[RFC PATCH v5] Documentation/arch: Add Documentation/arch-TODO

[Ingo Molnar]

(fixed the subject.)

So this is the final version for now:

 - add a fourth table

 - fix errors in earlier tables, in particular I missed some PowerPC 
   Kconfigs

 - introduce the '..' denotion (in the final table) to show features 
   that cannot be supported by an architecture due to hardware 
   dependencies:

		   gcov-profile-all:---------------.
				THP:--------.      |
		      irq-time-acct:-.      |      |
				     |      |      |
		----------------------------------------
		  alpha           | TODO | TODO | TODO |
		  arc             | TODO |  ..  | TODO |
		  arm             |  ok  |  ok  |  ok  |
		  arm64           | TODO |  ok  |  ok  |
		  avr32           | TODO |  ..  | TODO |
		  blackfin        | TODO |  ..  | TODO |
		  c6x             | TODO |  ..  | TODO |

   so in the 'THP' column, if an architecture could in theory support 
   THP, it's listed as 'TODO', if it cannot, it's listed as '..'.

Please let me know about errors in these tables, and I can also add 
more features/facilities as well if I missed any.

Thanks,

    Ingo

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