On 02/03/20 18:01, Jim Mattson wrote: >> And in fact, it's not used anywhere. So it should be >> deprecated. > I don't know how you can make the assertion that this ioctl is not > used anywhere. For instance, I see a use of it in Google's code base. Right, it does not seem to be used anywhere according to e.g. Debian code search but of course it can have users. What are you using it for? It's true that cpuid->nent is never written back to userspace, so the ioctl is basically unusable unless you already know how many entries are written. Or unless you fill the CPUID entries with garbage before calling it, I guess; is that what you are doing? Paolo
