linux-kernel - Re: [RFC PATCH 0/5] x86: check stack overflows more reliably

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Date:	Mon, 7 Nov 2011 09:00:05 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Mitsuo Hayasaka <mitsuo.hayasaka.hu@...achi.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Randy Dunlap <rdunlap@...otime.net>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [RFC PATCH 0/5] x86: check stack overflows more reliably

On Mon, Nov 7, 2011 at 7:51 AM, Mitsuo Hayasaka
<mitsuo.hayasaka.hu@...achi.com> wrote:
> (2) check stack overflow in detail
>    Currently, only kernel stack is checked for the overflow,
>    which is not sufficient for enterprise systems. To enhance
>    reliability, expand stack overflow checking to IRQ and
>    exception stacks optionally. This is disabled by default
>    in Kconfig.

This sounds useful. What's the reason for not enabling this by
default? Performance regressions?

                        Pekka
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