On Thu, 27 May 2021 18:50:48 +0100 Catalin Marinas [off-list ref] wrote:

quoted

Can you please try Anshuman's patch "arm64/mm: Drop HAVE_ARCH_PFN_VALID":

https://lore.kernel.org/lkml/1621947349-25421-1-git-send-email-anshuman.khandual@arm.com (local)

It seems to me that the check for memblock_is_memory() in
arm64::pfn_valid() is what makes init_unavailable_range() to bail out for
section parts that are not actually populated and then we have
VM_BUG_ON_PAGE(PagePoisoned(p)) for these pages.

I acked Anshuman's patch, I think they all need to go in together.

That's neat.   Specifically which patches are we referring to here?