commit 1b0ccb8a4eee2d8c14adc996e07335cb7aa9e2ac
author Vineet Gupta <vgupta@synopsys.com> Fri Jan 01 15:12:54 2016 +0530
committer Vineet Gupta <vgupta@synopsys.com> Mon May 09 09:32:30 2016 +0530
tree b78ae35cc351dd3faffcaf8a6fd200b1dd2a0ec3
parent 88555cc584d93e658722f090d3f8fb84d5fa15a5

ARC: [intc-*] Do a domain lookup in primary handler for hwirq -> linux virq

The primary interrupt handler arch_do_IRQ() was passing hwirq as linux
virq to core code. This was fragile and worked so far as we only had legacy/linear
domains.

This came out of a rant by Marc Zyngier.
http://lists.infradead.org/pipermail/linux-snps-arc/2015-December/000298.html

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/kernel/irq.c

diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index fb6dede..538b36a 100644
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -41,12 +41,7 @@
  * "C" Entry point for any ARC ISR, called from low level vector handler
  * @irq is the vector number read from ICAUSE reg of on-chip intc
  */
-void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
+void arch_do_IRQ(unsigned int hwirq, struct pt_regs *regs)
 {
-	struct pt_regs *old_regs = set_irq_regs(regs);
-
-	irq_enter();
-	generic_handle_irq(irq);
-	irq_exit();
-	set_irq_regs(old_regs);
+	handle_domain_irq(NULL, hwirq, regs);
 }