patches.kzm9g/0157-ARM-7123-1-smp-Add-an-IPI-handler-callable-from-C-co.patch

From 32e451b349e7eb7f702b46dd50e57585b0471889 Mon Sep 17 00:00:00 2001
From: Shawn Guo <shawn.guo@linaro.org>
Date: Thu, 6 Oct 2011 15:18:14 +0100
Subject: ARM: 7123/1: smp: Add an IPI handler callable from C code

In order to be able to handle IPI directly from C code instead of
assembly code, introduce handle_IPI(), which is modeled after handle_IRQ().

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
(cherry picked from commit 0b5a1b95dcdfa451125132d5ce3f79a27ffb0950)

Signed-off-by: Simon Horman <horms@verge.net.au>
---
 arch/arm/include/asm/smp.h |    5 +++++
 arch/arm/kernel/smp.c      |    5 +++++
 2 files changed, 10 insertions(+)

--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -33,6 +33,11 @@ extern void show_ipi_list(struct seq_fil
 asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
 
 /*
+ * Called from C code, this handles an IPI.
+ */
+void handle_IPI(int ipinr, struct pt_regs *regs);
+
+/*
  * Setup the set of possible CPUs (via set_cpu_possible)
  */
 extern void smp_init_cpus(void);
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -586,6 +586,11 @@ static void ipi_cpu_stop(unsigned int cp
  */
 asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
 {
+	handle_IPI(ipinr, regs);
+}
+
+void handle_IPI(int ipinr, struct pt_regs *regs)
+{
 	unsigned int cpu = smp_processor_id();
 	struct pt_regs *old_regs = set_irq_regs(regs);