CVE-2022-49781 perf/x86/amd: Fix crash due to race between amd_pmu_enable_all, perf NMI and throttling

In the Linux kernel, the following vulnerability has been resolved: perf/x86/amd: Fix crash due to race between amdpmuenableall, perf NMI and throttling amdpmuenableall does: if !testbitidx, cpuc-activemask continue; amdpmuenableeventcpuc-eventsidx; A perf NMI of another event can come between...