linux-kernel - Re: [PATCH] PM / wakeup: use seq

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Message-ID: <20180302090546.GB30267@amd>
Date:   Fri, 2 Mar 2018 10:05:46 +0100
From:   Pavel Machek <pavel@....cz>
To:     Ganesh Mahendran <opensource.ganesh@...il.com>
Cc:     rjw@...ysocki.net, len.brown@...el.com, gregkh@...uxfoundation.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / wakeup: use seq_open() to show wakeup stats

On Fri 2018-03-02 13:01:00, Ganesh Mahendran wrote:
> single_open() interface requires that the whole output must
> fit into a single buffer. This will lead to timeout when
> system memory is not in a good situation.
> 
> This patch use seq_open() to show wakeup stats. This method
> need only one page, so timeout will not be observed.

Can the rcu_read_unlock be delayed arbitrarily by userland code?

Is that ok with RCU?
								Pavel
								
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