[PATCH v6 09/15] memory-hotplug: remove page table of x86_64 architecture

[Tang Chen]

This patch searches a page table about the removed memory, and clear
page table for x86_64 architecture.

Signed-off-by: Wen Congyang <wency at cn.fujitsu.com>
Signed-off-by: Jianguo Wu <wujianguo at huawei.com>
Signed-off-by: Jiang Liu <jiang.liu at huawei.com>
Signed-off-by: Tang Chen <tangchen at cn.fujitsu.com>
---
 arch/x86/mm/init_64.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index fe01116..d950f9b 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -981,6 +981,15 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
 	flush_tlb_all();
 }
 
+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)
 {
@@ -990,6 +999,7 @@ 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);
 
-- 
1.7.1