linux-kernel - Re: [PATCH 7/5 v4] tracing: Make sure rcu_irq_enter() can work for trace_*

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Message-ID: <20170407154304.10a33c8c@gandalf.local.home>
Date:   Fri, 7 Apr 2017 15:43:04 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 7/5 v4] tracing: Make sure rcu_irq_enter() can work for
 trace_*_rcuidle() trace events

On Fri, 7 Apr 2017 15:41:17 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:
 
>  #ifndef MODULE
> -#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)	\
> +#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args) \
>  	static inline void trace_##name##_rcuidle(proto)		\
>  	{								\
>  		if (static_key_false(&__tracepoint_##name.key))		\
>  			__DO_TRACE(&__tracepoint_##name,		\
>  				TP_PROTO(data_proto),			\
>  				TP_ARGS(data_args),			\
> -				TP_CONDITION(cond),			\
> -				rcu_irq_enter_irqson(),			\
> -				rcu_irq_exit_irqson());			\
> +				TP_CONDITION(cond),1);			\

I'm going to update this patch to add a space before the 1.

>  	}
>  #else
>  #define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)
> @@ -186,7 +189,7 @@ extern void syscall_unregfunc(void);
>  			__DO_TRACE(&__tracepoint_##name,		\
>  				TP_PROTO(data_proto),			\
>  				TP_ARGS(data_args),			\
> -				TP_CONDITION(cond),,);			\
> +				TP_CONDITION(cond),0);			\

And before the 0.

-- Steve

>  		if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) {		\
>  			rcu_read_lock_sched_notrace();			\
>  			rcu_dereference_sched(__tracepoint_##name.funcs);\