Re: [PATCH 1/1] x86/fpu: Allow clearcpuid= to clear several bits

[Andi Kleen]

> 
> I did wonder about that.   However, cmdline_find_option() is specifically documented as 
> 
>  * Find a non-boolean option (i.e. option=argument). In accordance with
>  * standard Linux practice, if this option is repeated, this returns the
>  * last instance on the command line.

Okay so would need a special version that uses the first and an option
to pass the cmdline string.

> 
> And since that appeared in 2017 I decided to stick with the new-fangled interface :)   This is a little-used feature; I'm not sure it's worth the effort of parsing the command line for the old style.  What do you think?

I'm not sure it's that little used.  We use it quite a bit for testing
and workarounds, and it might be that some of those are deployed.

-Andi