On Mon, Oct 21, 2019 at 07:49:55AM +0800, Yi Wang wrote:
> We get these warnings when build kernel W=1:
> kernel/rcu/rcu_segcblist.c:91:6: warning: no previous prototype for ‘rcu_segcblist_set_len’ [-Wmissing-prototypes]
> kernel/rcu/rcu_segcblist.c:107:6: warning: no previous prototype for ‘rcu_segcblist_add_len’ [-Wmissing-prototypes]
> kernel/rcu/rcu_segcblist.c:137:6: warning: no previous prototype for ‘rcu_segcblist_xchg_len’ [-Wmissing-prototypes]
>
> Commit eda669a6a2c5 ("rcu/nocb: Atomic ->len field in rcu_segcblist
> structure") introduced this, and make the functions static to fix
> them.
>
> Signed-off-by: Yi Wang <wang.yi59@xxxxxxxxxx>
Good catch!
However, both Ben Dooks, commit 292d1bb2 ("rcu: Several rcu_segcblist
functions can be static"), and ultimately the kbuild test robot beat
you to it. This commit is still in -rcu, but will be part of my pull
request to -tip in a couple of weeks.
Thanx, Paul
> ---
> 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 495c58c..cbc87b8 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);
> --
> 1.8.3.1
>
