linux-kernel - Re: [PATCH RFC v6 4/5] tracepoint: Make rcuidle tracepoint callers use SRCU

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Message-ID: <568999860.209.1525727141943.JavaMail.zimbra@efficios.com>
Date:   Mon, 7 May 2018 17:05:41 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Boqun Feng <boqun.feng@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        fweisbec <fweisbec@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        kbuild test robot <fengguang.wu@...el.com>,
        baohong liu <baohong.liu@...el.com>,
        vedang patel <vedang.patel@...el.com>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH RFC v6 4/5] tracepoint: Make rcuidle tracepoint callers
 use SRCU

----- On May 7, 2018, at 4:41 PM, Joel Fernandes joelaf@...gle.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 ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com