Re: [PATCH] arm64: mm: update max_pfn after memory hotplug

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On 9/28/2021 9:51 PM, Chris Goldsworthy wrote:
From: Sudarshan Rajagopalan <quic_sudaraja@xxxxxxxxxxx>

After new memory blocks have been hotplugged, max_pfn and max_low_pfn
needs updating to reflect on new PFNs being hot added to system.
Without this patch, debug-related functions that use max_pfn such as
get_max_dump_pfn() or read_page_owner() will not work with any page in
memory that is hot-added after boot.

Fixes: 4ab215061554 ("arm64: Add memory hotplug support")
Signed-off-by: Sudarshan Rajagopalan <quic_sudaraja@xxxxxxxxxxx>
Signed-off-by: Chris Goldsworthy <quic_cgoldswo@xxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>

Tested-by: Georgi Djakov <quic_c_gdjako@xxxxxxxxxxx>

Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Georgi Djakov <quic_c_gdjako@xxxxxxxxxxx>
---
  arch/arm64/mm/mmu.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index cfd9deb..fd85b51 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1499,6 +1499,11 @@ int arch_add_memory(int nid, u64 start, u64 size,
  	if (ret)
  		__remove_pgd_mapping(swapper_pg_dir,
  				     __phys_to_virt(start), size);
+	else {
+		max_pfn = PFN_UP(start + size);
+		max_low_pfn = max_pfn;
+	}
+
  	return ret;
  }




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