powerpc/irq: Move stack overflow check into a separate function

Makes do_IRQ() shorter and clearer.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 3d3658d..463b6ab 100644 (file)
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -301,6 +301,22 @@ static inline void handle_one_irq(unsigned int irq)
 }
 #endif
 
+static inline void check_stack_overflow(void)
+{
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+       long sp;
+
+       sp = __get_SP() & (THREAD_SIZE-1);
+
+       /* check for stack overflow: is there less than 2KB free? */
+       if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
+               printk("do_IRQ: stack overflow: %ld\n",
+                       sp - sizeof(struct thread_info));
+               dump_stack();
+       }
+#endif
+}
+
 void do_IRQ(struct pt_regs *regs)
 {
        struct pt_regs *old_regs = set_irq_regs(regs);
@@ -308,20 +324,7 @@ void do_IRQ(struct pt_regs *regs)
 
        irq_enter();
 
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
-       /* Debugging check for stack overflow: is there less than 2KB free? */
-       {
-               long sp;
-
-               sp = __get_SP() & (THREAD_SIZE-1);
-
-               if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
-                       printk("do_IRQ: stack overflow: %ld\n",
-                               sp - sizeof(struct thread_info));
-                       dump_stack();
-               }
-       }
-#endif
+       check_stack_overflow();
 
        /*
         * Every platform is required to implement ppc_md.get_irq.