handle_percpu_devid_fasteoi_ipi() states: * The biggest difference with the IRQ version is that the interrupt is * EOIed early, as the IPI could result in a context switch, and we need to * make sure the IPI can fire again
All that can actually happen scheduler-wise within the handling of an IPI is the raising of TIF_NEED_RESCHED (and / or folding thereof into preempt_count); see scheduler_ipi() or sched_ttwu_pending() for instance. Said flag / preempt_count is evaluated some time later before returning to whatever context was interrupted, and this gates a call to preempt_schedule_irq() (arm64_preempt_schedule_irq() in arm64). Per the above, SGI's do not need a different handler than PPI's, so make them use the same (handle_percpu_devid_irq). Signed-off-by: Valentin Schneider <[email protected]> --- drivers/irqchip/irq-gic-v3.c | 6 ------ drivers/irqchip/irq-gic.c | 8 +------- 2 files changed, 1 insertion(+), 13 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 16fecc0febe8..3fc65375cbe0 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -1302,12 +1302,6 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, switch (__get_intid_range(hw)) { case SGI_RANGE: - irq_set_percpu_devid(irq); - irq_domain_set_info(d, irq, hw, chip, d->host_data, - handle_percpu_devid_fasteoi_ipi, - NULL, NULL); - break; - case PPI_RANGE: case EPPI_RANGE: irq_set_percpu_devid(irq); diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index 6053245a4754..9edbe5b5c4ac 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -1005,13 +1005,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq)); switch (hw) { - case 0 ... 15: - irq_set_percpu_devid(irq); - irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data, - handle_percpu_devid_fasteoi_ipi, - NULL, NULL); - break; - case 16 ... 31: + case 0 ... 31: irq_set_percpu_devid(irq); irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data, handle_percpu_devid_irq, NULL, NULL); -- 2.27.0
