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

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Date:   Fri, 11 Dec 2020 00:39:21 +1100
From:   Daniel Axtens <dja@...ens.net>
To:     Uladzislau Rezki <urezki@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>
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>,
        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()

Hi Vlad,

>> 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>

Tested-by: Daniel Axtens <dja@...ens.net>

>> ---
>>  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.

Sorry it's taken me so long to get to this. Your patch fixes things for
me. Thanks!

BTW, I'm happy to see you taking on the challenge of RCU after your good
work on vmalloc - all the best with it!

Kind regards,
Daniel

>
> Thank you in advance!
>
> --
> Vlad Rezki