linux-kernel - Re: stack overflow on Sparc64

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Date:	Fri, 20 Jun 2008 20:37:15 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	David Miller <davem@...emloft.net>
cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	agk@...hat.com
Subject: Re: stack overflow on Sparc64

On Fri, 20 Jun 2008, David Miller wrote:

> From: Mikulas Patocka <mpatocka@...hat.com>
> Date: Fri, 20 Jun 2008 18:36:09 -0400 (EDT)
>
>> On Fri, 20 Jun 2008, David Miller wrote:
>>
>>> Yes for debugging and other things it has to stay.
>>
>> If you want it to stay, then it doesn't make sense to make functions
>> tail-call-friendly --- because it should not crash with or without
>> debugging.
>
> On the contrary, of course it makes sense to do so.
>
> When debugging is disabled, the kernel will run faster.
>
> We have to fix the stack usage in either case, but from a
> performance standpoint when debugging is disabled the
> tail-call friendly layout is still highly desirable.

I agree, but performance is different problem than stack overflows.

I put all the patches for this overflow problem here:
http://people.redhat.com/mpatocka/patches/kernel-stack-overflow

Mikulas
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