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Date: Wed, 10 Feb 2016 11:52:34 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: kbuild test robot <fengguang.wu@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>, kbuild-all@01.org,
        linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
        Linux Memory Management List <linux-mm@kvack.org>,
        Matt Fleming <matt@codeblueprint.co.uk>, Ingo Molnar <mingo@elte.hu>,
        "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: undefined reference to `efi_call'
Message-Id: <20160210115234.234e2bab71db2028c98b58ad@linux-foundation.org>
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On Wed, 10 Feb 2016 16:48:28 +0800 kbuild test robot <fengguang.wu@intel.com> 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.