Re: [Xen-devel] [RFC PATCH 1/6] netback: page pool version 1

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> +static idx_t free_head;
> +static int free_count;
> +static unsigned long pool_size;
> +static DEFINE_SPINLOCK(pool_lock);
> +static struct page_pool_entry *pool;
> +
> +static int get_free_entry(void)
> +{
> +     unsigned long flag;
> +     int idx;
> +
> +     spin_lock_irqsave(&pool_lock, flag);

What is the benfit of using the irq version of the spinlock instead
of the normal one??


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