tree 9f86c585fad2a69e0085e77448dbecbdc896e6be
parent bb6d3fb354c5ee8d6bde2d576eb7220ea09862b9
author Paul E. McKenney <paulmck@kernel.org> 1577071974 -0800
committer Paul E. McKenney <paulmck@kernel.org> 1582243271 -0800

srcu: Fix __call_srcu()/process_srcu() datarace

The srcu_node structure's ->srcu_gp_seq_needed_exp field is accessed
locklessly, so updates must use WRITE_ONCE().  This commit therefore
adds the needed WRITE_ONCE() invocations.

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>