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. -- Cheers, Stephen Rothwell