Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751442Ab0HUG3B (ORCPT ); Sat, 21 Aug 2010 02:29:01 -0400 Received: from mail-px0-f174.google.com ([209.85.212.174]:51280 "EHLO mail-px0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751174Ab0HUG27 (ORCPT ); Sat, 21 Aug 2010 02:28:59 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer; b=ODIToE9HmHs/EYhG3LpLgMkOSg8KBRR+ciGZMY289SjiqOvu3KI8jF/owxMTzf3di7 JxEZyGHBmuc4OORJKFn9BtRJTGgkm0OKmIGt+YF34WOjDSyIefJjQM30nWHrPv7aH+46 c8lTvxgiYqgcfgbO6Ble1f2PEVTb8WWd7jsxU= From: jiang.adam@gmail.com 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, tglx@linutronix.de, mingo@elte.hu, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Adam Jiang Subject: [PATCH] mips: irq: add statckoverflow detection Date: Sat, 21 Aug 2010 15:31:33 +0900 Message-Id: <1282372293-30211-1-git-send-email-jiang.adam@gmail.com> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2023 Lines: 73 From: Adam Jiang Add stackoverflow detection to mips arch Signed-off-by: Adam Jiang --- 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..6334037 100644 --- a/arch/mips/kernel/irq.c +++ b/arch/mips/kernel/irq.c @@ -151,6 +151,22 @@ void __init init_IRQ(void) #endif } +static inline void check_stack_overflow(void) +{ +#ifdef CONFIG_DEBUG_STACKOVERFLOW + long sp; + + asm volatile("move %0, $sp" : "=r" (sp)); + sp = sp & (THREAD_SIZE-1); + + /* check for stack overflow: is there less then 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 +} /* * do_IRQ handles all normal device IRQ's (the special * SMP cross-CPU interrupts have their own specific @@ -159,6 +175,9 @@ 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(); -- 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/