tree ceb4bed59015375b8b0bb46a9416100e16abe7f6
parent 6e68b781388cfaca95a07493a060c4a6e4ee5d0f
author Paul E. McKenney <paulmck@kernel.org> 1641321274 -0800
committer Paul E. McKenney <paulmck@kernel.org> 1641321274 -0800

rcu: Mark writes to the rcu_segcblist structure's ->flags field

KCSAN reports data races between the rcu_segcblist_clear_flags() and
rcu_segcblist_set_flags() functions, though misreporting the latter
as a call to rcu_segcblist_is_enabled() from call_rcu().  This commit
converts the updates of this field to WRITE_ONCE(), relying on the
resulting unmarked reads to continue to detect buggy concurrent writes
to this field.

Reported-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>