Re: Bumping required kernels to 3.0 for Linux backports ?

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On Apr 10, 2014, at 10:04 AM, Arend van Spriel <arend@xxxxxxxxxxxx> wrote:

> On 04/10/14 18:59, Luis R. Rodriguez wrote:
>> On Thu, Apr 10, 2014 at 12:44 AM, Takashi Iwai<tiwai@xxxxxxx>  wrote:
>>> At Wed, 9 Apr 2014 14:06:13 -0700,
>>> Greg Kroah-Hartman wrote:
>>>> 
>>>> On Wed, Apr 09, 2014 at 01:52:29PM -0700, Luis R. Rodriguez wrote:
>>>>> On Wed, Apr 9, 2014 at 1:22 PM, Greg Kroah-Hartman
>>>>> <gregkh@xxxxxxxxxxxxxxxxxxx>  wrote:
>>>>>> On Wed, Apr 09, 2014 at 01:01:23PM -0700, Luis R. Rodriguez wrote:
>>>>>>> On Wed, Apr 9, 2014 at 12:12 PM, Greg Kroah-Hartman
>>>>>>> <gregkh@xxxxxxxxxxxxxxxxxxx>  wrote:
>>>>>>>> On Wed, Apr 09, 2014 at 11:28:55AM -0700, Luis R. Rodriguez wrote:
>>>>>>>>> On Wed, Apr 9, 2014 at 2:18 AM, Felix Fietkau<nbd@xxxxxxxxxxx>  wrote:
>>>>>>>>>> The oldest kernel in OpenWrt that we're still supporting with updates of
>>>>>>>>>> the backports tree is 3.3, so raising the minimum requirement to 3.0 is
>>>>>>>>>> completely fine with me.
>>>>>>>>> 
>>>>>>>>> OK note that 3.3 is not listed on kernel.org as supported. I'm fine in
>>>>>>>>> carrying the stuff for those for now but ultimately it'd also be nice
>>>>>>>>> if we didn't even have to test the kernels in between which are not
>>>>>>>>> listed. This does however raise the question of how often a kernel in
>>>>>>>>> between a list of supported kernels gets picked up to be supported
>>>>>>>>> eventually. Greg, Jiri, do you happen to know what the likelyhood of
>>>>>>>>> that can be?
>>>>>>>> 
>>>>>>>> I don't know of anything ever getting picked up after I have said it
>>>>>>>> would not be supported anymore.
>>>>>>> 
>>>>>>> Great! How soon after a release do you mention whether or not it will
>>>>>>> be supported? Like say, 3.14, which was just released.
>>>>>> 
>>>>>> I only mention it around the time that it would normally go end-of-life.
>>>>>> 
>>>>>> For example, if 3.13 were to be a release that was going to be "long
>>>>>> term", I would only say something around the normal time I would be no
>>>>>> longer supporting it.  Like in 2-3 weeks from now.
>>>>>> 
>>>>>> So for 3.14, I'll not say anything about that until 3.16-rc1 is out,
>>>>>> give or take a week or two.
>>>>>> 
>>>>>>> Also, as of late are you aware any distribution picking an unsupported
>>>>>>> kernel for their next choice of kernel?
>>>>>> 
>>>>>> Sure, lots do, as they don't line up with my release cycles (I only pick
>>>>>> 1 long term kernel to maintain each year).  Look at the Ubuntu releases
>>>>>> for examples of that.  Also openSUSE and Fedora (although Fedora does
>>>>>> rev their kernel pretty regularly) don't usually line up.  The
>>>>>> "enterprise" distros are different, but even then, they don't always
>>>>>> line up either (which is why Jiri is maintaining 3.12...)
>>>>>> 
>>>>>> Hope this helps,
>>>>> 
>>>>> It does! Unless I don't hear any complaints then given that some
>>>>> distributions might choose a kernel in between and given also your
>>>>> great documented story behind the gains on trying to steer folks
>>>>> together on the 'ol 2.6.32 [0] and this now being faded, I'll be
>>>>> bumping backports to only support>= 3.0 soon, but we'll include all
>>>>> the series from 3.0 up to the latest. That should shrink compile /
>>>>> test time / support time on backports to 1/2.
>>>> 
>>>> Why 3.0?  That's not supported by anyone anymore for "new hardware", I'd
>>>> move to 3.2 if you could, as that's the Debian stable release that will
>>>> be maintained for quite some time yet:
>>>>       https://www.kernel.org/category/releases.html
>>> 
>>> Well, the support for "new hardware" is what backports project itself
>>> does, isn't it?
>>> 
>>> Besides, SLES11 is still supported, so yes, including 3.0.x would be
>>> helpful.
>> 
>> That's two stakeholders for 3.0 -- but nothing is voiced for anything
>> older than that. Today I will rip the older kernels into oblivion.
>> Thanks for all the feedback!
> 
> Ok, I guess my voice was cracking when I mentioned 2.6.38 as being used over here. I am probably alone in that desert.
> 
> Regards,
> Arend

You’re not alone.  :)  We use 2.6.38 over here at Dropcam and use backports for the Bluetooth subsystem (and HCI UART driver).  

Many thanks to everybody involved — b	ackports is a really amazing project.

Cheers,
Loren Kirkby
Dropcam


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