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Date:   Mon, 8 Feb 2021 01:13:56 +0000
From:   Chris Down <chris@chrisdown.name>
To:     kernel test robot <lkp@intel.com>
Cc:     linux-kernel@vger.kernel.org, kbuild-all@lists.01.org,
        Petr Mladek <pmladek@suse.com>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        John Ogness <john.ogness@linutronix.de>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
        kernel-team@fb.com
Subject: Re: [PATCH] printk: Userspace format enumeration support
Message-ID: <YCCQVDSl4eN7x6Yb@chrisdown.name>
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 <202102080635.uqNxyQZp-lkp@intel.com>
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kernel test robot writes:
>All errors (new ones prefixed by >>):
>
>   /usr/bin/ld: arch/um/drivers/xterm.o: in function `xterm_open':
>>> xterm.c:(.text+0x16b): undefined reference to `printk'
>>> /usr/bin/ld: xterm.c:(.text+0x1a8): undefined reference to `printk'
>   /usr/bin/ld: xterm.c:(.text+0x1f4): undefined reference to `printk'
>   /usr/bin/ld: xterm.c:(.text+0x25e): undefined reference to `printk'
>   /usr/bin/ld: xterm.c:(.text+0x2b5): undefined reference to `printk'
>   /usr/bin/ld: arch/um/drivers/xterm.o:xterm.c:(.text+0x31c): more undefined references to `printk' follow
>   collect2: error: ld returned 1 exit status

Ah yes, since it just uses it as extern. I'll fix it for v2.