Re: undefined reference to `efi_call'

[Andrew Morton]

On Wed, 10 Feb 2016 16:48:28 +0800 kbuild test robot <fengguang.wu@xxxxxxxxx> wrote:

> 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:   2178cbc68f3602dc0b5949b9be2c8383ad3d93ef
> commit: 489c2a20a414351fe0813a727c34600c0f7292ae mm: memcontrol: introduce CONFIG_MEMCG_LEGACY_KMEM
> date:   3 weeks ago
> config: x86_64-randconfig-s3-02101458 (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+0xeba00): undefined reference to `efi_call'

I'd be surprised if the above patch caused this.

CONFIG_EFI=n

CONFIG_X86_UV does not depend on EFI.