linux-kernel - Re: [PATCH 15/19] rcu/context-tracking: Remove unused and/or unecessary middle functions

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Date:   Wed, 09 Mar 2022 17:40:15 +0100
From:   nicolas saenz julienne <nsaenz@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Phil Auld <pauld@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        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>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        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 15/19] rcu/context-tracking: Remove unused and/or
 unecessary middle functions

On Wed, 2022-03-02 at 16:48 +0100, Frederic Weisbecker wrote:
> Some eqs functions are now only used internally by context tracking, so
> their public declarations can be removed.
> 
> Also middle functions such as rcu_user_*() and rcu_idle_*()
> which now directly call to rcu_eqs_enter() and rcu_eqs_exit() can be
> wiped out as well.
> 
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> Cc: Paul E. McKenney <paulmck@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Neeraj Upadhyay <quic_neeraju@...cinc.com>
> Cc: Uladzislau Rezki <uladzislau.rezki@...y.com>
> Cc: Joel Fernandes <joel@...lfernandes.org>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: Nicolas Saenz Julienne <nsaenz@...nel.org>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Cc: Xiongfeng Wang <wangxiongfeng2@...wei.com>
> Cc: Yu Liao<liaoyu15@...wei.com>
> Cc: Phil Auld <pauld@...hat.com>
> Cc: Paul Gortmaker<paul.gortmaker@...driver.com>
> Cc: Alex Belits <abelits@...vell.com>
> ---

You missed rcu_user_{enter,exit} declarations in rcupdate.h

There are also comments refering to them in kernel/context_tracking.c and
Documentation/RCU/stallwarn.rst.

Regards,
Nicolas