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Suppose that:

  • any kernel configuration regarding initramfs (loading external initramfs support and compression)
  • No RAID or lvm used
  • rootfs uses ext4

Is it really necessary to generate a new initramfs after I recompile the same kernel?

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  • 1
    Fully modular kernel and all dependencies resolved by Initramfs generator is the common approach. Alternative approach like Custom Initramfs, it's possible with non-modular kernel, or by providing dependencies in a separate file; it's just very uncommon. Feb 4, 2021 at 14:11

1 Answer 1

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The initramfs contains kernel modules; so if anything has changed in the modules included in your initramfs, you need to generate a new one.

Other than that, for the same kernel version, no, you shouldn’t need to generate a new initramfs if you already have one.

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  • I extracted the initramfs-5.*.image and found it only contains 4 modules while my /lib/modules contains 172 modules. Does this mean that as long as that 4 modules aren't changed, I don't need to update initramfs?
    – JiaHao Xu
    Feb 4, 2021 at 14:23
  • 1
    Yup, that’s right. Feb 4, 2021 at 14:28
  • Thx for the clearification.
    – JiaHao Xu
    Feb 4, 2021 at 14:30

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