Lucas De Marchi [off-list ref] writes:

On Tue, Aug 26, 2014 at 9:04 AM, Masami Hiramatsu
[off-list ref] wrote:

quoted

Hi,

Here is a pair of patches which adds --lockup option to
modprobe and libkmod.

As I sent a series of patches which removes stop_machine()
from module removal: https://lkml.org/lkml/2014/8/25/142
it also adds lockup option which lock up the module in
the kernel and makes it un-removable.

These patches enables us to use that option when loading
modules. Module lockup may be good for BIG SMP machines
since the kernel skips module refcounting if the module
is locked up :)

Anyway, this is not needed if the lockup option is dropped
from the series. I send this for testing.

Ok. I'm not sure it's clear... I'm waiting for feedback on the kernel
patches in order to proceed with any review here. I'm not really
convinced we want this option when loading a module.

Rusty, what do you think?

I'm not convinced, I asked him to drop that patch.  If we have
significant performance issues, we'll have to do something smarter I
think anyway.

Cheers,
Rusty.