Re: [Xen-devel] Re: [PATCH] [vTPM] Not building vTPM frontend as module

[Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>]

On Wed, 2006-05-10 at 15:55 +0100, Keir Fraser wrote:
> Even if it is unsafe to unload the module, there is still enormous 
> benefit in allowing to build as a module as it allows the user to 
> choose whether or not to load it in the first place!
> 
> I suggest you add __unsafe(THIS_MODULE) to the end of your module_init 
> function, as we have done for netback and blkback. This will make it 
> impossible for the user to unload the module, and print a message to 
> the kernel log explaining why.

If a module_init() is present but a module_exit() is not then you cannot
unload the module.

(unless you enable CONFIG_MODULE_FORCE_UNLOAD and use rmmod's --force
option, in which case your kernel become tainted)

Ian.



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