linux-kernel - Re: PM / wakeirq: Convert to SRCU

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Message-ID: <78880916.SxJZvEGYbI@aspire.rjw.lan>
Date:   Sat, 24 Jun 2017 14:30:10 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Brian Norris <briannorris@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-rockchip@...ts.infradead.org,
        Julia Cartwright <julia@...com>,
        LKML <linux-kernel@...r.kernel.org>, linux-gpio@...r.kernel.org,
        John Keeping <john@...anate.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Doug Anderson <dianders@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: PM / wakeirq: Convert to SRCU

On Saturday, June 24, 2017 02:13:35 PM Thomas Gleixner wrote:
> On Sat, 24 Jun 2017, Rafael J. Wysocki wrote:
> > On Sat, Jun 24, 2017 at 11:56 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > > The wakeirq infrastructure uses RCU to protect the list of wakeirqs. That
> > > breaks the irq bus locking infrastructure, which 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@...omium.org>
> > > Suggested-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > > Cc: stable@...r.kernel.org
> > 
> > OK
> > 
> > I guess it would be good to get this into 4.12?
> 
> I think so, but it probably wants some testing and breeding in next.

Right.

So here's a deal: if there is an -rc8, I can push this to Linus before the
final 4.12, but otherwise it will go into 4.13-rc during the merge window.

The -stable link will still be there, so that shouldn't be a big issue.

Thanks,
Rafael