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From: Steven Rostedt <rostedt@goodmis.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Joel Fernandes <joel@joelfernandes.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC][PATCH] tracepoints: Free early tracepoints after RCU is initialized
Date: Fri, 10 Aug 2018 12:35:17 -0400	[thread overview]
Message-ID: <20180810123517.5e9714ad@gandalf.local.home> (raw)
In-Reply-To: <20180810123042.51ceddb9@gandalf.local.home>

On Fri, 10 Aug 2018 12:30:42 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

Maybe I should say SRCU?

+/* SRCU is initialized at core_initcall */
+postcore_initcall(release_early_probes);
+
 static inline void release_probes(struct tracepoint_func *old)
 {
 	if (old) {
 		struct tp_probes *tp_probes = container_of(old,
 			struct tp_probes, probes[0]);
+
+		/*
+		 * We can't free probes if SRCU is not initialized yet.
+		 * Postpone the freeing till after SRCU is initialized.
+		 */
+		if (unlikely(!ok_to_free_tracepoints)) {
+			tp_probes->rcu.next = early_probes;
+			early_probes = &tp_probes->rcu;
+			return;
+		}
+

-- Steve


  reply	other threads:[~2018-08-10 16:35 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-10 16:30 Steven Rostedt
2018-08-10 16:35 ` Steven Rostedt [this message]
2018-08-10 17:07   ` Paul E. McKenney
2018-08-10 17:06 ` Paul E. McKenney
2018-08-10 17:11 ` Joel Fernandes

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