From 0207ad7e8f0e23bd8e2b4e8fb64b0e83a31d9854 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Wed, 7 Dec 2016 21:13:16 +1100
Subject: [PATCH 12/18] Make threaded IRQs optionally the default which can be
 disabled.

---
 kernel/irq/Kconfig  |   14 ++++++++++++++
 kernel/irq/manage.c |   10 ++++++++++
 2 files changed, 24 insertions(+)

Index: linux-4.11-ck1/kernel/irq/Kconfig
===================================================================
--- linux-4.11-ck1.orig/kernel/irq/Kconfig	2017-05-12 13:25:56.005572928 +1000
+++ linux-4.11-ck1/kernel/irq/Kconfig	2017-05-12 13:25:56.005572928 +1000
@@ -95,6 +95,20 @@ config IRQ_DOMAIN_DEBUG
 config IRQ_FORCED_THREADING
        bool
 
+config FORCE_IRQ_THREADING
+	bool "Make IRQ threading compulsory"
+	depends on IRQ_FORCED_THREADING
+	default y
+	---help---
+
+	  Make IRQ threading mandatory for any IRQ handlers that support it
+	  instead of being optional and requiring the threadirqs kernel
+	  parameter. Instead they can be optionally disabled with the
+	  nothreadirqs kernel parameter.
+
+	  Enable if you are building for a desktop or low latency system,
+	  otherwise say N.
+
 config SPARSE_IRQ
 	bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
 	---help---
Index: linux-4.11-ck1/kernel/irq/manage.c
===================================================================
--- linux-4.11-ck1.orig/kernel/irq/manage.c	2017-05-12 13:25:56.005572928 +1000
+++ linux-4.11-ck1/kernel/irq/manage.c	2017-05-12 13:25:56.005572928 +1000
@@ -24,7 +24,17 @@
 #include "internals.h"
 
 #ifdef CONFIG_IRQ_FORCED_THREADING
+#ifdef CONFIG_FORCE_IRQ_THREADING
+__read_mostly bool force_irqthreads = true;
+#else
 __read_mostly bool force_irqthreads;
+#endif
+static int __init setup_noforced_irqthreads(char *arg)
+{
+	force_irqthreads = false;
+	return 0;
+}
+early_param("nothreadirqs", setup_noforced_irqthreads);
 
 static int __init setup_forced_irqthreads(char *arg)
 {