[ARM] Wrap calls to descriptor handlers

This is part of Thomas Gleixner's generic IRQ patch, which converts
ARM to use the generic IRQ subsystem.  Here, we wrap calls to
desc->handler() in an inline function, desc_handle_irq().  This
reduces the size of Thomas' patch since the changes become more
localised.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 6cf35f6..539b596 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -157,7 +157,7 @@
 			mask >>= 2;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;
@@ -172,7 +172,7 @@
 			desc = irq_desc + irq;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;
@@ -187,7 +187,7 @@
 			desc = irq_desc + irq;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;
@@ -203,7 +203,7 @@
 			desc = irq_desc + irq;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;
diff --git a/arch/arm/mach-pxa/lubbock.c b/arch/arm/mach-pxa/lubbock.c
index 6309853..923f6eb 100644
--- a/arch/arm/mach-pxa/lubbock.c
+++ b/arch/arm/mach-pxa/lubbock.c
@@ -84,7 +84,7 @@
 		if (likely(pending)) {
 			irq = LUBBOCK_IRQ(0) + __ffs(pending);
 			desc = irq_desc + irq;
-			desc->handle(irq, desc, regs);
+			desc_handle_irq(irq, desc, regs);
 		}
 		pending = LUB_IRQ_SET_CLR & lubbock_irq_enabled;
 	} while (pending);
diff --git a/arch/arm/mach-pxa/mainstone.c b/arch/arm/mach-pxa/mainstone.c
index 827b7b5..85fdb5b 100644
--- a/arch/arm/mach-pxa/mainstone.c
+++ b/arch/arm/mach-pxa/mainstone.c
@@ -72,7 +72,7 @@
 		if (likely(pending)) {
 			irq = MAINSTONE_IRQ(0) + __ffs(pending);
 			desc = irq_desc + irq;
-			desc->handle(irq, desc, regs);
+			desc_handle_irq(irq, desc, regs);
 		}
 		pending = MST_INTSETCLR & mainstone_irq_enabled;
 	} while (pending);