From: jia zhang Date: Sun, 23 Nov 2008 01:51:41 +0000 (+0800) Subject: x86_64: fix the check in stack_overflow_check X-Git-Tag: v2.6.29-rc1~587^2~4^6~6 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3aeb95d5b7839708a8d8e11aa274ee4d0d4042cc;p=karo-tx-linux.git x86_64: fix the check in stack_overflow_check Impact: make stack overflow debug check and printout narrower stack_overflow_check() should consider the stack usage of pt_regs, and thus it could warn us in advance. Additionally, it looks better for the warning time to start at INITIAL_JIFFIES. Assuming that rsp gets close to the check point before interrupt arrives: when interrupt really happens, thread_info will be partly overrode. Signed-off-by: jia zhang Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c index 60eb84eb77a0..b842fc82be15 100644 --- a/arch/x86/kernel/irq_64.c +++ b/arch/x86/kernel/irq_64.c @@ -29,11 +29,12 @@ static inline void stack_overflow_check(struct pt_regs *regs) { u64 curbase = (u64)task_stack_page(current); - static unsigned long warned = -60*HZ; + static unsigned long warned = INITIAL_JIFFIES - 60*HZ; if (regs->sp >= curbase && regs->sp <= curbase + THREAD_SIZE && - regs->sp < curbase + sizeof(struct thread_info) + 128 && - time_after(jiffies, warned + 60*HZ)) { + regs->sp < curbase + sizeof(struct thread_info) + + sizeof(struct pt_regs) + 128 && + time_after(jiffies, warned + 60*HZ)) { printk("do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n", current->comm, curbase, regs->sp); show_stack(NULL,NULL);