kldload hwpmc.ko fails with link_elf_obj: symbol linker_hwpmc_list_objects undefined

[Kris Kennaway]

Xin LI wrote:
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> Dear colleagues,
> 
> With a fresh 7.0-BETA3 build it seems to be unable to load hwpmc.ko into
> kernel.  I got this:
> 
> link_elf_obj: symbol linker_hwpmc_list_objects undefined
> 
> and it seems that the symbol depends on HWPMC_HOOKS.  Shall we provide
> some mechanism to prevent building hwpmc.ko if it is not defined, or
> make it a default option for GENERIC?

Adding it in GENERIC is probably reasonable.

Kris