On 8/5/21 7:23 AM, Peter Zijlstra wrote: > This is assuming any of this is actually performance critical, based off > of this using static_call() to begin with. This code is not performance critical. I think I sent folks off on a wild goose chase when I asked that we make an effort to optimize code that does: if (some_hyperv_check()) foo(); if (some_amd_feature_check()) bar(); with checks that will actually compile away when Hyper-V or some_amd_feature() is disabled. That's less about performance and just about good hygiene. I *wanted* to see cpu_feature_enabled(X86_FEATURE...) checks. Someone suggested using static calls, and off we went... Could we please just use cpu_feature_enabled()?
