PR sync from: Liu Shixin liushixin2@huawei.com
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/3XTBWE45QW2ZV3SA4J4VPYCQ6Y5KKBC2/
Backport two patches which introduce vm_swap_extension sysctl.

Liu Shixin (2):
mm/vmscan: introduce vm_swap_extension sysctl
openeuler_defconfig: enable swap_extension for x86 and arm64

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2.25.1

#IAYRFE:CVE-2022-49030