---

yaml
---
r: 180183
b: refs/heads/master
c: ea08541
h: refs/heads/master
i:
  180181: 725686b
  180179: ae203fd
  180175: 2f4961d
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a225a5cc2c25e1217e68ee2ab8dd4454573fa308
+refs/heads/master: ea0854170c95245a258b386c7a9314399c949fe0

trunk/arch/x86/mm/init_64.c

@@ -49,6 +49,7 @@
 #include <asm/numa.h>
 #include <asm/cacheflush.h>
 #include <asm/init.h>
+#include <linux/bootmem.h>
 
 static unsigned long dma_reserve __initdata;
 
@@ -615,6 +616,21 @@ void __init paging_init(void)
  * Memory hotplug specific functions
  */
 #ifdef CONFIG_MEMORY_HOTPLUG
+/*
+ * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
+ * updating.
+ */
+static void  update_end_of_memory_vars(u64 start, u64 size)
+{
+	unsigned long end_pfn = PFN_UP(start + size);
+
+	if (end_pfn > max_pfn) {
+		max_pfn = end_pfn;
+		max_low_pfn = end_pfn;
+		high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+	}
+}
+
 /*
  * Memory is added always to NORMAL zone. This means you will never get
  * additional DMA/DMA32 memory.
@@ -634,6 +650,9 @@ int arch_add_memory(int nid, u64 start, u64 size)
 	ret = __add_pages(nid, zone, start_pfn, nr_pages);
 	WARN_ON_ONCE(ret);
 
+	/* update max_pfn, max_low_pfn and high_memory */
+	update_end_of_memory_vars(start, size);
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(arch_add_memory);