linux-kernel - Re: [PATCH] rcu: define tracepoint strings only if CONFIG

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Date:	Fri, 11 Jul 2014 08:12:40 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	dipankar@...ibm.com
Subject: Re: [PATCH] rcu: define tracepoint strings only if CONFIG_TRACING is
 set

On Fri, Jul 11, 2014 at 01:38:12PM +0200, Ard Biesheuvel wrote:
> Commit f7f7bac9cb1c ("rcu: Have the RCU tracepoints use the tracepoint_string
> infrastructure") unconditionally populates the __tracepoint_str input section,
> but this section is not assigned an output section if CONFIG_TRACING is not set.
> This results in the __tracepoint_str turning up in unexpected places, i.e.,
> after _edata.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: rostedt@...dmis.org
> Cc: dipankar@...ibm.com
> Cc: paulmck@...ux.vnet.ibm.com

If you get a Reviewed-by from Steven Rostedt, I will be happy to queue
this one.

							Thanx, Paul

> ---
>  kernel/rcu/tree.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index f1ba77363fbb..ac1984149eb5 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -79,9 +79,16 @@ static struct lock_class_key rcu_fqs_class[RCU_NUM_LVLS];
>   * the tracing userspace tools to be able to decipher the string
>   * address to the matching string.
>   */
> +#ifdef CONFIG_TRACING
> +#define DEFINE_TPS(sname) \
> +static const char *tp_##sname##_varname __used __tracepoint_string = sname##_varname;
> +#else
> +#define DEFINE_TPS(sname)
> +#endif
> +
>  #define RCU_STATE_INITIALIZER(sname, sabbr, cr) \
>  static char sname##_varname[] = #sname; \
> -static const char *tp_##sname##_varname __used __tracepoint_string = sname##_varname; \
> +DEFINE_TPS(sname) \
>  struct rcu_state sname##_state = { \
>  	.level = { &sname##_state.node[0] }, \
>  	.call = cr, \
> -- 
> 1.8.3.2
> 

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