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-rw-r--r--arch/arm64/mm/mmu.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index e661469cabdd..a21fa7e1167d 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1074,4 +1074,23 @@ int arch_add_memory(int nid, u64 start, u64 size,
return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT,
restrictions);
}
+#ifdef CONFIG_MEMORY_HOTREMOVE
+void arch_remove_memory(int nid, u64 start, u64 size,
+ struct vmem_altmap *altmap)
+{
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+ struct zone *zone;
+
+ /*
+ * FIXME: Cleanup page tables (also in arch_add_memory() in case
+ * adding fails). Until then, this function should only be used
+ * during memory hotplug (adding memory), not for memory
+ * unplug. ARCH_ENABLE_MEMORY_HOTREMOVE must not be
+ * unlocked yet.
+ */
+ zone = page_zone(pfn_to_page(start_pfn));
+ __remove_pages(zone, start_pfn, nr_pages, altmap);
+}
+#endif
#endif