_DEBUG_PAGEALLOC
- k
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