Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select Spectre v2 mitigation

[Jiri Kosina]

On Wed, 24 Jan 2018, Greg Kroah-Hartman wrote:

> But will Andi's patch work well for you?  Adding a MODULE_INFO() tag to 
> every module?  

Yes, that would work -- all the modules that get built in tree, or out of 
tree but with retpolined compiler, would have that marker that could be 
optionally checked for by the kernel.

> I just thought since you were already using modversions in enterprise 
> distros already, that adding it there would be the simplest.

The patch as-is introduces immediate modversion mismatch between 
retpolined kernel and non-retpolined module, making each and every one 
fail to load.

Thanks,

-- 
Jiri Kosina
SUSE Labs