Re: [PATCH] powerpc: SMT priority (PPR) save and restore

quoted

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Can you break this patch into a few parts that are easier to review than
one giant patch.  Start by adding the PPR ftr bits, then the extra space
in the paca, then the new macros, then use the new infrastructure.  I'm
sure you can get 5 or so patches which will be much easier to review.

Also this has been white space munged.  See here:
  http://patchwork.ozlabs.org/patch/170993/
All the #defines are broken.

Also, do you know what the impacts of this are on null syscall/page
faults etc on machines which need the PPR switched?  If it's big, we
might want to have this as a CONFIG option for those who don't care and
want the speed bump.

Thanks for your comments. Sure will split this patch in to 5/6 patches. 
With Anton's num_syscall test  -
http://ozlabs.org/~anton/junkcode/null_syscall.c, noticed 6% overhead.
As you suggested, will add CONFIG option for this feature. 

Eek.. 6%.. yes, definitely a CONFIG option then.

... maybe even a boot time option so we can turn it on and off easily
for distros.

Mikey