cvs commit: src/sys/modules Makefile

Brooks Davis brooks at
Tue Aug 3 10:05:43 PDT 2004

On Tue, Aug 03, 2004 at 12:39:06PM -0400, John Baldwin wrote:
> On Monday 02 August 2004 05:51 pm, Nate Lawson wrote:
> > Mark Murray wrote:
> > > Brooks Davis writes:
> > >>IMO this is a module system bug not a bug in any given module.  There's
> > >> no good reason for the system to succeed at loading a module that's
> > >> already there regardless of how it got there.  I don't understand the
> > >> module system well enough to know where the bug lies, but I believe the
> > >> DECLARE_MODULE statement provides more then enough information to avoid
> > >> duplicates.
> > >
> > > I'm looking to see if MODULE_VERSION() may fix this.
> >
> > The case where mem is compiled into the kernel and then an attempt is
> > made to load it as a module needs to be detected by looking for an
> > instance of the devclass.  See how acpi/legacy co-exist.  This is not
> > just a problem with the same module being loaded multiple times.
> mem is a dev_t aka struct cdev *, not a device_t.  There is no devclass.

Similarly, where I've seen this problem is pseudo network interfaces
which are nothing but ifnet entries.  This is why I think we need to
handle this in the module layer and stop requring hack in every driver.
I think peter's module code might fix some of this since I think we'll
get module registrations for static modules.

-- Brooks

Any statement of the form "X is the one, true Y" is FALSE.
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