Re: [OBSOLETE?] CONFIG_PREEMPT_RT_FULL config parameter in 4.19?!


Zoran
 

> This never existed in the upstream kernel, only in -rt branches.
> It still exists in 4.19-rt.

Sure. The following is done by me:

git clone git://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git

Isn't this CIP RT-kernel real-time tree?

cd linux-cip
git checkout -b cip_v4.19.58-cip6 v4.19.58-cip6

make -j4 -k -s ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=build-arm omap2plus_defconfig

Please, check the folllowing:

Linux stretch 4.19.0-5-amd64 #1 SMP Debian 4.19.37-5 (2019-06-19) x86_64

vagrant@stretch:~/git-repos/linux-cip/build-arm$ pwd
/home/vagrant/git-repos/linux-cip/build-arm
vagrant@stretch:~/git-repos/linux-cip/build-arm$ ls -al .config
-rw-r--r-- 1 vagrant vagrant 148183 Jul 18 04:25 .config
vagrant@stretch:~/git-repos/linux-cip/build-arm$ cat .config | grep PREEMPT
CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
CONFIG_PREEMPTIRQ_TRACEPOINTS=y
# CONFIG_PREEMPTIRQ_EVENTS is not set
# CONFIG_PREEMPTIRQ_DELAY_TEST is not set
vagrant@stretch:~/git-repos/linux-cip/build-arm $

And, finally:

vagrant@stretch:~/git-repos/linux-cip$ pwd
/home/vagrant/git-repos/linux-cip
vagrant@stretch:~/git-repos/linux-cip$ ack CONFIG_PREEMPT_RT_FULL
vagrant@stretch:~/git-repos/linux-cip$

Hmmmmmm... Strange, isn't it??? Please, advise?

Thank you,
Zoran Stojsavljevic
_______


On Fri, Jul 19, 2019 at 3:58 PM Ben Hutchings <ben.hutchings@...> wrote:
On Fri, 2019-07-19 at 15:31 +0200, Zoran S wrote:
> Hello  Ben, Daniel,
>
> I started my own investigation about RT kernels, namely 4.19. I
> proceed very carefully over the kernel config parameters... BUt the
> last one I inspected today got me nowhere!?
>
> Seems, that the following config parameters are obsolete in 4.19:
> CONFIG_PREEMPT_RT_FULL
[...]

This never existed in the upstream kernel, only in -rt branches.  It
still exists in 4.19-rt.

Ben.

--
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
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