On Mon, Jun 14, 2021 at 08:26:01AM -0700, Kees Cook wrote: > So, AFAICT, the original blocking issue ("PGO does not respect noinstr") > is not actually an issue (noinstr contains notrace, which IS respected > by PGO[2]), I think this is fine to move forward. It is *NOT*: https://godbolt.org/z/9c7xdvGd9 Look at how both compilers generate instrumentation in the no_instr() function.