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From 50ddde6e3c62abd39dc6a3cd5941febed7ad49c3 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Wed, 7 Dec 2016 21:13:16 +1100
Subject: [PATCH 13/16] Make threaded IRQs optionally the default which can be
disabled.
---
kernel/irq/Kconfig | 17 +++++++++++++++++
kernel/irq/manage.c | 11 +++++++++++
2 files changed, 28 insertions(+)
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index 5f3e2baefca9..de3e5740679b 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -107,6 +107,23 @@ config GENERIC_IRQ_RESERVATION_MODE
config IRQ_FORCED_THREADING
bool
+config FORCE_IRQ_THREADING
+ bool "Make IRQ threading compulsory"
+ depends on IRQ_FORCED_THREADING
+ default n
+ ---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.
+
+ Enabling this may make some architectures not boot with runqueue
+ sharing and MuQSS.
+
+ 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---
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 1401afa0d58a..54394031b536 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -23,9 +23,20 @@
#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
EXPORT_SYMBOL_GPL(force_irqthreads);
+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)
{
force_irqthreads = true;
--
2.17.1
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