From f21746a36a8fbeb6ff7364e3df587bda8e086036 Mon Sep 17 00:00:00 2001 From: Con Kolivas Date: Wed, 7 Dec 2016 21:13:16 +1100 Subject: [PATCH 12/16] 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 d79ef2493a28..8aa20871e7d0 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -108,6 +108,23 @@ 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 21ea370fccda..fc1d9117a4d2 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -25,9 +25,20 @@ #include "internals.h" #if defined(CONFIG_IRQ_FORCED_THREADING) && !defined(CONFIG_PREEMPT_RT) +#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; -- 2.25.1