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

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Date:   Thu, 16 Mar 2017 09:22:05 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Julia Cartwright <julia@...com>
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, 15 Mar 2017, Julia Cartwright wrote:

> 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.

To save a clash of me applying and you submitting v2 I'll not apply
the MFD patches just yet.  But if I have caught you in time, please
apply the following tag to them:

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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