With Arnd's script [1] help, I found some bugfixes in Spreadtrum 4.14 product kernel, but missing in v4.14.146:
513e1073d52e locking/lockdep: Add debug_locks check in __lock_downgrade() 957063c92473 pinctrl: sprd: Use define directive for sprd_pinconf_params values 87a2b65fc855 power: supply: sysfs: ratelimit property read error message
[1] https://lore.kernel.org/lkml/20190322154425.3852517-19-arnd@arndb.de/T/
Changes from v2: - Drop 2 unnecessary patches (patch 1 and patch 6) from v2 patch set. - Backport these patches to 4.19.y.
Changes from v1: - Drop 2 unnecessary patches (patch 1 and patch 4) from v1 patch set. - Add upstream commit id in change log for each stable patch.
David Lechner (1): power: supply: sysfs: ratelimit property read error message
Nathan Chancellor (1): pinctrl: sprd: Use define directive for sprd_pinconf_params values
Waiman Long (1): locking/lockdep: Add debug_locks check in __lock_downgrade()
drivers/pinctrl/sprd/pinctrl-sprd.c | 6 ++---- drivers/power/supply/power_supply_sysfs.c | 3 ++- kernel/locking/lockdep.c | 3 +++ 3 files changed, 7 insertions(+), 5 deletions(-)