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FROMLIST: arm64: mm: update max_pfn after memory hotplug

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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.

Link: https://lore.kernel.org/lkml/cover.1632853776.git.quic_cgoldswo@quicinc.com/T/#md084740c6377eb12369bfe6eb8786f4689dc8498
Bug: 200171991
Fixes: 4ab2150615 ("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>
Change-Id: I1cb50889299957c871c498e19aa05778c7583c9d
This commit is contained in:
Sudarshan Rajagopalan
2021-09-22 15:56:36 -07:00
committed by Chris Goldsworthy
parent 477cd8fd78
commit cb7a5d58a9
1 changed files with 5 additions and 0 deletions
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5
arch/arm64/mm/mmu.c
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@@ -1506,6 +1506,11 @@ 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;
}