linux-kernel - Re: [PATCH 14/19] mfd: t7l66xb: make use of raw

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Date:   Wed, 15 Mar 2017 14:07:20 -0500
From:   Julia Cartwright <julia@...com>
To:     Lee Jones <lee.jones@...aro.org>
CC:     <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 14/19] mfd: t7l66xb: make use of raw_spinlock variants

On Wed, Mar 15, 2017 at 11:17:44AM +0000, Lee Jones wrote:
> On Thu, 09 Mar 2017, Julia Cartwright wrote:
> 
> > The t7l66xb mfd driver currently implements an irq_chip for handling
> > interrupts; due to how irq_chip handling is done, it's necessary for the
> > irq_chip methods to be invoked from hardirq context, even on a a
> > real-time kernel.  Because the spinlock_t type becomes a "sleeping"
> > spinlock w/ RT kernels, it is not suitable to be used with irq_chips.
> > 
> > A quick audit of the operations under the lock reveal that they do only
> > minimal, bounded work, and are therefore safe to do under a raw spinlock.
> > 
> > Signed-off-by: Julia Cartwright <julia@...com>
> > ---
> >  drivers/mfd/t7l66xb.c | 20 ++++++++++----------
> >  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> Can the 3 MFD patches in this set be applied on their own, or is there
> a dependency somewhere else in the set?

All of the patches are completely independent, so may be applied on
their own.

> NB: It's normally a good idea to send the set to everyone, or at the
> very least, the 00/00th patch.

Sorry I neglected to CC.  I'll be posting a v2 with the patches that
haven't yet hit next (as of tomorrow, likely), with a revised version of
the coccinelle patch, and will CC you on the coverletter.

Thanks!
   Julia