powerpc: use IRQF_NO_DEBUG for IPIs

There is no need to use the lockup detector ("noirqdebug") for IPIs.
The ipistorm benchmark measures a ~10% improvement on high systems
when this flag is set.

Signed-off-by: Cédric Le Goater <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

arch/powerpc/sysdev/xics/xics-common.c

@@ -132,7 +132,7 @@ static void xics_request_ipi(void)
 	 * IPIs are marked IRQF_PERCPU. The handler was set in map.
 	 */
 	BUG_ON(request_irq(ipi, icp_ops->ipi_action,
-			   IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL));
+			   IRQF_NO_DEBUG | IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL));
 }
 
 void __init xics_smp_probe(void)

arch/powerpc/sysdev/xive/common.c

@@ -1149,7 +1149,8 @@ static int __init xive_request_ipi(void)
 		snprintf(xid->name, sizeof(xid->name), "IPI-%d", node);
 
 		ret = request_irq(xid->irq, xive_muxed_ipi_action,
-				  IRQF_PERCPU | IRQF_NO_THREAD, xid->name, NULL);
+				  IRQF_NO_DEBUG | IRQF_PERCPU | IRQF_NO_THREAD,
+				  xid->name, NULL);
 
 		WARN(ret < 0, "Failed to request IPI %d: %d\n", xid->irq, ret);
 	}