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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)
commit49ee868cf1aa43950c3fde39425a9468cd1d4723
tree31f1ab63c9331736ccd4b7aa54bfb2db389c94f4tree | snapshot
parentf4b57d0fe4e095e7b7dc8895e11e7b1af450ecc9commit | 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
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