linux-kernel - Re: [PATCH] rcuperf: fix duplicate struct initializer

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Date:   Wed, 19 Apr 2017 12:11:17 -0700
From:   Joe Perches <joe@...ches.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
        Ingo Molnar <mingo@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        SeongJae Park <sj38.park@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcuperf: fix duplicate struct initializer

On Wed, 2017-04-19 at 20:45 +0200, Arnd Bergmann wrote:
> On Wed, Apr 19, 2017 at 8:15 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> > 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@...db.de>
> > 
> > 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. ]
> 
> Thanks!
> 
> Note that one of them was not redundant but actually incorrect, as it
> replaced the _rcu_sched variant with the srcu_ variant.

Perhaps that should be mentioned in the changelog.