Re: [PATCH] rcuperf: fix duplicate struct initializer

From: Paul E. McKenney
Date: Wed Apr 19 2017 - 14:15:58 EST


On Wed, Apr 19, 2017 at 07:14:34PM +0200, Arnd Bergmann wrote:
> Building with "make W=1" shows a set of new warnings in the rcuperf code:
>
> kernel/rcu/rcuperf.c:282:11: error: initialized field overwritten [-Werror=override-init]
> .async = srcu_call_rcu,
> kernel/rcu/rcuperf.c:282:11: note: (near initialization for 'sched_ops.async')
> kernel/rcu/rcuperf.c:283:16: error: initialized field overwritten [-Werror=override-init]
> .gp_barrier = srcu_rcu_barrier,
> kernel/rcu/rcuperf.c:283:16: note: (near initialization for 'sched_ops.gp_barrier')
> kernel/rcu/rcuperf.c:313:11: error: initialized field overwritten [-Werror=override-init]
> .async = call_rcu_tasks,
> kernel/rcu/rcuperf.c:313:11: note: (near initialization for 'tasks_ops.async')
> kernel/rcu/rcuperf.c:314:16: error: initialized field overwritten [-Werror=override-init]
> .gp_barrier = rcu_barrier_tasks,
> kernel/rcu/rcuperf.c:314:16: note: (near initialization for 'tasks_ops.gp_barrier')
>
> This appears to be a copy-paste bug, so we can remove the extranous copy.
>
> Fixes: f743d20f2cc6 ("rcuperf: Add ability to performance-test call_rcu() and friends")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

For those times when you want to be -really- sure that the field is in
fact initialized! ;-)

Good catch!!! I merged this into the original commit with attribution:

[ paulmck: Removed the redundant initialization noted by Arnd Bergmann. ]

Thanx, Paul

> ---
> kernel/rcu/rcuperf.c | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
> index 329010a41f30..e1ce97bead94 100644
> --- a/kernel/rcu/rcuperf.c
> +++ b/kernel/rcu/rcuperf.c
> @@ -279,8 +279,6 @@ static struct rcu_perf_ops sched_ops = {
> .exp_completed = rcu_exp_batches_completed_sched,
> .async = call_rcu_sched,
> .gp_barrier = rcu_barrier_sched,
> - .async = srcu_call_rcu,
> - .gp_barrier = srcu_rcu_barrier,
> .sync = synchronize_sched,
> .exp_sync = synchronize_sched_expedited,
> .name = "sched"
> @@ -310,8 +308,6 @@ static struct rcu_perf_ops tasks_ops = {
> .completed = rcu_no_completed,
> .async = call_rcu_tasks,
> .gp_barrier = rcu_barrier_tasks,
> - .async = call_rcu_tasks,
> - .gp_barrier = rcu_barrier_tasks,
> .sync = synchronize_rcu_tasks,
> .exp_sync = synchronize_rcu_tasks,
> .name = "tasks"
> --
> 2.9.0
>