Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <1612774577-55943-1-git-send-email-luojiaxing@huawei.com>
 <1612774577-55943-2-git-send-email-luojiaxing@huawei.com> <fab1e871-08e4-fc71-9dbf-9bcacf18e2e1@ti.com>
 <CAK8P3a0m4ocfLyJZ5wMxyKESYUJ5um5sb5MyAzC8ckCb6qAH5g@mail.gmail.com>
 <d5465b81-bb53-49ee-a556-40d208deb765@ti.com> <a61ef337fd1c4538a47fe855920f95d3@hisilicon.com>
 <CAK8P3a3SHQNjF5ZpqHQweG7BQ52Xi1hQKDiMVKq4aNK_7VDw6w@mail.gmail.com>
 <e34a4085-268f-1cd0-a5dc-a87a2e655fe2@ti.com> <2a12cf7a21f74a0c9e2552a467b77fae@hisilicon.com>
In-Reply-To: <2a12cf7a21f74a0c9e2552a467b77fae@hisilicon.com>
From:   Arnd Bergmann <arnd@kernel.org>
Date:   Fri, 12 Feb 2021 11:59:28 +0100
Message-ID: <CAK8P3a0aNfF5D+y--5-reBYO2svykCJFxpZ=1dJoK5JDGHPqKw@mail.gmail.com>
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()
To:     "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>
Cc:     Grygorii Strashko <grygorii.strashko@ti.com>,
        luojiaxing <luojiaxing@huawei.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Santosh Shilimkar <ssantosh@kernel.org>,
        Kevin Hilman <khilman@kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linuxarm@openeuler.org" <linuxarm@openeuler.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Fri, Feb 12, 2021 at 11:42 AM Song Bao Hua (Barry Song)
<song.bao.hua@hisilicon.com> 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.
>
> so looks like this patch can improve by:
> * move other raw_spin_lock_irqsave to raw_spin_lock;
> * keep the raw_spin_lock_irqsave before generic_handle_irq() to mute
> the warning in genirq.

It seems that the other drivers just call handle_nested_irq() instead
of generic_handle_irq().

       Arnd