From a45d575f53c9ed2926840377e59aa19e2024ee87 Mon Sep 17 00:00:00 2001 From: Robin Getz Date: Wed, 7 Jan 2009 23:14:38 +0800 Subject: Blackfin arch: Add basic irq stack checking for Blackfin Signed-off-by: Robin Getz Signed-off-by: Bryan Wu --- arch/blackfin/kernel/irqchip.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'arch/blackfin/kernel/irqchip.c') diff --git a/arch/blackfin/kernel/irqchip.c b/arch/blackfin/kernel/irqchip.c index 5ad07525ea3..1624e112968 100644 --- a/arch/blackfin/kernel/irqchip.c +++ b/arch/blackfin/kernel/irqchip.c @@ -120,7 +120,21 @@ asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs) 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 -- cgit v1.2.3