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Subject[PATCH v2] powerpc: handle simultaneous interrupts at once
Date
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 <christophe.leroy@c-s.fr>
---
Changed from v1(RFC): simplified following remark from benh

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 a018f5cae899..ba0cb6c2ee7d 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -522,7 +522,11 @@ 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);

--
2.12.0
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