git: 866c8b8d5ddb - main - kldload(8): Add note about using kld_list in rc.conf(5)

[Eugene Grosbein]

08.02.2021 14:12, Warner Losh wrote:
> 
> 
> On Mon, Feb 8, 2021, 12:05 AM Daniel Ebdrup Jensen <debdrup at freebsd.org <mailto:debdrup at freebsd.org>> wrote:
> 
>     The branch main has been updated by debdrup (doc committer):
> 
>     URL: https://cgit.FreeBSD.org/src/commit/?id=866c8b8d5ddb982c2b8139153a4ddfdb2aac3364
> 
>     commit 866c8b8d5ddb982c2b8139153a4ddfdb2aac3364
>     Author:     Daniel Ebdrup Jensen <debdrup at FreeBSD.org>
>     AuthorDate: 2021-02-08 06:49:32 +0000
>     Commit:     Daniel Ebdrup Jensen <debdrup at FreeBSD.org>
>     CommitDate: 2021-02-08 06:57:36 +0000
> 
>         kldload(8): Add note about using kld_list in rc.conf(5)
> 
>         While here, also recommend that loader.conf(5) should only be used in
>         order to get to mountroot, as rc(8) is less fragile, faster, and is
>         easier to fix by booting to single-user mode instead of having to
>         blacklist modules in the loader.
> 
> 
> I'm not sure this is good advice. The only modules that are fragile are 3rd party things like drm. It's no less hard to fix by unloading in the loader or fixing in single user. The speed difference is true, but unless the modules are huge, it isn't much.

+1

Plus, Daniel missed two other points: nextboot(8) facility that works with modules
loaded with the loader; and possibility to point to alternative location of kernel module
with *_name variable documented in the loader.conf(5) manual page.

The latter makes it possible to load alternative version of same driver,
real example is if_em.ko from base system vs. one from ports that has different code base
and set of bugs/features.

kld_list cannot do that.