linux-kernel - Re: [PATCH v1 1/1] Add kernel parameter for kernel version

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Message-ID: <CAFLxGvy7V77BCNSFRM4ZahN2oQW7n5dEoGPBtdNtjduOF-18nA@mail.gmail.com>
Date:	Fri, 6 Jun 2014 01:06:21 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	eric ernst <eric.ernst@...ux.intel.com>
Cc:	Randy Dunlap <rdunlap@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Josh Boyer <jwboyer@...oraproject.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] Add kernel parameter for kernel version

On Fri, Jun 6, 2014 at 12:56 AM, eric ernst <eric.ernst@...ux.intel.com> wrote:
>
> On 14-06-05 03:29 PM, Randy Dunlap wrote:
>>
>> On 06/05/2014 03:15 PM, eric ernst wrote:
>>>
>>> On 14-06-05 03:16 PM, Andrew Morton wrote:
>>>>
>>>> On Thu,  5 Jun 2014 15:09:17 -0700 eric.ernst@...ux.intel.com wrote:
>>>>
>>>>> Create a kernel cmdline parameter, "version_addendum", which can be
>>>>> used to add text to the kernel version that is reported from
>>>>> /proc/version.
>>>>
>>>> why?
>>>
>>> We have a need to keep a single product binary (kernel) across multiple
>>> android devices.  A subset of these platforms are looking for extra
>>> versioning information appended to it, accessible via /proc/version.  Rather
>>> than build multiple otherwise identical kernels with only this extended
>>> versioning as differentiation, we are looking to make this a command line
>>> parameter.  Understandable if there isn't enough value-add for the community
>>> in this patch, but I figured I'd give the patch a shot, as we need this
>>> functionality locally.  Thanks.
>>
>> Please use a newline character every 70-72 characters instead of assuming
>> that all email programs will break that extra long line up into a readable
>> format.  (mine does not.)
>
> Ack - sorry Randy - it was a quick cp / paste from earlier in the thread.
>
>>
>> What software needs to know the version info?  how early does it run?
>> Could it get the version info from 'uname -r' instead of from
>> /proc/version?
>>
>> thanks,
>
> This'll end up being used by a third party customer for tracking particular
> devices, so I'm sure "much, much later" in user space. While I'm sure they
> could use uname instead, the specific request was for /proc/version.


sandpuppy:/home/rw # echo "Windows" > /tmp/version
sandpuppy:/home/rw # mount --bind /tmp/version /proc/version
sandpuppy:/home/rw # cat /proc/version
Windows

-- 
Thanks,
//richard
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