Hi, > Hi Johannes and Peter, sorry to bother but I have one question > on this change. The do_ctors() won’t be executed for UML > because *the constructors have already been called for ELF*. > > *__ctors_start* and *__ctors_end* symbols. See link: > https://elixir.bootlin.com/linux/v5.12.2/source/include/asm-generic/vmlinux.lds.h#L676 > > In my environment, UML+GCC 10, I can't find __gcov_init executed > before kernel starts. So I did some trace and found glibc > __libc_csu_init > will only execute constructors between *__init_array_start*and > *__init_array_end*. > Which means if do_ctors() is not executed for UML, no elsewhere will > the constructors be executed. > > Shall we remove the *!defined(CONFIG_UML)* for GCC, or I just missed > some steps to make the GCOV work for UML? No, that doesn't seem like the right solution. Perhaps then with that toolchain (or configuration thereof) we need to provide __init_array_start/end labels? Or ... maybe that actually just needs to be removed, so that the toolchain gets to choose? Hmm. Pretty sure it worked for me, I think also with gcc 10, but not sure exactly where I tested. johannes
