Re: [patch] i386: use thread_info flags for debug regs and IO bitmaps

[Linus Torvalds]

On Fri, 7 Jul 2006, Chuck Ebbert wrote:
>
> From: Stephane Eranian <eranian@xxxxxxxxxx>
> 
> Use thread info flags to track use of debug registers and IO bitmaps.
>  
> 	- add TIF_DEBUG to track when debug registers are active
>  	- add TIF_IO_BITMAP to track when I/O bitmap is used
>  	- modify __switch_to() to use the new TIF flags

Can you explain what the advantages of this are?

I don't see it. It's just creating new state to describe state that we 
already had, and as far as I can tell, it's just a way to potentially have 
more new bugs thanks to the new state getting out of sync with the old 
one?

		Linus
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