linux-kernel - Re: [PATCH 14/19] rcu/context-tracking: Move RCU-dynticks internal functions to context

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Date:   Fri, 11 Mar 2022 08:14:24 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Phil Auld <pauld@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yu Liao <liaoyu15@...wei.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Uladzislau Rezki <uladzislau.rezki@...y.com>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH 14/19] rcu/context-tracking: Move RCU-dynticks internal
 functions to context_tracking

On Fri, Mar 11, 2022 at 05:02:39PM +0100, Frederic Weisbecker wrote:
> On Thu, Mar 10, 2022 at 12:07:05PM -0800, Paul E. McKenney wrote:
> > On Wed, Mar 02, 2022 at 04:48:05PM +0100, Frederic Weisbecker wrote:
> > > Move the core RCU eqs/dynticks functions to context tracking so that
> > > we can later merge all that code within context tracking.
> > > 
> > > Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> > 
> > I am not sure that you want rcu_dynticks_task_enter() and friends in
> > context tracking, but I have no objection to them living there.  ;-)
> 
> I initially tried to keep them in RCU headers but their use of "current"
> would imply a circular dependency with sched.h.
> 
> Not much appealing alternatives could be:
> 
> * macrofying them
> * uninline them and keep in RCU
> 
> ...

Sounds like good reasons for them to live outside of kernel/rcu.

							Thanx, Paul