From 45cb08f4791ce6a15c54598b4cb73db4b4b8294f Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Thu, 16 Mar 2017 09:55:45 +0100 Subject: [PATCH] powerpc: Handle simultaneous interrupts at once It often happens to have simultaneous interrupts, for instance when having double Ethernet attachment. With the current implementation, we suffer the cost of kernel entry/exit for each interrupt. This patch introduces a loop in __do_irq() to handle all interrupts at once before returning. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/irq.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 5c291df30fe3..ab2ed9afd3c2 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -481,7 +481,11 @@ void __do_irq(struct pt_regs *regs) if (unlikely(!irq)) __this_cpu_inc(irq_stat.spurious_irqs); else - generic_handle_irq(irq); + do { + generic_handle_irq(irq); + + irq = ppc_md.get_irq(); + } while (irq); trace_irq_exit(regs); -- 2.11.0