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rcu: Add WRITE_ONCE to rcu_node ->exp_seq_rq store
authorPaul E. McKenney <paulmck@kernel.org>
Fri, 3 Jan 2020 20:12:06 +0000 (12:12 -0800)
committerPaul E. McKenney <paulmck@kernel.org>
Thu, 20 Feb 2020 23:58:22 +0000 (15:58 -0800)
commitb0c18c87730a4de6da0303fa99aea43e814233f9
tree31f1ab63c9331736ccd4b7aa54bfb2db389c94f4tree | snapshot
parent7672d647ddae37d2ea267159950bcc311e962434commit | diff
rcu: Add WRITE_ONCE to rcu_node ->exp_seq_rq store

The rcu_node structure's ->exp_seq_rq field is read locklessly, so
this commit adds the WRITE_ONCE() to a load in order to provide proper
documentation and READ_ONCE()/WRITE_ONCE() pairing.

This data race was reported by KCSAN.  Not appropriate for backporting
due to failure being unlikely.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
kernel/rcu/tree_exp.h diff | blob | history
ep93xx device tree rework repo: git://git.maquefel.me/linux.git