>>> Lennart Poettering <lenn...@poettering.net> schrieb am 13.05.2019 um 09:45 in Nachricht <20190513074503.GB9036@gardel-login>: > On Mo, 13.05.19 09:18, Ulrich Windl (ulrich.wi...@rz.uni‑regensburg.de) wrote: > > Please guys, stop it. > >> > cpuid has *nothing* to do with /proc/cpuinfo >> > >> > https://en.wikipedia.org/wiki/CPUID >> > The CPUID instruction (identified by a CPUID opcode) is a processor >> > supplementary instruction >> >> Isn't it about to check a CPU's feature depending on the CPU model? > > Ulrich, please understand that __get_cpuid() (which the discussion > here is about) is a gcc and llvm/clang feature weare are just making > use of. It used by various Linux software, and apparently doesn't work > entirely correctly on all CPUs in some corner case. The discussion is > about fixing gcc accordingly, and making it work, so that systemd all > all other software can work correctly. > > If you think that gcc/llvm are bad for "reimplementing /proc/cpuinfo" > then please bring that up with those communities, but please stop > these fruitless discussions here.
The point I was trying to make was: "CPUID" and the model-specific registers (thus the name) depend very much on the CPU being used. While the kernel makes grat efforts to get things right, I wondered whether it's the best idea whether to repeat that effort in an application program. Regards, Ulrich _______________________________________________ systemd-devel mailing list firstname.lastname@example.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel