From: Ingo Molnar Date: Fri, 3 Jul 2009 08:29:57 -0500 Subject: genirq: disable irqpoll on -rt Creates long latencies for no value Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- kernel/irq/spurious.c | 10 ++++++++++ 1 file changed, 10 insertions(+) Index: linux-stable/kernel/irq/spurious.c =================================================================== --- linux-stable.orig/kernel/irq/spurious.c +++ linux-stable/kernel/irq/spurious.c @@ -341,6 +341,11 @@ MODULE_PARM_DESC(noirqdebug, "Disable ir static int __init irqfixup_setup(char *str) { +#ifdef CONFIG_PREEMPT_RT_BASE + printk(KERN_WARNING "irqfixup boot option not supported " + "w/ CONFIG_PREEMPT_RT_BASE\n"); + return 1; +#endif irqfixup = 1; printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n"); printk(KERN_WARNING "This may impact system performance.\n"); @@ -353,6 +358,11 @@ module_param(irqfixup, int, 0644); static int __init irqpoll_setup(char *str) { +#ifdef CONFIG_PREEMPT_RT_BASE + printk(KERN_WARNING "irqpoll boot option not supported " + "w/ CONFIG_PREEMPT_RT_BASE\n"); + return 1; +#endif irqfixup = 2; printk(KERN_WARNING "Misrouted IRQ fixup and polling support " "enabled\n");