hulk inclusion
category: feature
bugzilla: 12805
CVE: NA
-------------------------------------------------

This patch is based on "arm64: perf: add nmi support for pmu" patch series.
This feature is alternative to the SDEI NMI watchdog. As we can not get
the cpu frequency, kernel cmdline parameter hardlockup_cpu_freq=xxx (in KHZ)
need to be passed by user currently. If it is not be passed, the perf NMI
watchdog will be disabled defaultly.
Signed-off-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>