linux-kernel - Re: [PATCH 1/2] pinctrl: single: Use a separate lockdep class

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Message-ID: <20151203214646.GD23396@atomide.com>
Date:	Thu, 3 Dec 2015 13:46:46 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinctrl: single: Use a separate lockdep class

* Tony Lindgren <tony@...mide.com> [151203 10:07]:
> * Sudeep Holla <sudeep.holla@....com> [151201 06:10]:
> > 
> > 
> > On 01/12/15 14:06, Linus Walleij wrote:
> > >On Fri, Nov 27, 2015 at 6:20 PM, Sudeep Holla <sudeep.holla@....com> wrote:
> > >
> > >>The single pinmux controller can be cascaded to the other interrupt
> > >>controllers. Hence when propagating wake-up settings to its parent
> > >>interrupt controller, there's possiblity of detecting possible recursive
> > >>locking and getting lockdep warning.
> > >>
> > >>This patch avoids this false positive by using a separate lockdep class
> > >>for this single pinctrl interrupts.
> > >>
> > >>Cc: Linus Walleij <linus.walleij@...aro.org>
> > >>Cc: linux-gpio@...r.kernel.org
> > >>Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> > >>Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> > >
> > >I need Tony's ACK on this patch before applying.
> > >
> > >Is it a regression that needs to go into fixes?
> > >
> > 
> > Not really, only needed by PATCH 2/2 to avoid recursive locking.
> 
> No problem with this patch, so:
> 
> Acked-by: Tony Lindgren <tony@...mide.com>

Actually this needs to be merged together with 1/2 once the pending
issues are fixed as this will add a lockdep warning with 1/2.

So for now:

Un-Acked-by: Tony Lindgren <tony@...mide.com>
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