memory-hotplug: remove page table of x86_64 architecture

Search a page table about the removed memory, and clear page table for
x86_64 architecture.

[[email protected]: make kernel_physical_mapping_remove() static]
Signed-off-by: Wen Congyang <[email protected]>
Signed-off-by: Jianguo Wu <[email protected]>
Signed-off-by: Jiang Liu <[email protected]>
Signed-off-by: Tang Chen <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Kamezawa Hiroyuki <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Wu Jianguo <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

arch/x86/mm/init_64.c

@@ -1011,6 +1011,15 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
 	flush_tlb_all();
 }
 
+static void __meminit
+kernel_physical_mapping_remove(unsigned long start, unsigned long end)
+{
+	start = (unsigned long)__va(start);
+	end = (unsigned long)__va(end);
+
+	remove_pagetable(start, end, true);
+}
+
 #ifdef CONFIG_MEMORY_HOTREMOVE
 int __ref arch_remove_memory(u64 start, u64 size)
 {
@@ -1020,6 +1029,7 @@ int __ref arch_remove_memory(u64 start, u64 size)
 	int ret;
 
 	zone = page_zone(pfn_to_page(start_pfn));
+	kernel_physical_mapping_remove(start, start + size);
 	ret = __remove_pages(zone, start_pfn, nr_pages);
 	WARN_ON_ONCE(ret);