linux-kernel - Re: [PATCH] rcu: rcu_segcblist.c make undeclared items static

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Date:   Tue, 15 Oct 2019 21:05:31 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:     linux-kernel@...ts.codethink.co.uk,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcu: rcu_segcblist.c make undeclared items static

On Tue, Oct 15, 2019 at 11:55:24AM +0100, Ben Dooks wrote:
> The following are not used outside the unit they are
> declared in, so make them static to avoid the following
> sparse warnings:
> 
> kernel/rcu/rcu_segcblist.c:91:6: warning: symbol 'rcu_segcblist_set_len' was not declared. Should it be static?
> kernel/rcu/rcu_segcblist.c:107:6: warning: symbol 'rcu_segcblist_add_len' was not declared. Should it be static?
> kernel/rcu/rcu_segcblist.c:137:6: warning: symbol 'rcu_segcblist_xchg_len' was not declared. Should it be static?
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>

Good catch, but commit 292d1bb2 ("rcu: Several rcu_segcblist functions
can be static") beat you to it by a month or two.  This commit is still
in -rcu, but will be part of my pull request in a couple of weeks.

See -rcu branch "dev":

	git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git

							Thanx, Paul

> ---
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Josh Triplett <josh@...htriplett.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: Lai Jiangshan <jiangshanlai@...il.com>
> Cc: Joel Fernandes <joel@...lfernandes.org>
> Cc: rcu@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  kernel/rcu/rcu_segcblist.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c
> index 495c58ce1640..cbc87b804db9 100644
> --- a/kernel/rcu/rcu_segcblist.c
> +++ b/kernel/rcu/rcu_segcblist.c
> @@ -88,7 +88,7 @@ struct rcu_head *rcu_cblist_dequeue(struct rcu_cblist *rclp)
>  }
>  
>  /* Set the length of an rcu_segcblist structure. */
> -void rcu_segcblist_set_len(struct rcu_segcblist *rsclp, long v)
> +static void rcu_segcblist_set_len(struct rcu_segcblist *rsclp, long v)
>  {
>  #ifdef CONFIG_RCU_NOCB_CPU
>  	atomic_long_set(&rsclp->len, v);
> @@ -104,7 +104,7 @@ void rcu_segcblist_set_len(struct rcu_segcblist *rsclp, long v)
>   * This increase is fully ordered with respect to the callers accesses
>   * both before and after.
>   */
> -void rcu_segcblist_add_len(struct rcu_segcblist *rsclp, long v)
> +static void rcu_segcblist_add_len(struct rcu_segcblist *rsclp, long v)
>  {
>  #ifdef CONFIG_RCU_NOCB_CPU
>  	smp_mb__before_atomic(); /* Up to the caller! */
> @@ -134,7 +134,7 @@ void rcu_segcblist_inc_len(struct rcu_segcblist *rsclp)
>   * with the actual number of callbacks on the structure.  This exchange is
>   * fully ordered with respect to the callers accesses both before and after.
>   */
> -long rcu_segcblist_xchg_len(struct rcu_segcblist *rsclp, long v)
> +static long rcu_segcblist_xchg_len(struct rcu_segcblist *rsclp, long v)
>  {
>  #ifdef CONFIG_RCU_NOCB_CPU
>  	return atomic_long_xchg(&rsclp->len, v);
> -- 
> 2.23.0
>