Re: [PATCH 0/2] hwspinlock: add the 'in_atomic' API

[Fabien DESSENNE]

Hi


Gentle reminder


Fabien

On 07/03/2019 4:58 PM, 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.
>
> 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(-)
>