On Mon, Apr 26, 2021, Reiji Watanabe wrote: > > There is also a kernel bug lurking; vgetcpu_cpu_init() doesn't check > > X86_FEATURE_RDPID and will fail to initialize MSR_TSC_AUX if RDPID is supported > > but RDTSCP is not, and __getcpu() uses RDPID. I'll verify that's broken and > > send a patch for that one too. > > I don't find vgetcpu_cpu_init() or __getcpu() in > https://github.com/torvalds/linux. > I would assume you meant setup_getcpu() and vdso_read_cpunode() instead (?). Ya, I was looking at an old kernel when I typed that up. Bug is still there though :-)
