From: Sudarshan Rajagopalan quic_sudaraja@quicinc.com
[ Upstream commit 8fac67ca236b961b573355e203dbaf62a706a2e5 ]
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@quicinc.com Signed-off-by: Chris Goldsworthy quic_cgoldswo@quicinc.com Acked-by: David Hildenbrand david@redhat.com Cc: Florian Fainelli f.fainelli@gmail.com Cc: Georgi Djakov quic_c_gdjako@quicinc.com Tested-by: Georgi Djakov quic_c_gdjako@quicinc.com Link: https://lore.kernel.org/r/a51a27ee7be66024b5ce626310d673f24107bcb8.163285377... Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 9ff0de1b2b93c..90d185853e341 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; }