linux-kernel - [patch] espfix cleanup take 3

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Date:	Sat, 30 Sep 2006 22:18:03 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	zach@...are.com, linux-kernel@...r.kernel.org,
	Chuck Ebbert <76306.1226@...puserve.com>,
	Jan Beulich <JBeulich@...ell.com>
Subject: [patch] espfix cleanup take 3

Hello.

Andrew Morton wrote:
> Ho hum, this conflicts moderately with the hypervisor preparatory patches
> which Jeremy sent.
> So could I ask that you redo this patch in a couple of weeks time against
> the current -mm lineup?
Done.

The attached patch cleans up the espfix code:
- Introduced PER_CPU() macro to be used from asm
- Introduced GET_DESC_BASE() macro to be used from asm
- Rewrote the fixup code in asm, as calling a C code with the altered %ss
  appeared to be unsafe
- No longer altering the stack from a .fixup section
- 16bit per-cpu stack is no longer used, instead the stack segment base
  is patched the way so that the high word of the kernel and user %esp
  are the same.
- Added the limit-patching for the espfix segment. (Chuck Ebbert)

Signed-off-by: Stas Sergeev <stsp@...et.ru>
Acked-by: Zachary Amsden <zach@...are.com>
Acked-by: Chuck Ebbert <76306.1226@...puserve.com>
Acked-by: Jan Beulich <jbeulich@...ell.com>


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