RE: Kernel versus patch version

Hi Uwe,

Thanks for your suggestion and feedback. Appreciated.

I will use the latest rt-patch with the 3.14.61 kernel. 

You made a good question regarding the use of the latest 4.4. I would like to use the latest stable version (as many other I guess), but I'm not sure about the support. I will re-check about it and perform some tests.

Thanks

Julio

-----Original Message-----
From: linux-rt-users-owner@vger.kernel.org [mailto:linux-rt-users-owner@vger.kernel.org] On Behalf Of Uwe Kleine-König
Sent: Sunday, February 28, 2016 3:48 AM
To: Julio Cruz Barroso
Cc: linux-rt-users@vger.kernel.org; otavio.salvador@ossystems.com.br
Subject: Re: Kernel versus patch version

Hello,

On Sat, Feb 27, 2016 at 01:48:41PM +0000, Julio Cruz Barroso wrote:

I'm trying to understand how to fit a kernel version with a RT patch. 

In summary, I'm working with a kernel version of 3.14.52 (released by 
Freescale for the iMX6 family) and I'm not sure about the criteria to 
choose the RT patch version.

Is there a good reason to stick to 3.14? If not, better use 4.4. If however there is a good reason, double check it is really good. Usually you don't want to use the Freescale vendor kernel but a vanilla kernel.
Usually the latter has much better quality and the i.MX6 support is also good.

The WIKI [1] mention that we need to make sure that the RT-Preempt 
version fits the kernel version we intend to use. For example, if we 
have a kernel version 3.x.y (without z or security or bug fixes), the 
RT path must be "patches-3.x.y-rtxx", where xx is the RT patch 
release.

The RT patch repository [2] doesn't contain a release that fit the
3.14.52 kernel.

Considering this context, I have a some questions:

- Which revision could be more convenient for the 3.14.52 kernel?
- Can I use a different RT patch release that differ on the .y number
  (3.x.y)? 

It might work, but you probably have to resolve some conflicts. And given there is a 3.14.62 you shouldn't use 3.14.52 any more.

- Must I need to patch the kernel to 3.14.61 and use the latest RT
  patch release by Steve [3] some days ago? 

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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