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As PHK points out [0] qsort was imported [1] into the kernel in 1995, it was simply never used for the boot process, but it is availible.

[0]: https://twitter.com/bsdphk/status/1659568675899228163

[1]: https://github.com/freebsd/freebsd-src/commit/d89a1b600fc071...

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Looks like the code to bubble-sort the SYSINIT objects was committed a few months BEFORE this kernel qsort code was committed (late Aug 1995 vs early Nov 1995).

So that's why the sort-SYSINIT objects code didn't use qsort.

I'd also guess that there were fewer SYSINIT objects to sort back in 1995 than today.

see ~line 150 of sys/kern/init_main.c in https://github.com/freebsd/freebsd-src/commit/2b14f991e64ebe...

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