From 7dfe819803898c824d55a4afe3a0089861681041 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Tue, 27 Jan 2015 21:45:52 +0000 Subject: [PATCH] MIPS: cevt-r4k: Make interrupt handler shared Make the cevt-r4k interrupt handler shared so that other interrupt handlers (specifically the performance counter overflow handler and fast debug channel interrupt handler) can share the same interrupt line. This simply imvolves returning IRQ_NONE when no timer interrupt has been handled to allow other handlers to run, and passing IRQF_SHARED when setting up the IRQ handler so that other handlers (with compatible flags) can be registered. Signed-off-by: James Hogan Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/9128/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/cevt-r4k.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c index 43ae71870797..4ceed0a66856 100644 --- a/arch/mips/kernel/cevt-r4k.c +++ b/arch/mips/kernel/cevt-r4k.c @@ -80,6 +80,8 @@ irqreturn_t c0_compare_interrupt(int irq, void *dev_id) write_c0_compare(read_c0_compare()); cd = &per_cpu(mips_clockevent_device, cpu); cd->event_handler(cd); + } else { + return IRQ_NONE; } out: @@ -88,7 +90,11 @@ out: struct irqaction c0_compare_irqaction = { .handler = c0_compare_interrupt, - .flags = IRQF_PERCPU | IRQF_TIMER, + /* + * IRQF_SHARED: The timer interrupt may be shared with other interrupts + * such as perf counter and FDC interrupts. + */ + .flags = IRQF_PERCPU | IRQF_TIMER | IRQF_SHARED, .name = "timer", }; -- 2.20.1