linux-kernel - Re: [PATCH] char drivers: Ram oops kernel configuration parameters

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Message-ID: <BANLkTi=avK-_SWwS938=oPuKRMq_5Ai3bw@mail.gmail.com>
Date:	Fri, 24 Jun 2011 12:49:24 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Mandeep Singh Baines <msb@...omium.org>
Cc:	Greg KH <gregkh@...e.de>, Sergiu Iordache <sergiu@...omium.org>,
	Valdis.Kletnieks@...edu, Andrew Morton <akpm@...ux-foundation.org>,
	Samo Pogacnik <samo_pogacnik@....net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Seiji Aguchi <seiji.aguchi@....com>,
	"Ahmed S. Darwish" <darwish.07@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] char drivers: Ram oops kernel configuration parameters

2011/6/24 Mandeep Singh Baines <msb@...omium.org>:
> On Thu, Jun 23, 2011 at 2:33 PM, Greg KH <gregkh@...e.de> wrote:
>> On Thu, Jun 23, 2011 at 01:43:49PM -0700, Sergiu Iordache wrote:
>>> On Thu, Jun 23, 2011 at 12:59 PM, <Valdis.Kletnieks@...edu> wrote:
>>> > On Thu, 23 Jun 2011 11:36:00 PDT, Sergiu Iordache said:
>>> > > Ramoops currently has module parameters for setting the configuration
>>> > > variables (ram start, ram size and dump oopses). This makes it difficult to
>>> > > configure when the module is compiled as a builtin.
>>> >
>>> > Can't you add 'ramoops.ram_start=128M ramoops.ram_size=64M' or similar
>>> > to your kernel cmdline?
>>>
>>> You can but the problem is that when you're using the module as a
>>> builtin managing the command line is harder than managing Kconfig
>>> files. Instead of having different platform dependent config files
>>> (which already exist in most of the cases) under source control you
>>> would have to have different scripts which run the kernel with
>>> different parameters.
>>
>> Then why not make the sysfs files writable?
>>
>
> We do use sysctl and sysfs for most of our tuning stuff.
>
> But in this case, you wouldn't be able to write the sysfs file until
> late in boot
> so an early crashed would be lost.
>
> Our command-line is pretty generic across targets. Even across archs.
>

Maybe using platform data? With archs with device tree support can be easy.

Marco
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