// ARM10C 20141122
// irq: 16, flags: &flags, false, check: 0
// ARM10C 20141122
// irq: 16, flags: &flags, true, check: 0
struct irq_desc *
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
unsigned int check)
{
// irq: 16, irq_to_desc(16): kmem_cache#28-oX (irq 16)
// irq: 16, irq_to_desc(16): kmem_cache#28-oX (irq 16)
struct irq_desc *desc = irq_to_desc(irq);
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
if (desc) {
// check: 0, _IRQ_DESC_CHECK: 1
// check: 0, _IRQ_DESC_CHECK: 1
if (check & _IRQ_DESC_CHECK) {
if ((check & _IRQ_DESC_PERCPU) &&
!irq_settings_is_per_cpu_devid(desc))
return NULL;
if (!(check & _IRQ_DESC_PERCPU) &&
irq_settings_is_per_cpu_devid(desc))
return NULL;
}
// bus: false
// bus: true
if (bus)
// desc: kmem_cache#28-oX (irq 16)
chip_bus_lock(desc);
// &desc->lock: &(kmem_cache#28-oX (irq 16))->lock, *flags: flags
// &desc->lock: &(kmem_cache#28-oX (irq 16))->lock, *flags: flags
raw_spin_lock_irqsave(&desc->lock, *flags);
// &(kmem_cache#28-oX (irq 16))->lock을 사용하여 spinlock을 설정하고 cpsr을 flags에 저장
// &(kmem_cache#28-oX (irq 16))->lock을 사용하여 spinlock을 설정하고 cpsr을 flags에 저장
}
// desc: kmem_cache#28-oX (irq 16)
// desc: kmem_cache#28-oX (irq 16)
return desc;
// return kmem_cache#28-oX (irq 16)
// return kmem_cache#28-oX (irq 16)
}
struct irq_desc *
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
unsigned int check)
{
struct irq_desc *desc = irq_to_desc(irq);
if (desc) {
if (check & _IRQ_DESC_CHECK) {
if ((check & _IRQ_DESC_PERCPU) &&
!irq_settings_is_per_cpu_devid(desc))
return NULL;
if (!(check & _IRQ_DESC_PERCPU) &&
irq_settings_is_per_cpu_devid(desc))
return NULL;
}
if (bus)
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, *flags);
}
return desc;
}
/**
* kstat_irqs - Get the statistics for an interrupt
* @irq: The interrupt number
*
* Returns the sum of interrupt counts on all cpus since boot for
* @irq. The caller must ensure that the interrupt is not removed
* concurrently.
*/
unsigned int kstat_irqs(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned int sum = 0;
int cpu;
if (!desc || !desc->kstat_irqs)
return 0;
if (!irq_settings_is_per_cpu_devid(desc) &&
!irq_settings_is_per_cpu(desc))
return desc->tot_count;
for_each_possible_cpu(cpu)
sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
return sum;
}
