[LITMUS^RT] The feature trace tool error

[Pratyush Patel]

Hello,

Furthering what Björn mentioned, here are the options which select it
automatically:

--------------------

Symbol: RELOCATABLE [=y]
  │ Type  : boolean
  │ Prompt: Build a relocatable kernel
  │   Location:
  │ (1) -> Processor type and features
  │   Defined at arch/x86/Kconfig:1921
  │   Selected by: EFI_STUB [=n] && EFI [=n] && !X86_USE_3DNOW [=n]

---------------------

You can quickly search this using '/' while running 'make menuconfig'.
Ubuntu's base configuration definitely makes things much more
complicated.... In my experience, it is better to start with a simpler
configuration such as by base Arch Linux, or simply use 'make
localmodconfig'.

Regards,
Pratyush

On Mon, Jul 4, 2016 at 11:56 AM, Björn Brandenburg <bbb at mpi-sws.org> wrote:
>
>> On 04 Jul 2016, at 11:46, shijunjie92 <shijunjie92 at gmail.com> wrote:
>> When I try to run the feature trace tool, I got the error 'could not open feathertrace device (/dev/litmus/sched_trace13): No such file or directory'.
>> Under the direction from 'http://stackoverflow.com/questions/22993077/litmus-rt-scheduling-traces', I am trying to disable the option 'Build a relocatable kernel'. But in my ubuntu system, this option is locked, which could not been disabled.
>> '-*- Build a relocatable kernel'.
>> So, what should I do?
>
> You have some other option enabled that force-selects the option 'Build a relocatable kernel’. You’ll first have to figure out which options unconditionally forces the option to be enabled, and then disable that option first. The Linux configuration system can be a bit complicated…
>
> If you are starting from an Ubuntu configuration, you usually have tons of options enabled that you don’t need for your particular machine. I typically try to get something more tailored to my machine with ‘make localmodconfig’ and then ‘make localyesconfig’. This makes it slightly easier to track down problematic options.
>
> - Björn
>
>
>
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