Hello Mattias, Thanks for the test. > I've just applied this patchset to 2.6.19-rc2. If I enable "Processor > type and features / Support for hot-pluggable CPUs (EXPERIMENTAL)", the > coretemp driver no longer compiles (not as module and not compiled into > the kernel). Please do not include the binary attachments, the mailing list will throw such mails away... >coretemp.c:(.init.text+0x6e0d): undefined reference to >`register_hotcpu_notifier' >drivers/built-in.o: In function `coretemp_exit': >coretemp.c:(.exit.text+0x82f): undefined reference to >`unregister_hotcpu_notifier' >make: *** [.tmp_vmlinux1] Fehler 1 Hmm I tried with the rc2 and it does work. (it reports just a complain about missing function prototype - I fixed that). Please can you send me your .config file? Maybe you need to make clean; before doing the test? Thanks, Rudolf