hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I40AXF
CVE: NA

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To make sure there are no other userspace threads access the memory
region we are swapping out, we need unmmap the memory region, map it
to a new address and use the new address to perform the swapout. We add
a new flag 'MAP_REPLACE' for mmap() to unmap the pages of the input
parameter 'VA' and remap them to a new tmpVA.
Signed-off-by: NGuo Fan <guofan5@huawei.com>
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Ntong tiangen <tongtiangen@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>