Commit 45cb08f4 authored Mar 16, 2017 by Christophe Leroy Committed by Michael Ellerman Jun 02, 2017

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 <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

parent 3c29b603

arch/powerpc/kernel/irq.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -481,8 +481,12 @@ void __do_irq(struct pt_regs *regs)
		if (unlikely(!irq))
		__this_cpu_inc(irq_stat.spurious_irqs);
		else
		do {
		generic_handle_irq(irq);

		irq = ppc_md.get_irq();
		} while (irq);

		trace_irq_exit(regs);

		irq_exit();