On 10/23/2017 04:59 PM, Christoph Muellner wrote:
> To set a GPIO interrupt's CPU affinity, we simply call
> rtdm_irq_affinity() with a proper bitmask.
>
> Signed-off-by: Christoph Muellner <[email protected]>
> ---
> kernel/drivers/gpio/gpio-core.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/kernel/drivers/gpio/gpio-core.c b/kernel/drivers/gpio/gpio-core.c
> index 55594f6ae..84153a937 100644
> --- a/kernel/drivers/gpio/gpio-core.c
> +++ b/kernel/drivers/gpio/gpio-core.c
> @@ -118,6 +118,23 @@ static void release_gpio_irq(unsigned int gpio, struct
> rtdm_gpio_pin *pin,
> chan->requested = false;
> }
>
> +static int set_gpio_irq_affinity(struct rtdm_gpio_pin *pin, int val)
> +{
> + cpumask_t tgt;
> + unsigned int i = 0;
> +
> + cpumask_clear(&tgt);
> +
> + while (val) {
> + if (val & (1 << i))
> + cpumask_set_cpu(i, &tgt);
> + val &= ~(1 << i);
> + i++;
> + }
> +
> + return rtdm_irq_affinity(&pin->irqh, tgt);
> +}
> +
Reflecting the change from int -> cpu_set_t in the ABI, we could have
something along these lines instead:
static int set_gpio_irq_affinity(struct rtdm_gpio_pin *pin, unsigned
long __user *u_set, size_t setsize)
{
cpumask_var_t mask;
int ret;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
ret = get_user_cpu_mask(u_set, setsize, mask);
if (ret == 0)
ret = do_set_gpio_affinity(pin, mask);
free_cpumask_var(mask);
...
--
Philippe.
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