linux-kernel - undefined reference to `efi

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Date:	Wed, 10 Feb 2016 16:48:28 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: undefined reference to `efi_call'

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'

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