From c2b1063e8feb2115537addce10f36c0c82d11d9b Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 2 Apr 2021 08:23:25 +0200 Subject: genirq: Add a IRQF_NO_DEBUG flag MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The whole call to note_interrupt() can be avoided or return early when interrupts would be marked accordingly. For IPI handlers which always return HANDLED the whole procedure is pretty pointless to begin with. Add a IRQF_NO_DEBUG flag and mark the interrupt accordingly if supplied when the interrupt is requested. When noirqdebug is set on the kernel commandline, then the interrupt is marked unconditionally so that there is only one condition in the hotpath to evaluate. [ clg: Add changelog ] Signed-off-by: Thomas Gleixner Signed-off-by: Cédric Le Goater Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/7a8ad02f-63a8-c1aa-fdd1-39d973593d02@kaod.org --- kernel/irq/manage.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'kernel/irq/manage.c') diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 4c14356543d9..7bdd09e7d5f0 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1686,8 +1686,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) if (new->flags & IRQF_PERCPU) { irqd_set(&desc->irq_data, IRQD_PER_CPU); irq_settings_set_per_cpu(desc); + if (new->flags & IRQF_NO_DEBUG) + irq_settings_set_no_debug(desc); } + if (noirqdebug) + irq_settings_set_no_debug(desc); + if (new->flags & IRQF_ONESHOT) desc->istate |= IRQS_ONESHOT; -- cgit