linux-kernel - Re: [PATCH 1/2] rcu-tasks: move RCU-tasks initialization out of core

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Message-ID: <20201209203728.GA5972@pc638.lan>
Date:   Wed, 9 Dec 2020 21:37:28 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Daniel Axtens <dja@...ens.net>
Cc:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH 1/2] rcu-tasks: move RCU-tasks initialization out of
 core_initcall()

> Initialize the RCU-tasks earlier, before *_initcall() callbacks are
> invoked. Do it after the workqueue subsytem is up and running. That
> gives us a possibility to make use of synchronize_rcu_tasks*() wait
> API in early_initcall() callbacks.
> 
> Fixes: 36dadef23fcc ("kprobes: Init kprobes in early_initcall")
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  include/linux/rcupdate.h |  6 ++++++
>  init/main.c              |  1 +
>  kernel/rcu/tasks.h       | 26 ++++++++++++++++++++++----
>  3 files changed, 29 insertions(+), 4 deletions(-)
> 
I still don't have a powerPC hw so far, even though i have sent a request
to the osuosl.org. It would be appreciated if Michael or Daniel could run
and verify it.

Thank you in advance!

--
Vlad Rezki