Merge branches 'irq-core-for-linus' and 'core-locking-for-linus' of git://git.kernel...

[pandora-kernel.git] / arch / mips / kernel / irq.c

diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index c6345f5..4f93db5 100644 (file)
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -151,6 +151,29 @@ void __init init_IRQ(void)
 #endif
 }
 
+#ifdef DEBUG_STACKOVERFLOW
+static inline void check_stack_overflow(void)
+{
+       unsigned long sp;
+
+       __asm__ __volatile__("move %0, $sp" : "=r" (sp));
+       sp &= THREAD_MASK;
+
+       /*
+        * Check for stack overflow: is there less than STACK_WARN free?
+        * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
+        */
+       if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
+               printk("do_IRQ: stack overflow: %ld\n",
+                      sp - sizeof(struct thread_info));
+               dump_stack();
+       }
+}
+#else
+static inline void check_stack_overflow(void) {}
+#endif
+
+
 /*
  * do_IRQ handles all normal device IRQ's (the special
  * SMP cross-CPU interrupts have their own specific
@@ -159,6 +182,7 @@ void __init init_IRQ(void)
 void __irq_entry do_IRQ(unsigned int irq)
 {
        irq_enter();
+       check_stack_overflow();
        __DO_IRQ_SMTC_HOOK(irq);
        generic_handle_irq(irq);
        irq_exit();