On Wed, 6 May 2015, Jiang Liu wrote:
> Hi Thomas,
> This is the simplified version, which removed the kernel parameter.
> Seems much simpler:)
But it can be made even simpler. :)
> +enum {
> + /* Allocate CPU vectors from CPUs on device local node */
> + X86_VECTOR_POL_NODE = 0x1,
> + /* Allocate CPU vectors from all online CPUs */
> + X86_VECTOR_POL_GLOBAL = 0x2,
> + /* Allocate CPU vectors from caller specified CPUs */
> + X86_VECTOR_POL_CALLER = 0x4,
> + X86_VECTOR_POL_MIN = X86_VECTOR_POL_NODE,
> + X86_VECTOR_POL_MAX = X86_VECTOR_POL_CALLER,
> +};
> +static int assign_irq_vector_policy(int irq, int node,
> + struct apic_chip_data *data,
> + struct irq_alloc_info *info)
> +{
> + int err = -EBUSY;
> + unsigned int policy;
> + const struct cpumask *mask;
> +
> + if (info && info->mask)
> + policy = X86_VECTOR_POL_CALLER;
> + else
> + policy = X86_VECTOR_POL_MIN;
> +
> + for (; policy <= X86_VECTOR_POL_MAX; policy <<= 1) {
> + switch (policy) {
> + case X86_VECTOR_POL_NODE:
> + if (node >= 0)
> + mask = cpumask_of_node(node);
> + else
> + mask = NULL;
> + break;
> + case X86_VECTOR_POL_GLOBAL:
> + mask = apic->target_cpus();
> + break;
> + case X86_VECTOR_POL_CALLER:
> + if (info && info->mask)
> + mask = info->mask;
> + else
> + mask = NULL;
> + break;
> + default:
> + mask = NULL;
> + break;
> + }
> + if (mask) {
> + err = assign_irq_vector(irq, data, mask);
> + if (!err)
> + return 0;
> + }
> + }
This looks pretty overengineered now that you don't have that parameter check.
if (info && info->mask)
return assign_irq_vector(irq, data, info->mask);
if (node >= 0) {
err = assign_irq_vector(irq, data, cpumask_of_node(node));
if (!err)
return 0;
}
return assign_irq_vector(irq, data, apic->target_cpus());
Should do the same, right?
Thanks,
tglx
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