linux-kernel - [patch] espfix cleanup take 2

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Message-ID: <44D0D643.6090108@aknet.ru>
Date:	Wed, 02 Aug 2006 20:43:47 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	Zachary Amsden <zach@...are.com>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: [patch] espfix cleanup take 2

Hi Andrew.

Attached is a new espfix cleanup patch.
- 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 32bit
stack is used, and the base is patched the way so that the
high word of the kernel and user %esp are the same.
- I think that the limit of regs->esp+THREAD_SIZE*2 is very
permissive too (and I don't want to mess with granularity),
so I left the default 4G limit, unless Zach will really
complain on that. :)

Signed-off-by: Stas Sergeev <stsp@...et.ru>
Acked-by: Zachary Amsden <zach@...are.com>


View attachment "espfcln2.diff" of type "text/x-patch" (11222 bytes)