irqchip/gicv3-its: Use new jump label API

Use newly introduced jump label API.

Make this a separate patch for easier backporting to older kernels of
the errata patch set.

Signed-off-by: Robert Richter <rrichter@cavium.com>
Reviewed-by: Marc Zygnier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Tirumalesh Chalamarla <tchalamarla@cavium.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1442869119-1814-7-git-send-email-rric@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/irqchip/irq-gic-v3.c

@@ -139,11 +139,11 @@ static u64 gic_read_iar_cavium_thunderx(void)
 	return irqstat;
 }
 
-static struct static_key is_cavium_thunderx = STATIC_KEY_INIT_FALSE;
+static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx);
 
 static u64 __maybe_unused gic_read_iar(void)
 {
-	if (static_key_false(&is_cavium_thunderx))
+	if (static_branch_unlikely(&is_cavium_thunderx))
 		return gic_read_iar_cavium_thunderx();
 	else
 		return gic_read_iar_common();
@@ -871,7 +871,7 @@ static const struct irq_domain_ops gic_irq_domain_ops = {
 static void gicv3_enable_quirks(void)
 {
 	if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154))
-		static_key_slow_inc(&is_cavium_thunderx);
+		static_branch_enable(&is_cavium_thunderx);
 }
 
 static int __init gic_of_init(struct device_node *node, struct device_node *parent)