* Copyright (C) 2013 Seiji Aguchi <seiji.aguchi@hds.com>
*
*/
+#include <linux/jump_label.h>
+#include <linux/atomic.h>
+
#include <asm/hw_irq.h>
#include <asm/desc.h>
-#include <linux/atomic.h>
atomic_t trace_idt_ctr = ATOMIC_INIT(0);
struct desc_ptr trace_idt_descr = { NR_VECTORS * 16 - 1,
/* No need to be aligned, but done to keep all IDTs defined the same way. */
gate_desc trace_idt_table[NR_VECTORS] __page_aligned_bss;
+DEFINE_STATIC_KEY_FALSE(trace_irqvectors_key);
static int trace_irq_vector_refcount;
static DEFINE_MUTEX(irq_vector_mutex);
int trace_irq_vector_regfunc(void)
{
+ static_branch_inc(&trace_irqvectors_key);
+
mutex_lock(&irq_vector_mutex);
if (!trace_irq_vector_refcount) {
set_trace_idt_ctr(1);
void trace_irq_vector_unregfunc(void)
{
+ static_branch_dec(&trace_irqvectors_key);
+
mutex_lock(&irq_vector_mutex);
trace_irq_vector_refcount--;
if (!trace_irq_vector_refcount) {