linux-kernel - Re: [PATCH 0/3] rcu/nocb: Fixes and simplification

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Message-ID: <20220419141847.GH4285@paulmck-ThinkPad-P17-Gen-1>
Date:   Tue, 19 Apr 2022 07:18:47 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Zqiang <qiang1.zhang@...el.com>,
        Uladzislau Rezki <uladzislau.rezki@...y.com>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH 0/3] rcu/nocb: Fixes and simplification

On Tue, Apr 19, 2022 at 02:23:17PM +0200, Frederic Weisbecker wrote:
> Hi,
> 
> Some updates for the nocb side:
> 
> * 1st patch is a simplification on adding/deleting an rdp to a nocb group
> 
> * 2nd and 3rd are fixes for the kthread's creation failure path
> 
> Frederic Weisbecker (1):
>   rcu/nocb: Add/del rdp to iterate from rcuog itself

A very welcome simplification!

> Zqiang (2):
>   rcu: Invert rcu_state.barrier_mutex VS hotplug lock locking order
>   rcu/nocb: Fix NOCB kthreads spawn failure with
>     rcu_nocb_rdp_deoffload() direct call

And here is to added robustness!

I queued these for review and testing, thank you!  By default, these
would go into the v5.20 (or will it be v6.0?) pile.  Please let me know
if they are more urgent and need to go into v5.19 instead.

							Thanx, Paul

>  kernel/rcu/tree.h      |   1 +
>  kernel/rcu/tree_nocb.h | 226 +++++++++++++++++++++++++----------------
>  2 files changed, 139 insertions(+), 88 deletions(-)
> 
> -- 
> 2.25.1
>