Re: [PATCH] tty: fix race between flush_to_ldisc and tty_open

[kbuild test robot]

Hi Li,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tty/tty-testing]
[also build test ERROR on v4.20-rc7 next-20181221]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Li-RongQing/tty-fix-race-between-flush_to_ldisc-and-tty_open/20181222-030046
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> ERROR: "tty_ldisc_unlock" [drivers/staging/speakup/speakup.ko] undefined!

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0-DAY kernel test infrastructure                Open Source Technology Center
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