[PATCH RFC] Fix data races in timers

[Paul E. McKenney]

Hello!

In CONFIG_KCSAN_STRICT=y mode, KCSAN finds (a very few) data races,
one set on the hlist_node ->pprev field and another set on tmigr_event
structure's ->ignore field.  Therefore, fix these applying READ_ONCE()
and WRITE_ONCE().

1.	Mark updates to hlist_node ->pprev field.

2.	Mark updates to tmigr_event ->field.

						Thanx, Paul

------------------------------------------------------------------------

 include/linux/list.h          |    6 +++---
 kernel/time/timer.c           |    2 +-
 kernel/time/timer_migration.c |    6 +++---
 3 files changed, 7 insertions(+), 7 deletions(-)