linux-kernel - Re: [PATCH 3/8] srcu: Use local_lock() for per-CPU struct srcu

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Message-ID: <20200520185005.GA15928@pc636>
Date:   Wed, 20 May 2020 20:50:05 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        rcu@...r.kernel.org
Subject: Re: [PATCH 3/8] srcu: Use local_lock() for per-CPU struct srcu_data
 access

>
> I actually found it in RT 4.4 kernel, I thought this was also on newer RT
> kernels as well (is that not true anymore?). But yes it was exactly what
> Peter said.
> 
I see it also in 5.6.4 linut-rt-devel:

<snip>
#ifdef CONFIG_PREEMPT_RT
...
# define get_local_ptr(var) ({ \
 migrate_disable(); \
 this_cpu_ptr(var); })
...
<snip>

--
Vlad Rezki