9  * this driver, these are called "shadow interrupts". The assignment of shadow
14  * allocates another IRQ number (say 29) to be its shadow. The device tree
15  * reflects this by adding the pair <30 29> to the "econet,shadow-interrupts"
46  *	- NOT_PERCPU: This interrupt is not per-cpu, so it has no shadow
47  *	- IS_SHADOW: This interrupt is a shadow of another per-cpu interrupt
48  *	- else: This is a per-cpu interrupt whose shadow is the value
74 	u8 shadow;  in econet_chmask()  local
77 	 * If the IRQ is a shadow, it should never be manipulated directly.  in econet_chmask()
80 	 * If it is per-cpu (has a shadow), and we're on VPE#1, the shadow is what we mask.  in econet_chmask()
83 	shadow = econet_intc.interrupt_shadows[hwirq];  in econet_chmask()
84 	if (WARN_ON_ONCE(shadow == IS_SHADOW))  in econet_chmask()
86 	else if (shadow != NOT_PERCPU && smp_processor_id() == 1)  in econet_chmask()
87 		hwirq = shadow;  in econet_chmask()
163 		pr_err("%s: can't map hwirq %lu, it is a shadow interrupt\n", __func__, hwirq);  in econet_intc_map()
194 	const char *field = "econet,shadow-interrupts";  in get_shadow_interrupts()
219 		u32 shadow = shadows[i + 1];  in get_shadow_interrupts()  local
222 		if (shadow > IRQ_COUNT) {  in get_shadow_interrupts()
223 			pr_err("%pOF: %s[%d] shadow(%d) out of range\n",  in get_shadow_interrupts()
224 			       node, field, i + 1, shadow);  in get_shadow_interrupts()
234 			pr_err("%pOF: %s[%d] target(%d) already has a shadow\n",  in get_shadow_interrupts()
239 		if (econet_intc.interrupt_shadows[shadow] != NOT_PERCPU) {  in get_shadow_interrupts()
240 			pr_err("%pOF: %s[%d] shadow(%d) already has a target\n",  in get_shadow_interrupts()
241 			       node, field, i + 1, shadow);  in get_shadow_interrupts()
245 		econet_intc.interrupt_shadows[target] = shadow;  in get_shadow_interrupts()
246 		econet_intc.interrupt_shadows[shadow] = IS_SHADOW;  in get_shadow_interrupts()