Having worked on built-in drivers which could be modularized, I am now
looking for modular drivers which could be built-in. Our policy is that
drivers which are not hardware-specific and are needed on a majority of
systems should be built into the kernel directly.
So I checked which modules were loaded on my 4 systems. After filtering
out hardware-specific modules, I am left with the following list:
ACPI and thermal drivers:
Block device drivers
Graphics helper drivers
If anyone has an opinion on whether these should be built into the
kernel or left as modules, this is the right time to discuss it. My
personal thoughts, with mostly x86 in mind:
* The ACPI button and processor drivers could be built-in. Most x86
systems use ACPI and they supposedly all have at least one processor and
one power button ;) And thermal_sys is selected by processor.
* While all my systems have an optical drive, I know they have
disappeared from many systems, both very small and very large ones, so
leaving cdrom and sr_mod as modules seems fine.
* I have no idea why/how sg is being loaded, it has no modalias and no
other module depend on it. But /dev/sd* nodes are created so it is
certainly useful. Hannes?
* No idea what the scsi_dh* modules are about either, no modalias and no
dependencies either. Hannes?
* With DRM/KMS being the norm now, I believe drm and drm_kms_helper
could be built-in, even though the former is quite large. drm selects
i2c-algo-bit, most (all?) DRM/KMS drivers use it. Even servers have
* I suppose fuse is only used on desktop machines by default, for gvfs,
so having it as a module seems OK.
* lockd and sunrpc are dependencies of nfs and nfsd. I suppose there are
many users out there who don't serve nor mount NFS shares so modules
* I think microcode could be unloaded after use, maybe for security
reasons it might even be preferable, or just because there is simply no
point in keeping it in memory. Thomas? Either way we should keep it
* For sound drivers, Takashi should know better than me. I suppose that
the rationale for having these modular is that servers have no sound
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