linux-next build error (7)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    ba0b4dfd Add linux-next specific files for 20200122
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17caa985e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7b604c617a6b217c
dashboard link: https://syzkaller.appspot.com/bug?extid=dc92421ed22129134c0f
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+dc92421ed22129134c0f@xxxxxxxxxxxxxxxxxxxxxxxxx

/syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:560: undefined reference to `__efi64_thunk'
/syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:902: undefined reference to `efi_uv1_memmap_phys_prolog'
/syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:921: undefined reference to `efi_uv1_memmap_phys_epilog'

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