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

[Andi Kleen]

> It wouldn't take any additional memory at all.  Currently we have 8k
> of "debug" stack which is really two 4k pieces, and you're putting the
> kernel gs base in the bottom word.  I'm suggesting that you duplicate
> the kernel gs base at the bottom work and the bottom word + 4k.  We
> already have a hard limit of 4k of debug stack because of the IST
> shift mechanism -- it really is two separate 4k stacks, not one 8k
> stack.

Seems like a hack. What happens if we add an uneven number of stacks?

Just handling it in the code is simple enough.


-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/