re: CVS commit: src/sys

[matthew green <mrg%eterna.com.au@localhost>]

> Module Name:  src
> Committed By: rmind
> Date:         Thu Feb 17 18:32:29 UTC 2011
> 
> Modified Files:
>       src/sys/conf: files
>       src/sys/sys: cpu_data.h lwp.h
> Added Files:
>       src/sys/kern: subr_pcu.c
>       src/sys/sys: pcu.h
> 
> Log Message:
> Add PCU (Per-CPU Unit) - an interface to manage synchronization of any
> per CPU context tied with an LWP.  Main use - lazy FPU handling on SMP.
> 
> Requested by matt@, will be used on mips64.  Note: implementation will
> be improved to use IPIs before adopting on x86.  OK ad@.

why is this compiled on every port when no one uses it yet and most
of them never will?


.mrg.