linux-kernel - Re: [PATCH 2/2] x86/mm/kmmio: Remove rcu_read

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Message-ID: <20221209130958.4f1d3057@gandalf.local.home>
Date:   Fri, 9 Dec 2022 13:09:58 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Karol Herbst <karolherbst@...il.com>,
        Pekka Paalanen <ppaalanen@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Subject: Re: [PATCH 2/2] x86/mm/kmmio: Remove rcu_read_lock()

On Fri, 9 Dec 2022 13:03:34 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 7 Dec 2022 09:36:21 -0800
> "Paul E. McKenney" <paulmck@...nel.org> wrote:
> 
> > > Cc: "Paul E. McKenney" <paulmck@...nel.org>
> > > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>    
> > 
> > Might be worth adding a comment saying that others are using this
> > preempt_disable() to block an RCU grace period, but that is up to
> > you guys.  I will let you and your future selves be the judges.  
> 
> Good point. I'll add a comment in v2.

Actually, rcu_read_lock_sched_notrace() may work instead. Let me test it.

-- Steve