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From: Joel Fernandes <joel@joelfernandes.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Joel Fernandes <joelaf@google.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	rostedt <rostedt@goodmis.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Tom Zanussi <tom.zanussi@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Boqun Feng <boqun.feng@gmail.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	fweisbec <fweisbec@gmail.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	kbuild test robot <fengguang.wu@intel.com>,
	baohong liu <baohong.liu@intel.com>,
	vedang patel <vedang.patel@intel.com>,
	kernel-team <kernel-team@android.com>
Subject: Re: [PATCH RFC v6 4/5] tracepoint: Make rcuidle tracepoint callers use SRCU
Date: Mon, 7 May 2018 14:46:11 -0700	[thread overview]
Message-ID: <20180507214611.GB13787@joelaf.mtv.corp.google.com> (raw)
In-Reply-To: <568999860.209.1525727141943.JavaMail.zimbra@efficios.com>

On Mon, May 07, 2018 at 05:05:41PM -0400, Mathieu Desnoyers wrote:
> ----- On May 7, 2018, at 4:41 PM, Joel Fernandes joelaf@google.com wrote:
> [...]
> > +extern struct srcu_struct tracepoint_srcu;
> > +
> > extern int
> > tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
> > extern int
> > @@ -77,6 +80,9 @@ int unregister_tracepoint_module_notifier(struct
> > notifier_block *nb)
> >  */
> > static inline void tracepoint_synchronize_unregister(void)
> > {
> > +#ifdef CONFIG_TRACEPOINTS
> > +	synchronize_srcu(&tracepoint_srcu);
> > +#endif
> > 	synchronize_sched();
> 
> Why is this ifdef needed ?

tracepoint_srcu is defined in tracepoint.c so if we don't protect usage here, it
would cause a build error.

thanks,

- Joel

  reply	other threads:[~2018-05-07 21:46 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-07 20:41 [PATCH RFC v6 0/5] Centralize and unify usage of preempt/irq tracepoints Joel Fernandes
2018-05-07 20:41 ` [PATCH RFC v6 1/5] srcu: Add notrace variants of srcu_read_{lock,unlock} Joel Fernandes
2018-05-07 20:41 ` [PATCH RFC v6 2/5] srcu: Add notrace variant of srcu_dereference Joel Fernandes
2018-05-07 20:41 ` [PATCH RFC v6 3/5] trace/irqsoff: Split reset into separate functions Joel Fernandes
2018-05-07 20:41 ` [PATCH RFC v6 4/5] tracepoint: Make rcuidle tracepoint callers use SRCU Joel Fernandes
2018-05-07 21:05   ` Mathieu Desnoyers
2018-05-07 21:46     ` Joel Fernandes [this message]
2018-05-08  0:37       ` Mathieu Desnoyers
2018-05-08 21:10         ` Joel Fernandes
2018-05-07 21:08   ` Paul E. McKenney
2018-05-07 21:17     ` Mathieu Desnoyers
2018-05-07 21:45     ` Joel Fernandes
2018-05-07 21:55       ` Paul E. McKenney
2018-05-07 23:37         ` Joel Fernandes
2018-05-07 20:41 ` [PATCH RFC v6 5/5] tracing: Centralize preemptirq tracepoints and unify their usage Joel Fernandes

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