undefined reference to `efi_call'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

Hi Johannes,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   92e963f50fc74041b5e9e744c330dca48e04f08d
commit: 489c2a20a414351fe0813a727c34600c0f7292ae mm: memcontrol: introduce CONFIG_MEMCG_LEGACY_KMEM
date:   5 days ago
config: x86_64-randconfig-s0-01261658 (attached as .config)
reproduce:
        git checkout 489c2a20a414351fe0813a727c34600c0f7292ae
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/built-in.o: In function `uv_bios_call':
>> (.text+0x154307): undefined reference to `efi_call'
   arch/x86/built-in.o: In function `uv_bios_call_irqsave':
   (.text+0x154395): undefined reference to `efi_call'
   arch/x86/built-in.o: In function `uv_bios_call_reentrant':
   (.text+0x154425): undefined reference to `efi_call'
   arch/x86/built-in.o: In function `uv_bios_freq_base':
   (.text+0x15467c): undefined reference to `efi_call'
   arch/x86/built-in.o: In function `uv_bios_set_legacy_vga_target':
   (.text+0x1546d2): undefined reference to `efi_call'

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