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    Subject[PATCH 1/3] genirq/affinity: Add irq_update_affinity_desc()
    Date
    From: Thomas Gleixner <tglx@linutronix.de>

    Add a function to allow the affinity of an interrupt be switched to
    managed, such that interrupts allocated for platform devices may be
    managed.

    <Insert author sob>
    [jpg: Add commit message and add prototypes]
    Signed-off-by: John Garry <john.garry@huawei.com>
    ---
    Thomas, I just made you author since you provided the original code, hope
    it's ok.

    include/linux/interrupt.h | 8 ++++++++
    kernel/irq/manage.c | 19 +++++++++++++++++++
    2 files changed, 27 insertions(+)

    diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
    index ee8299eb1f52..870b3251e174 100644
    --- a/include/linux/interrupt.h
    +++ b/include/linux/interrupt.h
    @@ -352,6 +352,8 @@ extern int irq_can_set_affinity(unsigned int irq);
    extern int irq_select_affinity(unsigned int irq);

    extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
    +extern int irq_update_affinity_desc(unsigned int irq,
    + struct irq_affinity_desc *affinity);

    extern int
    irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
    @@ -387,6 +389,12 @@ static inline int irq_set_affinity_hint(unsigned int irq,
    return -EINVAL;
    }

    +static inline int irq_update_affinity_desc(unsigned int irq,
    + struct irq_affinity_desc *affinity)
    +{
    + return -EINVAL;
    +}
    +
    static inline int
    irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
    {
    diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
    index c460e0496006..b96af4cde4bc 100644
    --- a/kernel/irq/manage.c
    +++ b/kernel/irq/manage.c
    @@ -371,6 +371,25 @@ int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
    return ret;
    }

    +int irq_update_affinity_desc(unsigned int irq,
    + struct irq_affinity_desc *affinity)
    +{
    + unsigned long flags;
    + struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
    +
    + if (!desc)
    + return -EINVAL;
    +
    + if (affinity->is_managed) {
    + irqd_set(&desc->irq_data, IRQD_AFFINITY_MANAGED);
    + irqd_set(&desc->irq_data, IRQD_MANAGED_SHUTDOWN);
    + }
    +
    + cpumask_copy(desc->irq_common_data.affinity, &affinity->mask);
    + irq_put_desc_unlock(desc, flags);
    + return 0;
    +}
    +
    int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force)
    {
    struct irq_desc *desc = irq_to_desc(irq);
    --
    2.26.2
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