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Date:   Fri, 1 Jan 2021 12:51:13 +0800
From:   Hongyi Zhao <hongyi.zhao@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Generate the config file for kernel compilation non-interactively in script.

Hi,

I want to build the realtime Linux for ROS 2 according to the
guidelines here:
<https://index.ros.org/doc/ros2/Tutorials/Building-Realtime-rt_preempt-kernel-for-ROS-2/>.

For this purpose, I must enable the rt_preempt relative options in the
kernel withe the following method interactively:

$ make menuconfig

and set the following

# Enable CONFIG_PREEMPT_RT
 -> General Setup
  -> Preemption Model (Fully Preemptible Kernel (Real-Time))
   (X) Fully Preemptible Kernel (Real-Time)

# Enable CONFIG_HIGH_RES_TIMERS
 -> General setup
  -> Timers subsystem
   [*] High Resolution Timer Support

# Enable CONFIG_NO_HZ_FULL
 -> General setup
  -> Timers subsystem
   -> Timer tick handling (Full dynticks system (tickless))
    (X) Full dynticks system (tickless)

# Set CONFIG_HZ_1000 (note: this is no longer in the General Setup
menu, go back twice)
 -> Processor type and features
  -> Timer frequency (1000 HZ)
   (X) 1000 HZ

# Set CPU_FREQ_DEFAULT_GOV_PERFORMANCE [=y]
 ->  Power management and ACPI options
  -> CPU Frequency scaling
   -> CPU Frequency scaling (CPU_FREQ [=y])
    -> Default CPUFreq governor (<choice> [=y])
     (X) performance

But this is very inconvenient for doing the above job in script. Is
there an alternative method to generate the above configurations for
kernel compilation  non-interactively in script.

BR,
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@...il.com>
Theory and Simulation of Materials
Hebei Polytechnic University of Science and Technology engineering
NO. 552 North Gangtie Road, Xingtai, China

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