From 50ddde6e3c62abd39dc6a3cd5941febed7ad49c3 Mon Sep 17 00:00:00 2001 From: Con Kolivas 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