linux-kernel - Re: [PATCH 3/3] mips: irq: add stackoverflow detection

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Date:	Thu, 26 Aug 2010 22:15:09 +0900
From:	Adam Jiang <jiang.adam@...il.com>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
Cc:	ralf@...ux-mips.org, dmitri.vorobiev@...ial.com,
	wuzhangjin@...il.com, ddaney@...iumnetworks.com,
	peterz@...radead.org, fweisbec@...il.com, tj@...nel.org,
	tglx@...utronix.de, mingo@...e.hu, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mips: irq: add stackoverflow detection

2010/8/26 Sergei Shtylyov <sshtylyov@...sta.com>:
> Hello.
>
> Adam Jiang wrote:
>
>> Add stackoverflow detection to mips arch
>
> [...]
>
>> diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
>> index c6345f5..75c584d 100644
>> --- a/arch/mips/kernel/irq.c
>> +++ b/arch/mips/kernel/irq.c
>> @@ -151,6 +151,25 @@ void __init init_IRQ(void)
>>  #endif
>>  }
>>  +#ifdef CONFIG_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)
>
>   You didn't even try to compile with the option disabled -- you've missed
> {}.

Thank your, Sergei.

This is my first patch. I realized I have to learn much to summit a
good patch. And yes, I have to pay more attention on my code. Anyway,
I will try to get a good patch and send it here again.

/Adam

>
>> +#endif
>> +
>>  /*
>>  * do_IRQ handles all normal device IRQ's (the special
>>  * SMP cross-CPU interrupts have their own specific
>
> WBR, Sergei
>
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