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b70e13885c
linux/kernel/irq
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Ingo Molnar b70e13885c genirq: Disable irqfixup/poll on PREEMPT_RT. 
The support for misrouted IRQs is used on old / legacy systems and is
not feasible on PREEMPT_RT.

Polling for interrupts reduces the overall system performance.
Additionally the interrupt latency depends on the polling frequency and
delays are not desired for real time workloads.

Disable IRQ polling on PREEMPT_RT and let the user know that it is not
enabled. The compiler will optimize the real fixup/poll code out.

[ bigeasy: Update changelog and switch to IS_ENABLED() ]

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210917223841.c6j6jcaffojrnot3@linutronix.de
2021-09-19 23:01:15 +02:00
..
affinity.c genirq/affinity: Replace deprecated CPU-hotplug functions. 2021-08-10 14:51:26 +02:00
autoprobe.c genirq: Delay deactivation in free_irq() 2019-07-03 10:12:28 +02:00
chip.c genirq: Provide IRQCHIP_AFFINITY_PRE_STARTUP 2021-08-10 10:59:20 +02:00
cpuhotplug.c genirq/cpuhotplug: Demote debug printk to KERN_DEBUG 2021-08-24 09:16:20 +02:00
debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk 2018-02-01 13:36:15 -08:00
debugfs.c Merge branch 'irq/qcom-pdc-wakeup' into irq/irqchip-next 2020-10-06 11:28:03 +01:00
devres.c genirq/devres: Use struct_size() in devm_kzalloc() 2019-04-16 21:54:03 +02:00
dummychip.c irq: Fix typos in comments 2021-03-22 04:23:14 +01:00
generic-chip.c genirq/generic_chip: Use struct_size() in kzalloc() 2021-08-10 15:35:20 +02:00
handle.c genirq: Add a IRQF_NO_DEBUG flag 2021-05-17 20:01:35 +02:00
internals.h genirq/chip: Use the first chip in irq_chip_compose_msi_msg() 2020-09-16 16:52:28 +02:00
ipi.c genirq: Fix kernel-doc warnings in pm.c, msi.c and ipi.c 2021-08-11 14:33:35 +02:00
irq_sim.c The usual updates from the irq departement: 2021-04-26 09:43:16 -07:00
irqdesc.c genirq: Improve "hwirq" output in /proc and /sys/ 2021-07-30 23:07:31 +02:00
irqdomain.c powerpc updates for 5.15 2021-09-03 11:22:50 -07:00
Kconfig powerpc: Move the use of irq_domain_add_nomap() behind a config option 2021-06-10 13:09:17 +01:00
Makefile genirq/timings: Add selftest for circular array 2019-06-12 10:47:04 +02:00
manage.c genirq: Move prio assignment into the newly created thread 2021-09-17 15:08:22 +02:00
matrix.c genirq/matrix: Fix kernel doc warnings for irq_matrix_alloc_managed() 2021-08-10 22:50:07 +02:00
migration.c genirq: Fix typos and misspellings in comments 2021-03-16 15:08:29 +01:00
msi.c Updates to the interrupt core and driver subsystems: 2021-08-30 14:38:37 -07:00
pm.c genirq: Fix kernel-doc warnings in pm.c, msi.c and ipi.c 2021-08-11 14:33:35 +02:00
proc.c genirq: Improve "hwirq" output in /proc and /sys/ 2021-07-30 23:07:31 +02:00
resend.c genirq: Fix typos and misspellings in comments 2021-03-16 15:08:29 +01:00
settings.h genirq: Add a IRQF_NO_DEBUG flag 2021-05-17 20:01:35 +02:00
spurious.c genirq: Disable irqfixup/poll on PREEMPT_RT. 2021-09-19 23:01:15 +02:00
timings.c Updates to the interrupt core and driver subsystems: 2021-08-30 14:38:37 -07:00