maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7R4EN
CVE: NA
Reference: https://www.spinics.net/lists/arm-kernel/msg851005.html

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Introduce framework to turn an IPI as NMI using pseudo NMIs. The main
motivation for this feature is to have an IPI that can be leveraged to
invoke NMI functions on other CPUs.

And current prospective users are NMI backtrace and KGDB CPUs round-up
whose support is added via future patches.
Signed-off-by: NSumit Garg <sumit.garg@linaro.org>
Signed-off-by: NWei Li <liwei391@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: NRuan Jinjie <ruanjinjie@huawei.com>