rcu: Protect ->gp_flags accesses with ACCESS_ONCE()
A number of ->gp_flags accesses don't have ACCESS_ONCE(), but all of the can race against other loads or stores. This commit therefore applies ACCESS_ONCE() to the unprotected ->gp_flags accesses. Reported-by: Alexey Roytman <alexey.roytman@oracle.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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