tree 716be4cefaad976c0434a17e1cc813f6b3e69754
parent 720924f1af34671bf917586ada3f2f6fdf42a8ed
author Paul E. McKenney <paulmck@kernel.org> 1753221453 -0700
committer Paul E. McKenney <paulmck@kernel.org> 1753221453 -0700

srcu: Document srcu_flip() memory-barrier D relation to SRCU-fast

The smp_mb() memory barrier at the end of srcu_flip() has a comment,
but that comment does not make it clear that this memory barrier is an
optimization, as opposed to being needed for correctness.  This commit
therefore adds this information and points out that it is omitted
for SRCU-fast, where a much heavier weight synchronize_srcu() would
be required.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: <bpf@vger.kernel.org>