linux-kernel - Re: [PATCH] Configure out doublefault exception handler (Linux Tiny)

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Message-ID: <20080212130428.GA32757@uranus.ravnborg.org>
Date:	Tue, 12 Feb 2008 14:04:28 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Thomas Petazzoni <thomas.petazzoni@...x.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Anvin" <hpa@...or.com>, Matt Mackall <mpm@...enic.com>,
	Linux-tiny@...enic.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Configure out doublefault exception handler (Linux Tiny)

On Tue, Feb 12, 2008 at 11:08:25AM +0100, Thomas Petazzoni wrote:
> Hi,
> 
> Enclosed patch allows to configure out the doublefault exception
> handler. The original patch of Matt Mackall added the option in
> init/Kconfig, but because this is a x86-specific thing, I thought
> arch/x86/Kconfig would be a better place. Is that correct ?
> 
> This patch applies on top on the DMI scanning code patch I've sent
> yesterday, because the DOUBLEFAULT config option is right after the DMI
> config option. Is that ok, or should I propose a patch on top of a
> vanilla 2.6.25-rc1 ?
> 
> Thanks for your review and comments,

We already have this in arch/x86/Kconfig.debug:

config DOUBLEFAULT
        default y
        bool "Enable doublefault exception handler" if EMBEDDED
        depends on X86_32
        help
          This option allows trapping of rare doublefault exceptions that
          would otherwise cause a system to silently reboot. Disabling this
          option saves about 4k and might cause you much additional grey
          hair.


It may need a small update if this is valid for both 32 and 64 bit.

	Sam
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