Blackfin arch: Add basic irq stack checking for Blackfin
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
diff --git a/arch/blackfin/kernel/irqchip.c b/arch/blackfin/kernel/irqchip.c
index 5ad0752..1624e11 100644
--- a/arch/blackfin/kernel/irqchip.c
+++ b/arch/blackfin/kernel/irqchip.c
@@ -120,7 +120,21 @@
desc = &bad_irq_desc;
irq_enter();
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+ /* Debugging check for stack overflow: is there less than STACK_WARN free? */
+ {
+ long sp;
+ sp = __get_SP() & (THREAD_SIZE-1);
+
+ if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
+ dump_stack();
+ printk(KERN_EMERG "%s: possible stack overflow while handling irq %i "
+ " only %ld bytes free\n",
+ __func__, irq, sp - sizeof(struct thread_info));
+ }
+ }
+#endif
generic_handle_irq(irq);
/* If we're the only interrupt running (ignoring IRQ15 which is for