linux-kernel - Re: [PATCH v7 01/10] tracing: Add support for SOFT

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Message-ID: <20130827160150.36f10869@gandalf.local.home>
Date:	Tue, 27 Aug 2013 16:01:50 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:	masami.hiramatsu.pt@...achi.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 01/10] tracing: Add support for SOFT_DISABLE to
 syscall events

On Tue, 27 Aug 2013 14:40:13 -0500
Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:

  		return;
> -	if (!test_bit(syscall_nr, tr->enabled_enter_syscalls))
> +
> +	/* Here we're inside the tp handler's rcu_read_lock (__DO_TRACE()) */
> +	ftrace_file = rcu_dereference_raw(tr->enter_syscall_files[syscall_nr]);

What's the reason for using rcu_dereference_raw() and not normal
rcu_dereference?

-- Steve

> +	if (!ftrace_file)
> +		return;
> +
> +	if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
>  		return;
>  
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