From: Tony Lindgren <tony@atomide.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Brian Norris <briannorris@chromium.org>,
Heiko Stuebner <heiko@sntech.de>,
Linus Walleij <linus.walleij@linaro.org>,
linux-rockchip@lists.infradead.org,
Julia Cartwright <julia@ni.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-gpio@vger.kernel.org, John Keeping <john@metanate.com>,
linux-pm@vger.kernel.org, Doug Anderson <dianders@chromium.org>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [PATCH v2] PM / wakeirq: Convert to SRCU
Date: Mon, 26 Jun 2017 03:15:57 -0700 [thread overview]
Message-ID: <20170626101557.GV3730@atomide.com> (raw)
In-Reply-To: <20170625182926.GB3721@linux.vnet.ibm.com>
* Paul E. McKenney <paulmck@linux.vnet.ibm.com> [170625 11:29]:
> On Sun, Jun 25, 2017 at 07:31:13PM +0200, Thomas Gleixner wrote:
> > The wakeirq infrastructure uses RCU to protect the list of wakeirqs. That
> > breaks the irq bus locking infrastructure, which is allows sleeping
> > functions to be called so interrupt controllers behind slow busses,
> > e.g. i2c, can be handled.
> >
> > The wakeirq functions hold rcu_read_lock and call into irq functions, which
> > in case of interrupts using the irq bus locking will trigger a
> > might_sleep() splat.
> >
> > Convert the wakeirq infrastructure to Sleepable RCU and unbreak it.
> >
> > Fixes: 4990d4fe327b ("PM / Wakeirq: Add automated device wake IRQ handling")
> > Reported-by: Brian Norris <briannorris@chromium.org>
> > Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
> Looks good to me!
>
> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
And still works for me!
Tested-by: Tony Lindgren <tony@atomide.com>
next prev parent reply other threads:[~2017-06-26 10:16 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-24 9:56 PM / wakeirq: Convert to SRCU Thomas Gleixner
2017-06-24 12:02 ` Rafael J. Wysocki
2017-06-24 12:13 ` Thomas Gleixner
2017-06-24 12:30 ` Rafael J. Wysocki
2017-06-24 13:53 ` Paul E. McKenney
2017-06-25 9:11 ` Thomas Gleixner
2017-06-25 14:45 ` Paul E. McKenney
2017-06-25 17:31 ` [PATCH v2] " Thomas Gleixner
2017-06-25 18:29 ` Paul E. McKenney
2017-06-26 10:15 ` Tony Lindgren [this message]
2017-06-26 20:37 ` Brian Norris
2017-06-28 20:54 ` Rafael J. Wysocki
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