[ARM] More sparse fixes

arch/arm/kernel/irq.c:998:26: warning: Using plain integer as NULL pointer
arch/arm/kernel/smp.c:145:25: warning: Using plain integer as NULL pointer
arch/arm/kernel/smp.c:362:5: warning: symbol 'smp_call_function_on_cpu' was not declared. Should it be static?
drivers/video/amba-clcd.c:521:12: warning: symbol 'amba_clcdfb_init' was not declared. Should it be static?

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 9def440..6f86d0a 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -995,7 +995,7 @@
 	struct proc_dir_entry *dir;
 	int irq;
 
-	dir = proc_mkdir("irq", 0);
+	dir = proc_mkdir("irq", NULL);
 	if (!dir)
 		return;
 
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index f65750a..f5fc57e 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -515,7 +515,7 @@
  *
  *  Bit 0 - Inter-processor function call
  */
-void do_IPI(struct pt_regs *regs)
+asmlinkage void do_IPI(struct pt_regs *regs)
 {
 	unsigned int cpu = smp_processor_id();
 	struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
diff --git a/drivers/video/amba-clcd.c b/drivers/video/amba-clcd.c
index 467a1d7..a3c2c45 100644
--- a/drivers/video/amba-clcd.c
+++ b/drivers/video/amba-clcd.c
@@ -518,7 +518,7 @@
 	.id_table	= clcdfb_id_table,
 };
 
-int __init amba_clcdfb_init(void)
+static int __init amba_clcdfb_init(void)
 {
 	if (fb_get_options("ambafb", NULL))
 		return -ENODEV;