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genirq: Provide kstat_irqdesc_cpu() 

Most users of kstat_irqs_cpu() have the irq descriptor already. No point in
calling into the core code and looking it up once more.

Use it in per_cpu_count_show() to start with.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201210194043.362094758@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-12-10 20:25:44 +01:00
parent 26c19d0a86
commit 501e2db67f
2 changed files with 8 additions and 2 deletions
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6
include/linux/irqdesc.h
View File

@ -113,6 +113,12 @@ static inline void irq_unlock_sparse(void) { }
extern struct irq_desc irq_desc[NR_IRQS];
#endif
static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc,
unsigned int cpu)
{
return desc->kstat_irqs ? *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
}
static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
{
return container_of(data->common, struct irq_desc, irq_common_data);

4
kernel/irq/irqdesc.c
View File

@ -147,12 +147,12 @@ static ssize_t per_cpu_count_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
int cpu, irq = desc->irq_data.irq;
ssize_t ret = 0;
char *p = "";
int cpu;
for_each_possible_cpu(cpu) {
unsigned int c = kstat_irqs_cpu(irq, cpu);
unsigned int c = irq_desc_kstat_cpu(desc, cpu);
ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
p = ",";