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From: Sebastian Andrzej Siewior <>
To: "Zhang, Qiang" <>
Cc: "" <>,
	LKML <>,
	Thomas Gleixner <>
Subject: Re: Question on (locking: Make spinlock_t and rwlock_t a RCU section on RT)
Date: Fri, 30 Jul 2021 16:44:27 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 2021-07-26 07:43:33 [+0000], Zhang, Qiang wrote:
> Operation of sleep is not allowed in RCU read critical area,  If
> after acquiring a rt-spinlock , try to acquire another one
> rt-spinlock,  This may cause sleep, and trigger RCU warning.  
> Is there a problem with my analysis or something I missed?

This warning is suppressed on RT. Same as on CONFIG_PREEMPT when a task
gets preempted while in a rcu_read_lock() section.

> Thanks
> Qiang


      reply	other threads:[~2021-07-30 14:44 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26  7:43 Zhang, Qiang
2021-07-30 14:44 ` Sebastian Andrzej Siewior [this message]

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