From: Geert Uytterhoeven <geert@linux-m68k.org>
To: "Paul E . McKenney" <paulmck@kernel.org>
Cc: rcu@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Kernel Team <kernel-team@fb.com>, Ingo Molnar <mingo@kernel.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Triplett <josh@joshtriplett.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
David Howells <dhowells@redhat.com>,
Eric Dumazet <edumazet@google.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Joel Fernandes <joel@joelfernandes.org>
Subject: Re: [PATCH tip/core/rcu 3/4] rcutorture: Make grace-period kthread report match RCU flavor being tested
Date: Tue, 15 Dec 2020 09:40:26 +0100 [thread overview]
Message-ID: <CAMuHMdXjUxfp0h=TiwNoZJUHrSD4sDwYEbuqNR4rcWSRFCjUtw@mail.gmail.com> (raw)
In-Reply-To: <20201105233933.20748-3-paulmck@kernel.org>
Hi Paul,
On Fri, Nov 6, 2020 at 12:40 AM <paulmck@kernel.org> wrote:
>
> From: "Paul E. McKenney" <paulmck@kernel.org>
>
> At the end of the test and after rcu_torture_writer() stalls, rcutorture
> invokes show_rcu_gp_kthreads() in order to dump out information on the
> RCU grace-period kthread. This makes a lot of sense when testing vanilla
> RCU, but not so much for the other flavors. This commit therefore allows
> per-flavor kthread-dump functions to be specified.
>
> [ paulmck: Apply feedback from kernel test robot <lkp@intel.com>. ]
> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Thanks for your patch, which is now commit 27c0f1448389baf7
("rcutorture: Make grace-period kthread report match RCU flavor being
tested").
> --- a/kernel/rcu/rcu.h
> +++ b/kernel/rcu/rcu.h
> @@ -533,4 +533,20 @@ static inline bool rcu_is_nocb_cpu(int cpu) { return false; }
> static inline void rcu_bind_current_to_nocb(void) { }
> #endif
>
> +#if !defined(CONFIG_TINY_RCU) && defined(CONFIG_TASKS_RCU)
> +void show_rcu_tasks_classic_gp_kthread(void);
> +#else
> +static inline void show_rcu_tasks_classic_gp_kthread(void) {}
> +#endif
> +#if !defined(CONFIG_TINY_RCU) && defined(CONFIG_TASKS_RUDE_RCU)
> +void show_rcu_tasks_rude_gp_kthread(void);
> +#else
> +static inline void show_rcu_tasks_rude_gp_kthread(void) {}
> +#endif
The #ifdef expression does not match the one for the implementation
below.
> --- a/kernel/rcu/rcutorture.c
> +++ b/kernel/rcu/rcutorture.c
> @@ -762,6 +765,7 @@ static struct rcu_torture_ops tasks_rude_ops = {
> .exp_sync = synchronize_rcu_tasks_rude,
> .call = call_rcu_tasks_rude,
> .cb_barrier = rcu_barrier_tasks_rude,
> + .gp_kthread_dbg = show_rcu_tasks_rude_gp_kthread,
Perhaps you just want to have a NULL pointer for the dummy case, instead
of instantiating a dummy static inline function and taking its address?
> .fqs = NULL,
> .stats = NULL,
> .irq_capable = 1,
> --- a/kernel/rcu/tasks.h
> +++ b/kernel/rcu/tasks.h
> @@ -696,16 +696,14 @@ static int __init rcu_spawn_tasks_rude_kthread(void)
> }
> core_initcall(rcu_spawn_tasks_rude_kthread);
>
> -#ifndef CONFIG_TINY_RCU
> -static void show_rcu_tasks_rude_gp_kthread(void)
> +#if !defined(CONFIG_TINY_RCU)
Different #ifdef expression.
> +void show_rcu_tasks_rude_gp_kthread(void)
Do you really want to define a non-static function...
> {
> show_rcu_tasks_generic_gp_kthread(&rcu_tasks_rude, "");
> }
> -#endif /* #ifndef CONFIG_TINY_RCU */
> -
> -#else /* #ifdef CONFIG_TASKS_RUDE_RCU */
> -static void show_rcu_tasks_rude_gp_kthread(void) {}
> -#endif /* #else #ifdef CONFIG_TASKS_RUDE_RCU */
> +EXPORT_SYMBOL_GPL(show_rcu_tasks_rude_gp_kthread);
... and export its symbol, from a header file?
I know the file is included only once.
> +#endif // !defined(CONFIG_TINY_RCU)
> +#endif /* #ifdef CONFIG_TASKS_RUDE_RCU */
>
> ////////////////////////////////////////////////////////////////////////
> //
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2020-12-15 8:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-05 23:39 [PATCH tip/core/rcu 0/4] RCU-tasks updates for v5.11 Paul E. McKenney
2020-11-05 23:39 ` [PATCH tip/core/rcu 1/4] rcutorture: Make preemptible TRACE02 enable lockdep paulmck
2020-11-05 23:39 ` [PATCH tip/core/rcu 2/4] rcu-tasks: Convert rcu_tasks_wait_gp() for-loop to while-loop paulmck
2020-11-05 23:39 ` [PATCH tip/core/rcu 3/4] rcutorture: Make grace-period kthread report match RCU flavor being tested paulmck
2020-12-15 8:40 ` Geert Uytterhoeven [this message]
2020-12-15 18:24 ` Paul E. McKenney
2020-12-16 9:31 ` Geert Uytterhoeven
2020-12-16 16:48 ` Paul E. McKenney
2020-12-27 16:49 ` Paul E. McKenney
2020-11-05 23:39 ` [PATCH tip/core/rcu 4/4] rcu-tasks: Make the units of ->init_fract be jiffies paulmck
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