Re: [PATCH 4/8] x86: Add support for rd/wr fs/gs base

[Andi Kleen]

> I think all of this stems from unfortunate naming.  DEBUG_STACK isn't
> one stack -- it's a debug stack *array*.  The IST shift mechanism
> means that we can use different entries in that array as our stacks
> depending on how deeply nested we are.

I still think it's a terrible idea.

> > Just handling it in the code is simple enough.
> 
> It seems to account for over half the asm diff.  I'm talking about the
> addition of approximately two lines of C and the removal of a huge
> chunk of the asm diff.

It's just adding offsets to the stack code. Nothing complicated.
It's also straight forward code. Far more preferable than your magic
overlapping stacks.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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