From: Tejun Heo <tj@kernel.org>
Date: Mon, 9 Feb 2009 13:17:40 +0000 (+0900)
Subject: x86: add %gs accessors for x86_32
X-Git-Tag: v2.6.30-rc1~2^2~50^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9a89a26e02ef9ed03f74a755a8b4d8f3a066622;p=pandora-kernel.git

x86: add %gs accessors for x86_32

Impact: cleanup

On x86_32, %gs is handled lazily.  It's not saved and restored on
kernel entry/exit but only when necessary which usually is during task
switch but there are few other places.  Currently, it's done by
calling savesegment() and loadsegment() explicitly.  Define
get_user_gs(), set_user_gs() and task_user_gs() and use them instead.

While at it, clean up register access macros in signal.c.

This cleans up code a bit and will help future changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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