linux-kernel - Re: [PATCH 00/10] rcu: Make rcu_core() safe in PREEMPT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20211019001651.GA880162@paulmck-ThinkPad-P17-Gen-1>
Date:   Mon, 18 Oct 2021 17:16:51 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Valentin Schneider <Valentin.Schneider@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Josh Triplett <josh@...htriplett.org>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH 00/10] rcu: Make rcu_core() safe in PREEMPT_RT with NOCB
 + a few other fixes v3

On Tue, Oct 19, 2021 at 02:08:06AM +0200, Frederic Weisbecker wrote:
> Changes since v2:
> 
> _ Drop first patch (got applied by Paul)
> 
> _ Fix unwanted rcu_core() hanging around after setting a CPU as nocb
>   on boot. This resulted in terrible rcu_barrier() misordering.
>   I simply forgot to clear SEGCBLIST_RCU_CORE on nocb CPUs on boot.
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> 	rcu/rt-v3
> 
> HEAD: 7610a2ba5eaca8caf977ed45bad251ac693feefa

Queued for further review and testing!

							Thanx, Paul

> Thanks,
> 	Frederic
> ---
> 
> Frederic Weisbecker (9):
>       rcu/nocb: Prepare state machine for a new step
>       rcu/nocb: Invoke rcu_core() at the start of deoffloading
>       rcu/nocb: Make rcu_core() callbacks acceleration (de-)offloading safe
>       rcu/nocb: Check a stable offloaded state to manipulate qlen_last_fqs_check
>       rcu/nocb: Use appropriate rcu_nocb_lock_irqsave()
>       rcu/nocb: Limit number of softirq callbacks only on softirq
>       rcu: Fix callbacks processing time limit retaining cond_resched()
>       rcu: Apply callbacks processing time limit only on softirq
>       rcu/nocb: Don't invoke local rcu core on callback overload from nocb kthread
> 
> Thomas Gleixner (1):
>       rcu/nocb: Make rcu_core() callbacks acceleration preempt-safe
> 
> 
>  include/linux/rcu_segcblist.h | 51 ++++++++++++++++++-------
>  kernel/rcu/rcu_segcblist.c    | 10 ++---
>  kernel/rcu/rcu_segcblist.h    | 12 +++---
>  kernel/rcu/tree.c             | 87 +++++++++++++++++++++++++++++--------------
>  kernel/rcu/tree_nocb.h        | 33 ++++++++++++----
>  5 files changed, 133 insertions(+), 60 deletions(-)