From bbcab8789d4a5b942773aa7496794ceebe2d3f78 Mon Sep 17 00:00:00 2001
From: Tang Chen <tangchen@cn.fujitsu.com>
Date: Fri, 22 Feb 2013 16:33:06 -0800
Subject: [PATCH] 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.
[akpm@linux-foundation.org: make kernel_physical_mapping_remove() static]
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/x86/mm/init_64.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index ca6cd403a275..4e58b83e6b2e 100644
--- a/arch/x86/mm/init_64.c
+++ b/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);
--
2.34.1