From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: josh@joshtriplett.org, rostedt@goodmis.org,
mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com,
joel@joelfernandes.org, tglx@linutronix.de, swood@redhat.com,
williams@redhat.com, juri.lelli@redhat.com,
linux-rt-users@vger.kernel.org, rcu@vger.kernel.org,
linux-kernel@vger.kernel.org, mingo@kernel.org
Subject: Re: RCU use of swait
Date: Thu, 5 Mar 2020 09:11:35 +0100 [thread overview]
Message-ID: <20200305081135.yg7wryd3hrqzocrm@linutronix.de> (raw)
In-Reply-To: <20200305003526.GA20601@paulmck-ThinkPad-P72>
On 2020-03-04 16:35:26 [-0800], Paul E. McKenney wrote:
> Hello!
Hi Paul,
> Or is there some other reason why {S,}RCU needs to use swait that I
> am forgetting?
swait can be used in hardirq-context (on RT) that is in a section within
local_irq_save() / raw_spin_lock() and so.
wait on the hand uses spinlock_t which can not be used in this context.
So if you have no users which fall into that category then you could
move back to wait.h.
> Thanx, Paul
Sebastian
next prev parent reply other threads:[~2020-03-05 8:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-05 0:35 RCU use of swait Paul E. McKenney
2020-03-05 8:11 ` Sebastian Andrzej Siewior [this message]
2020-03-19 0:47 ` Joel Fernandes
2020-03-19 9:25 ` Sebastian Andrzej Siewior
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