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From:   Kalesh Singh <kaleshsingh@google.com>
Date:   Fri, 8 Apr 2022 15:06:56 -0700
Message-ID: <CAC_TJvcO6WQMkfrZ5uBGj1vHG0BkRdnZYS5A_oTpWiHo3uhY7A@mail.gmail.com>
Subject: Re: [PATCH v2] EXP rcu: Move expedited grace period (GP) work to RT kthread_worker
To:     Steven Rostedt <rostedt@goodmis.org>
Cc:     paulmck@kernel.org, Joel Fernandes <joel@joelfernandes.org>,
        Suren Baghdasaryan <surenb@google.com>,
        kernel-team <kernel-team@android.com>, Tejun Heo <tj@kernel.org>,
        Tim Murray <timmurray@google.com>, Wei Wang <wvw@google.com>,
        Kyle Lin <kylelin@google.com>,
        Chunwei Lu <chunweilu@google.com>,
        Lulu Wang <luluw@google.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Neeraj Upadhyay <quic_neeraju@quicinc.com>,
        Josh Triplett <josh@joshtriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        rcu <rcu@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
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On Fri, Apr 8, 2022 at 2:42 PM Steven Rostedt <rostedt@goodmis.org> wrote:
>
> On Fri, 8 Apr 2022 10:53:53 -0700
> Kalesh Singh <kaleshsingh@google.com> wrote:
>
> > If PREEMT_RT systems don=E2=80=99t disable expedited grace periods, we =
can
> > remove default off for those. Steve?
>
> Yep, commit 36221e109eb20 ("rcu: Enable rcu_normal_after_boot
> unconditionally for RT") is still there.
>
> OK, that explains it. I missed that change, so I didn't see the relation =
to
> PREEMPT_RT. It wasn't described in the change log nor was there any
> comment in the kconfig to say why it was special. Perhaps that should be
> added for those that don't know all this tribal knowledge ;-)

Thanks for verifying Steve. I'll update the commit and Kconfig texts
accordingly.

-Kalesh

>
> -- Steve
>
> --
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