svn commit: r324609 - head/sys/sys

[Ian Lepore]

On Fri, 2017-10-13 at 20:31 +0000, Mateusz Guzik wrote:
> Author: mjg
> Date: Fri Oct 13 20:31:56 2017
> New Revision: 324609
> URL: https://svnweb.freebsd.org/changeset/base/324609
> 
> Log:
>   mtx: change MTX_UNOWNED from 4 to 0
>   
>   The value is spread all over the kernel and zeroing a register is
>   cheaper/shorter than setting it up to an arbitrary value.
>   
>   Reduces amd64 GENERIC-NODEBUG .text size by 0.4%.
>   
>   MFC after:	1 week
> 

If you MFC this, won't that break the ABI for modules compiled against
earlier versions of the branch?

Also, won't this trigger a need to recompile out of tree modules such
as video drivers, virtualbox, etc?  Does that need an UPDATING entry?

-- Ian