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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 <jia.zhang2008@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
jia zhang 2008-11-23 09:51:41 +08:00 committed by Ingo Molnar
parent ca9eed7613
commit 3aeb95d5b7
1 changed files with 4 additions and 3 deletions
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7
arch/x86/kernel/irq_64.c
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@ -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);