[tip:WIP.x86/hpet 28/29] WARNING: vmlinux.o(.text+0x9e640): Section mismatch in reference from the function hpet_cpuhp_online() to the function .init.text:hpet_init_clockevent()

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/hpet
head:   e68a1d0fce032346dbfeca0140d90da75796bab9
commit: f16b728c11a349070f991885a7458aee91b01c5b [28/29] x86/hpet: Use common init for legacy clockevent
config: x86_64-lkp (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout f16b728c11a349070f991885a7458aee91b01c5b
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> WARNING: vmlinux.o(.text+0x9e640): Section mismatch in reference from the function hpet_cpuhp_online() to the function .init.text:hpet_init_clockevent()
   The function hpet_cpuhp_online() references
   the function __init hpet_init_clockevent().
   This is often because hpet_cpuhp_online lacks a __init
   annotation or the annotation of hpet_init_clockevent is wrong.

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