Patchwork [v5,09/14] memory-hotplug: remove page table of x86_64 architecture

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Submitter Tang Chen
Date Dec. 24, 2012, 12:09 p.m.
Message ID <1356350964-13437-10-git-send-email-tangchen@cn.fujitsu.com>
Download mbox | patch
Permalink /patch/208070/
State Not Applicable
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Comments

Tang Chen - Dec. 24, 2012, 12:09 p.m.
This patch searches a page table about the removed memory, and clear
page table for x86_64 architecture.

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>
---
 arch/x86/mm/init_64.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b30df3c..4b160d8 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -979,6 +979,15 @@  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)
 {
@@ -988,6 +997,7 @@  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);