open list:GPIO SUBSYSTEM
> ; linux-kernel@vger.kernel.org;
> linux...@openeuler.org
> Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
> raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
>
> On Fri, Feb 12, 2021 at 12:53 PM Grygorii Strashko
On Fri, Feb 12, 2021 at 12:53 PM Grygorii Strashko
wrote:
>
> The worst RT case I can imagine is when gpio API is still called from hard
> IRQ context by some
> other device driver - some toggling for example.
> Note. RT or "threadirqs" does not mean gpiochip become sleepable.
>
> In this case:
Hilman ; open list:GPIO SUBSYSTEM
> ; linux-kernel@vger.kernel.org;
> linux...@openeuler.org
> Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
> raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
>
>
>
> On 12/02/2021 15:12, Song Bao Hu
Shilimkar ;
Kevin Hilman ; open list:GPIO SUBSYSTEM
; linux-kernel@vger.kernel.org;
linux...@openeuler.org
Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
On 12/02/2021 13:29, Song Bao Hua (Barry Song) wrote
Hilman ; open list:GPIO SUBSYSTEM
> ; linux-kernel@vger.kernel.org;
> linux...@openeuler.org
> Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
> raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
>
>
>
> On 12/02/2021 13:29, Song Bao Hu
Shilimkar ; Kevin
Hilman ; open list:GPIO SUBSYSTEM
; linux-kernel@vger.kernel.org;
linux...@openeuler.org
Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
On Fri, Feb 12, 2021 at 10:42:19AM +, Song Bao Hua
On Fri, Feb 12, 2021 at 11:59:28AM +0100, Arnd Bergmann wrote:
> On Fri, Feb 12, 2021 at 11:42 AM Song Bao Hua (Barry Song)
> wrote:
> >
> > Ok, second thought. irqsave before generic_handle_irq() won't defeat
> > the purpose of preemption too much as the dispatched irq handlers by
> > gpiochip
Hilman ; open list:GPIO SUBSYSTEM
> ; linux-kernel@vger.kernel.org;
> linux...@openeuler.org
> Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
> raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
>
> On Fri, Feb 12, 2021 at 10:42:19AM +, S
On Fri, Feb 12, 2021 at 11:42 AM Song Bao Hua (Barry Song)
wrote:
>
> Ok, second thought. irqsave before generic_handle_irq() won't defeat
> the purpose of preemption too much as the dispatched irq handlers by
> gpiochip will run in their own threads but not in the thread of
> gpiochip's handler.
On Fri, Feb 12, 2021 at 10:42:19AM +, Song Bao Hua (Barry Song) wrote:
> > From: Grygorii Strashko [mailto:grygorii.stras...@ti.com]
> > Sent: Friday, February 12, 2021 11:28 PM
> > On 12/02/2021 11:45, Arnd Bergmann wrote:
> > > On Fri, Feb 12, 2021 at 6:05 AM Song Bao Hua (Barry Song)
> > >
ilimkar
> ; Kevin Hilman ; open list:GPIO
> SUBSYSTEM ; linux-kernel@vger.kernel.org;
> linux...@openeuler.org
> Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
> raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
>
> Hi Arnd,
>
> O
Hi Arnd,
On 12/02/2021 11:45, Arnd Bergmann wrote:
On Fri, Feb 12, 2021 at 6:05 AM Song Bao Hua (Barry Song)
wrote:
-Original Message-
Note. there is also generic_handle_irq() call inside.
So generic_handle_irq() is not safe to run in thread thus requires
an interrupt-disabled
;
> Kevin Hilman ; open list:GPIO SUBSYSTEM
> , linux-kernel@vger.kernel.org
> ; linux...@openeuler.org
> Subject: Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
> raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
>
> On Fri, Feb 12, 2021
On Fri, Feb 12, 2021 at 6:05 AM Song Bao Hua (Barry Song)
wrote:
> > -Original Message-
> >
> > Note. there is also generic_handle_irq() call inside.
>
> So generic_handle_irq() is not safe to run in thread thus requires
> an interrupt-disabled environment to run? If so, I'd rather this
en list:GPIO
> SUBSYSTEM , linux-kernel@vger.kernel.org
> ; linux...@openeuler.org
> Subject: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace
> raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
>
>
>
> On 11/02/2021 21:39, Arnd Bergmann wrote:
>
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