diff options
| author | Wen Congyang <wency@cn.fujitsu.com> | 2013-02-07 12:26:26 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2013-02-14 15:25:18 +1100 |
| commit | ada1abdec7059d900db01574ef2eceaee356ea6f (patch) | |
| tree | 051b3c03e1ac4058db8b2b2d5f72c45ee6d9a0be /include/linux | |
| parent | 1e3059b17cc391b88864c75652850e257f5a5700 (diff) | |
memory-hotplug: common APIs to support page tables hot-remove
When memory is removed, the corresponding pagetables should alse be
removed. This patch introduces some common APIs to support vmemmap
pagetable and x86_64 architecture pagetable removing.
All pages of virtual mapping in removed memory cannot be freed if some
pages used as PGD/PUD includes not only removed memory but also other
memory. So the patch uses the following way to check whether page can be
freed or not.
1. When removing memory, the page structs of the removed memory are filled
with 0FD.
2. All page structs are filled with 0xFD on PT/PMD, PT/PMD can be cleared.
In this case, the page used as PT/PMD can be freed.
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/bootmem.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index 3cd16ba82f15..cdc3bab01832 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -53,6 +53,7 @@ extern void free_bootmem_node(pg_data_t *pgdat, unsigned long size); extern void free_bootmem(unsigned long physaddr, unsigned long size); extern void free_bootmem_late(unsigned long physaddr, unsigned long size); +extern void __free_pages_bootmem(struct page *page, unsigned int order); /* * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE, |