linux-kernel - Re: [PATCH 0/2] hwspinlock: add the 'in

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Date:   Sat, 29 Jun 2019 21:08:28 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Fabien Dessenne <fabien.dessenne@...com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>, Jonathan Corbet <corbet@....net>,
        linux-remoteproc@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: Re: [PATCH 0/2] hwspinlock: add the 'in_atomic' API

On Thu 07 Mar 07:58 PST 2019, Fabien Dessenne wrote:

> In its current implementation, the hwspinlock framework relies on jiffies
> to handle the timeout of the hwspin_lock_timeout_xxx() API.
> In an atomic context (or more precisely when irq are disabled) jiffies does not
> increase, which prevents the timeout to reach its target value (infinite loop).
> 
> Note that there is already an hwspinlock user that runs in atomic context
> (drivers/irqchip/irq-stm32-exti.c) and that has to handle by itself the
> timeout.
> 
> The first patch of the series completes the Documentation (the 'raw' API
> is not documented), and the second patch provides with the 'in_atomic' API.
> 

Applied

Thanks,
Bjorn

> Fabien Dessenne (2):
>   hwspinlock: document the hwspinlock 'raw' API
>   hwspinlock: add the 'in_atomic' API
> 
>  Documentation/hwspinlock.txt         | 81 ++++++++++++++++++++++++++++++++++++
>  drivers/hwspinlock/hwspinlock_core.c | 43 +++++++++++++------
>  include/linux/hwspinlock.h           | 61 +++++++++++++++++++++++++--
>  3 files changed, 169 insertions(+), 16 deletions(-)
> 
> -- 
> 2.7.4
>