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I compiled the latest Linux 6.6.9 kernel from source and after installation, when I run cat /boot/config-$(uname -r), I get an error: cat: /boot/config-6.6.9: No such file or directory. The config file is missing. For the installation, I just copied the previous kernel config in the new kernel source code directory (using cp -v /boot/config-$(uname -r) .config) before compiling it, then configured it with make menuconfig, ran make, make modules_install, and make install. I have the config files for the previous kernels though. What could be the reason?

OS: AlmaLinux 9.3 x86-64

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The reason is that make install doesn’t install the kernel configuration in /boot. If you want to preserve it, you’ll have to copy it manually, or perhaps use one of the targets that builds a package (make rpm-pkg in your case; but I haven’t checked whether it packages the configuration).

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  • Is there any way I can grep for the enabled kernel options if not using the original .config file I used for configuring the kernel?
    – kataba
    Commented Jan 5 at 13:17
  • If you enable IKCONFIG_PROC when building your kernel, you’ll be able to see the running kernel’s configuration in /proc/config.gz.
    – Stephen Kitt
    Commented Jan 5 at 14:10

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