Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752098Ab0HZNQm (ORCPT ); Thu, 26 Aug 2010 09:16:42 -0400 Received: from mail-pz0-f46.google.com ([209.85.210.46]:57262 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751918Ab0HZNQh (ORCPT ); Thu, 26 Aug 2010 09:16:37 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=vlKvj+fX3w+8ask1jk/7sTORUHMXla+c5Y5lRF/NKvKZ1euSz3y8RlyJV9cY4ZEaTP WAasNVlEVt7bf/cuZbDOMjohjn5XSgAyRL0sb14InW41qn2UoCpX3h9kEJWVeg8Tp1gS wTIijIJ1ilwvcrT//k9QCdhzHKbjsgltMgckI= From: Adam Jiang To: ralf@linux-mips.org Cc: dmitri.vorobiev@movial.com, wuzhangjin@gmail.com, ddaney@caviumnetworks.com, peterz@infradead.org, fweisbec@gmail.com, tj@kernel.org, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Adam Jiang Subject: [PATCH] mips: irq: add stackoverflow detection Date: Thu, 26 Aug 2010 22:19:15 +0900 Message-Id: <1282828755-11953-1-git-send-email-jiang.adam@gmail.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1778 Lines: 62 Add stackoverflow detection to mips arch --- arch/mips/Kconfig.debug | 7 +++++++ arch/mips/kernel/irq.c | 19 +++++++++++++++++++ 2 files changed, 26 insertions(+), 0 deletions(-) diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug index 43dc279..f1a00a2 100644 --- a/arch/mips/Kconfig.debug +++ b/arch/mips/Kconfig.debug @@ -67,6 +67,13 @@ config CMDLINE_OVERRIDE Normally, you will choose 'N' here. +config DEBUG_STACKOVERFLOW + bool "Check for stack overflows" + depends on DEBUG_KERNEL + help + This option will cause messages to be printed if free stack space + drops below a certain limit. + config DEBUG_STACK_USAGE bool "Enable stack utilization instrumentation" depends on DEBUG_KERNEL diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c index c6345f5..8fdf79e 100644 --- a/arch/mips/kernel/irq.c +++ b/arch/mips/kernel/irq.c @@ -151,6 +151,25 @@ void __init init_IRQ(void) #endif } +#ifdef DEBUG_STACKOVERFLOW +static inline void check_stack_overflow(void) +{ + long sp; + + asm volatile("move %0, $sp" : "=r" (sp)); + sp = 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(); + } +} +#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 -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/