linux-kernel - Re: [PATCH v2 3/3] rcu: validate arguments for rcu tracepoints

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Message-ID: <20190326112958.2668a4a1@gandalf.local.home>
Date:   Tue, 26 Mar 2019 11:29:58 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     Yafang Shao <laoar.shao@...il.com>, mingo@...hat.com,
        peterz@...radead.org, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org, linux-kernel@...r.kernel.org,
        shaoyafang@...iglobal.com
Subject: Re: [PATCH v2 3/3] rcu: validate arguments for rcu tracepoints

On Tue, 26 Mar 2019 08:18:15 -0700
"Paul E. McKenney" <paulmck@...ux.ibm.com> wrote:

> On Tue, Mar 26, 2019 at 08:13:11PM +0800, Yafang Shao wrote:
> > When CONFIG_RCU_TRACE is not set, all these tracepoints are defined as
> > do-nothing macro.
> > We'd better make those inline functions that take proper arguments.
> > 
> > As RCU_TRACE() is defined as do-nothing marco as well when
> > CONFIG_RCU_TRACE is not set, so we can clean it up.  
> 
> How about this for the commit log?
> 
> 	Unless the CONFIG_RCU_TRACE kconfig option is set, almost all
> 	of RCU's tracepoints are defined as empty macros.  It would
> 	be better if these tracepoints could instead be empty inline
> 	functions with proper arguments and type checking.  It would
> 	also be good to get rid of the RCU_TRACE() macro, which
> 	compiles its argument in CONFIG_RCU_TRACE=y kernels and
> 	omits them otherwise.
> 
> 	This commit therefore creates a TRACE_EVENT_RCU macro that
> 	is defined as TRACE_EVENT in CONFIG_RCU_TRACE=y kernels and
> 	as the new TRACE_EVENT_NOP otherwise, which allows the
> 	empty macros and the RCU_TRACE() macro to be eliminated.
> 
> With that:
> 
> Reviewed-by: Paul E. McKenney <paulmck@...ux.ibm.com>

Yafang,

If you are OK with the above changes, I'll take this patch with the
updated change log.

-- Steve