From: Paul E. McKenney Date: Mon, 9 Oct 2017 18:30:11 +0000 (-0700) Subject: tracepoint: Remove smp_read_barrier_depends() from comment X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=243d1a7977ae0814aa1ccb8bb87f8a4e0822ca8f;p=linux.git tracepoint: Remove smp_read_barrier_depends() from comment The comment in tracepoint_add_func() mentions smp_read_barrier_depends(), whose use should be quite restricted. This commit updates the comment to instead mention the smp_store_release() and rcu_dereference_sched() that the current code actually uses. Signed-off-by: Paul E. McKenney Cc: Ingo Molnar Acked-by: Steven Rostedt (VMware) Acked-by: Mathieu Desnoyers --- diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 685c50ae63000..671b134573876 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -212,11 +212,10 @@ static int tracepoint_add_func(struct tracepoint *tp, } /* - * rcu_assign_pointer has a smp_wmb() which makes sure that the new - * probe callbacks array is consistent before setting a pointer to it. - * This array is referenced by __DO_TRACE from - * include/linux/tracepoints.h. A matching smp_read_barrier_depends() - * is used. + * rcu_assign_pointer has as smp_store_release() which makes sure + * that the new probe callbacks array is consistent before setting + * a pointer to it. This array is referenced by __DO_TRACE from + * include/linux/tracepoint.h using rcu_dereference_sched(). */ rcu_assign_pointer(tp->funcs, tp_funcs); if (!static_key_enabled(&tp->key))