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Date:   Mon, 18 Sep 2017 11:11:05 -0400
From:   Steven Rostedt <>
To:     Neeraj Upadhyay <>
Subject: Re: Query regarding synchronize_sched_expedited and resched_cpu

On Sun, 17 Sep 2017 11:37:06 +0530
Neeraj Upadhyay <> wrote:

> Hi Paul, how about replacing raw_spin_trylock_irqsave with
> raw_spin_lock_irqsave in resched_cpu()? Are there any paths
> in RCU code, which depend on trylock check/spinlock recursion?

It looks to me that resched_cpu() was added for nohz full sched
balancing, but is not longer used by that. The only user is currently
RCU. Perhaps we should change that from a trylock to a lock.

-- Steve

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