linux-kernel - Re: [PATCH AUTOSEL 5.10] rcu: Mark rcu_cpu_kthread() accesses to ->rcu_cpu_has

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Message-ID: <ZK58bFy80qmsRI/c@duo.ucw.cz>
Date:   Wed, 12 Jul 2023 12:11:56 +0200
From:   Pavel Machek <pavel@....cz>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>, frederic@...nel.org,
        quic_neeraju@...cinc.com, joel@...lfernandes.org,
        josh@...htriplett.org, boqun.feng@...il.com, rcu@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.10] rcu: Mark rcu_cpu_kthread() accesses to
 ->rcu_cpu_has_work

On Sun 2023-07-02 15:58:06, Sasha Levin wrote:
> From: "Paul E. McKenney" <paulmck@...nel.org>
> 
> [ Upstream commit a24c1aab652ebacf9ea62470a166514174c96fe1 ]
> 
> The rcu_data structure's ->rcu_cpu_has_work field can be modified by
> any CPU attempting to wake up the rcuc kthread.  Therefore, this commit
> marks accesses to this field from the rcu_cpu_kthread() function.
> 
> This data race was reported by KCSAN.  Not appropriate for backporting
> due to failure being unlikely.

Please drop.

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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