Jesper Juhl wrote:
On 11/23/05, Bill Davidsen <[email protected]> wrote:
Ashutosh Naik wrote:
Hi,
I made e1000 ( or for that matter anything) a part of the 2.6.15-rc1
kernel and booted the kernel. Next I compiled e1000 as a module (
e1000.ko ), and tried to insmod it into the kernel( which already had
e1000 a compiled as a part of the kernel). I observed that
/proc/kallsyms contained two copies of all the symbols exported by
e1000, and I also got a Kernel Panic on the way.
Is this behaviour natural and desirable ?
No, trying to insert a module into a kernel built with the functionality
compiled in is a vile perverted act, and probably illegal in Republican
states! ;-)
The other day I mentioned that reiser4 will find bugs because people
will do bizarre things with it when it is more widely used. I think you
have hit a "no one would ever do that" bug in the module loader, and
demonstrated my point in the process.
The panic isn't desirable, but I'm not sure what "correct behaviour"
would be, I can't imagine that this is intended to work. The issues of
removing such a module gracefully are significant.
Wouldn't the desired behaviour be that when the kernel attempts to
load a module it checks if it is already present build-in and if so
simply refuse to load it at all?
It doesn't look to be quite as easy to check for built-in as to check
for "already loaded" without some global state tracking, and handling
the case where it just wasn't built at all, and may have other stuff
missing. Add to this not breaking existing out of tree code and the
implementation looks like a non-trivial exercise.
--
-bill davidsen ([email protected])
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me
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