Re: [PATCH] arm64: mm: update max_pfn after memory hotplug
From: Anshuman Khandual <hidden>
Date: 2021-10-01 08:51:34
Also in:
linux-mm, lkml
On 9/29/21 12:21 AM, Chris Goldsworthy wrote:
From: Sudarshan Rajagopalan <redacted>
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 <redacted>
Signed-off-by: Chris Goldsworthy <redacted>
Acked-by: David Hildenbrand <redacted>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Georgi Djakov <redacted>As these variables need to be updated in the platform. Reviewed-by: Anshuman Khandual <redacted>
quoted hunk ↗ jump to hunk
--- 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; }
_______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel