linux-kernel - Re: [PATCH] tools/memory-model/Documentation: Fix SRCU section in explanation.txt

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Message-ID: <130ce800-1bcd-47c0-9058-48e820738852@paulmck-laptop>
Date: Tue, 22 Apr 2025 16:06:28 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: "Uladzislau Rezki (Sony)" <urezki@...il.com>,
	Joel Fernandes <joel@...lfernandes.org>, RCU <rcu@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj upadhyay <Neeraj.Upadhyay@....com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH] tools/memory-model/Documentation: Fix SRCU section in
 explanation.txt

On Tue, Apr 22, 2025 at 06:56:17PM -0400, Joel Fernandes wrote:
> 
> 
> On 4/22/2025 6:55 PM, Joel Fernandes wrote:
> > 
> > 
> > On 4/22/2025 1:56 PM, Paul E. McKenney wrote:
> >> On Tue, Apr 22, 2025 at 07:38:30PM +0200, Uladzislau Rezki (Sony) wrote:
> >>> The SRCU read-side critical sections describes the difference between
> >>> srcu_down_read()/srcu_up_read() and srcu_read_lock()/srcu_read_unlock()
> >>> in a way that a last pair must occur on the same CPU.
> >>>
> >>> This is not true, the srcu_read_unlock() can happen on any CPU, but it
> >>> must be performed by the same task that invoked srcu_read_lock().
> >>>
> >>> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> >>
> >> Good catch!
> >>
> >> Reviewed-by: Paul E. McKenney <paulmck@...nel.org>
> > 
> > Applied, thanks.
> > 
> 
> Oops, though this is memory model and not RCU per-se. Paul do you want to take
> it or should I? ;)

Heh!  I will take this one.  One of those days, I guess!

						Thanx, Pau