[PATCH v3 TRIVIAL] ARM: Enable GICv2m on 32-bit virt machine

[Pavel Fedin]

qemu implementation of "virt" includes GICv2m. This commit allows to use
it also on ARM32 architecture.

msi.h is added because it is required by linux/msi.h
if CONFIG_GENERIC_MSI_IRQ_DOMAIN is defined. It gets enabled by the
following KConfig dependency chain:
ARM_GIC_V2M => PCI_MSI_IRQ_DOMAIN => GENERIC_MSI_IRQ_DOMAIN

drivers/irqchip/irq-gic-v2m.c: In function ‘gicv2m_compose_msi_msg’:
drivers/irqchip/irq-gic-v2m.c:100:2: warning: right shift count >= width
of type [enabled by default]
  msg->address_hi = (u32) (addr >> 32);
  ^

Signed-off-by: Pavel Fedin <p.fedin at samsung.com>
---
v2 => v3:
Fixed build warning in irq-gic-v2m.c

v1 => v2:
Added verbose explanation in commit message
---
 arch/arm/Kconfig              | 1 +
 arch/arm/include/asm/Kbuild   | 1 +
 drivers/irqchip/irq-gic-v2m.c | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 45df48b..1091025 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -815,6 +815,7 @@ config ARCH_VIRT
 	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
 	select ARM_AMBA
 	select ARM_GIC
+	select ARM_GIC_V2M if PCI_MSI
 	select ARM_PSCI
 	select HAVE_ARM_ARCH_TIMER
 
diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
index 3c4596d..01806f5 100644
--- a/arch/arm/include/asm/Kbuild
+++ b/arch/arm/include/asm/Kbuild
@@ -14,6 +14,7 @@ generic-y += local.h
 generic-y += local64.h
 generic-y += mcs_spinlock.h
 generic-y += msgbuf.h
+generic-y += msi.h
 generic-y += param.h
 generic-y += parport.h
 generic-y += poll.h
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index fdf7065..f76fc9a 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -97,7 +97,9 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 	struct v2m_data *v2m = irq_data_get_irq_chip_data(data);
 	phys_addr_t addr = v2m->res.start + V2M_MSI_SETSPI_NS;
 
+#ifdef CONFIG_ARM64
 	msg->address_hi = (u32) (addr >> 32);
+#endif
 	msg->address_lo = (u32) (addr);
 	msg->data = data->hwirq;
 }
-- 
2.4.4