On Thu, 21 Jul 2022 20:55:09 +0100 Ben Dooks <ben-linux@xxxxxxxxx> wrote: > The setup_profiling_timer() is mostly un-implemented by many > architectures. In many places it isn't guarded by CONFIG_PROFILE > which is needed for it to be used. Make it a weak symbol in > kernel/profile.c and remove the 'return -EINVAL' implementations > from the kenrel. > > There are a couple of architectures which do return 0 from > the setup_profiling_timer() function but they don't seem to > do anything else with it. To keep the /proc compatibility for > now, leave these for a future update or removal. > > On ARM, this fixes the following sparse warning: > arch/arm/kernel/smp.c:793:5: warning: symbol 'setup_profiling_timer' was not declared. Should it be static? I'll grab this. We have had some problems with weak functions lately. See https://lore.kernel.org/all/87ee0q7b92.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/T/#u Hopefully that was a rare corner case.
