linux-kernel - Re: [PATCH v5] ramoops: use pstore interface

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Date:	Wed, 18 Jan 2012 14:16:02 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Tony Luck <tony.luck@...el.com>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] ramoops: use pstore interface

On Wed, Jan 18, 2012 at 2:06 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Tue, 17 Jan 2012 15:58:52 -0800
> Kees Cook <keescook@...omium.org> wrote:
>
>> --- a/drivers/char/Kconfig
>> +++ b/drivers/char/Kconfig
>> @@ -603,6 +603,7 @@ source "drivers/s390/char/Kconfig"
>>  config RAMOOPS
>>       tristate "Log panic/oops to a RAM buffer"
>>       depends on HAS_IOMEM
>> +     depends on PSTORE
>>       default n
>>       help
>>         This enables panic and oops messages to be logged to a circular
>
> I think this is the right thing to do, but boy I hate it.  You sit
> there wondering "wtf do I need to enable so I can use feature X".  I
> sometimes use menuconfig's search feature, other times go trawl the
> Kconfig files.  There should be a capability in Kconfig to just turn on
> the terminal feature, enabling any precondition features on the way.
> Everyone loves Kconfig.

Heh. Yeah, makes a lot of thing undiscoverable in menuconfig. Maybe
stuff should be greyed out instead of just disappearing.

>>  static int __exit ramoops_remove(struct platform_device *pdev)
>>  {
>> +#if 0
>> +     /* TODO(kees): We cannot unload ramoops since pstore doesn't support
>> +      * unregistering yet.
>> +      */
>
> Well that sucks.  Is pstore getting fixed?

Tony, any plans for changing this? I'm ready when it does! :)

Thanks,

-Kees

-- 
Kees Cook
ChromeOS Security
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