Re: [PATCH RFC tip/core/rcu 12/15] lib/assoc_array: Remove smp_read_barrier_depends()

[David Howells]

Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> wrote:

> It does not.  In most cases, the barriered version would be
> smp_store_release().

Ummm... Is that good enough?  Is:

	WRITE_ONCE(x, 1);
	WRITE_ONCE(x, 2);

equivalent to:

	smp_store_release(x, 1);
	smp_store_release(x, 2);

if CONFIG_SMP=n?

(Consider what happens if an interrupt messes with x).

If it is good enough, should we be using smp_load_acquire() rather than
READ_ONCE()?

David