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107 points

Linux only needs a reboot if you want to update the kernel, normally.

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39 points

but in that case you can often kexec to restart linux faster, skipping the actual BIOS/UEFI boot.

also, some distros offer live patching of kernel code for $$$

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19 points
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You don’t need to pay money for live patching.
They really just make you pay for having them do it for you.

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4 points

I think you forgot to mention what distro you are running.

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2 points

Eh, it depends. Other low-level things (systemd, glibc, etc) need a reboot too.

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1 point

Technically, but it’s safer to reboot nonetheless: https://fedoramagazine.org/offline-updates-and-fedora-35/

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