On 20.11.2018 3:49, Stephen Rothwell wrote:

Hi all,

After merging the regulator tree, today's linux-next build (x86_64
allmodconfig) failed like this:

ERROR: "regulator_lock" [drivers/regulator/wm8350-regulator.ko] undefined!
ERROR: "regulator_unlock" [drivers/regulator/wm8350-regulator.ko] undefined!
ERROR: "regulator_unlock" [drivers/regulator/da9210-regulator.ko] undefined!
ERROR: "regulator_lock" [drivers/regulator/da9210-regulator.ko] undefined!

Caused by commit

  f8702f9e4aa7 ("regulator: core: Use ww_mutex for regulators locking")

I have used the regulator tree from next-20181119 for today.

My bad, forgot to export these functions. That's the same issue that was reporter by the build robot earlier. Will send the fix, sorry for the inconvenience.