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Date: Sat, 11 Apr 2015 01:05:46 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Andi Kleen <andi@firstfloor.org>, Andi Kleen <ak@linux.intel.com>,
        X86 ML <x86@kernel.org>, Andrew Lutomirski <luto@kernel.org>,
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        Steven Rostedt <rostedt@goodmis.org>, Borislav Petkov <bp@alien8.de>,
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Subject: Re: [PATCH 4/8] x86: Add support for rd/wr fs/gs base
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> One might argue that this code serves no purpose, but it's there, so
> we had better keep our per-invocation usage of DEBUG_STACK within 4k.

Only if you run NKLD. I doubt KDB or GDB support nesting.
We can ask Jan if he still uses it.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.