linux-kernel - Re: [PATCH] RCU: Fix macro name CONFIG_TASKS_RCU

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Date:   Tue, 13 Jul 2021 09:09:04 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     paulmck <paulmck@...nel.org>
Cc:     zhouzhouyi@...il.com, Josh Triplett <josh@...htriplett.org>,
        rostedt <rostedt@...dmis.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "Joel Fernandes, Google" <joel@...lfernandes.org>,
        rcu <rcu@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RCU: Fix macro name CONFIG_TASKS_RCU_TRACE

----- On Jul 13, 2021, at 12:16 AM, paulmck paulmck@...nel.org wrote:

> On Tue, Jul 13, 2021 at 08:56:45AM +0800, zhouzhouyi@...il.com wrote:
>> From: Zhouyi Zhou <zhouzhouyi@...il.com>
>> 
>> Hi Paul,
>> 
>> During my studying of RCU, I did a grep in the kernel source tree.
>> I found there are 3 places where the macro name CONFIG_TASKS_RCU_TRACE
>> should be CONFIG_TASKS_TRACE_RCU instead.
>> 
>> Without memory fencing, the idle/userspace task inspection may not
>> be so accurate.
>> 
>> Thanks for your constant encouragement for my studying.
>> 
>> Best Wishes
>> Zhouyi
>> 
>> Signed-off-by: Zhouyi Zhou <zhouzhouyi@...il.com>
> 
> Good eyes, and those could cause real bugs, so thank you!

Hi Paul,

This makes me wonder: what is missing testing-wise in rcutorture to
catch those issues with testing before they reach mainline ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com