WARNING: vmlinux.o(.text+0xc816b): Section mismatch in reference from the function pti_clone_pgtable() to the function .init.text:pti_user_pagetable_walk_pte()

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   420f51f4ab6bce6e580390729fadb89c31123636
commit: 269777aa530f3438ec1781586cdac0b5fe47b061 cpu/hotplug: Non-SMP machines do not make use of booted_once
date:   3 weeks ago
config: i386-randconfig-b0-09011544 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 269777aa530f3438ec1781586cdac0b5fe47b061
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

>> WARNING: vmlinux.o(.text+0xc816b): Section mismatch in reference from the function pti_clone_pgtable() to the function .init.text:pti_user_pagetable_walk_pte()
   The function pti_clone_pgtable() references
   the function __init pti_user_pagetable_walk_pte().
   This is often because pti_clone_pgtable lacks a __init
   annotation or the annotation of pti_user_pagetable_walk_pte is wrong.

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