From: Frederic Weisbecker <frederic@kernel.org>
To: Ankur Arora <ankur.a.arora@oracle.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
tglx@linutronix.de, paulmck@kernel.org, mingo@kernel.org,
bigeasy@linutronix.de, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
vschneid@redhat.com, efault@gmx.de, sshegde@linux.ibm.com,
boris.ostrovsky@oracle.com
Subject: Re: [PATCH v3 4/7] rcu: handle unstable rdp in rcu_read_unlock_strict()
Date: Fri, 13 Dec 2024 14:38:52 +0100 [thread overview]
Message-ID: <Z1w47BFWBVIHWFeD@localhost.localdomain> (raw)
In-Reply-To: <20241213040658.2282640-5-ankur.a.arora@oracle.com>
Le Thu, Dec 12, 2024 at 08:06:55PM -0800, Ankur Arora a écrit :
> rcu_read_unlock_strict() can be called with preemption enabled
> which can make for an unstable rdp and a racy norm value.
>
> Fix this by dropping the preempt-count in __rcu_read_unlock()
> after the call to rcu_read_unlock_strict(), adjusting the
> preempt-count check appropriately.
>
> Suggested-by: Frederic Weisbecker <frederic@kernel.org>
> Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
next prev parent reply other threads:[~2024-12-13 13:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-13 4:06 [PATCH v3 0/7] RCU changes for PREEMPT_LAZY Ankur Arora
2024-12-13 4:06 ` [PATCH v3 1/7] rcu: fix header guard for rcu_all_qs() Ankur Arora
2024-12-13 4:06 ` [PATCH v3 2/7] rcu: rename PREEMPT_AUTO to PREEMPT_LAZY Ankur Arora
2024-12-13 4:06 ` [PATCH v3 3/7] sched: update __cond_resched comment about RCU quiescent states Ankur Arora
2024-12-13 13:21 ` Frederic Weisbecker
2024-12-13 4:06 ` [PATCH v3 4/7] rcu: handle unstable rdp in rcu_read_unlock_strict() Ankur Arora
2024-12-13 13:38 ` Frederic Weisbecker [this message]
2024-12-13 4:06 ` [PATCH v3 5/7] rcu: handle quiescent states for PREEMPT_RCU=n, PREEMPT_COUNT=y Ankur Arora
2024-12-13 13:59 ` Frederic Weisbecker
2024-12-13 20:44 ` Ankur Arora
2024-12-13 4:06 ` [PATCH v3 6/7] osnoise: provide quiescent states Ankur Arora
2024-12-13 14:34 ` Frederic Weisbecker
2024-12-13 4:06 ` [PATCH v3 7/7] rcu: limit PREEMPT_RCU configurations Ankur Arora
2025-01-08 1:14 ` [PATCH v3 0/7] RCU changes for PREEMPT_LAZY Paul E. McKenney
2025-01-08 18:18 ` Ankur Arora
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