From: Jan Beulich <jbeulich@novell.com>
Date: Sat, 25 Mar 2006 15:29:25 +0000 (+0100)
Subject: [PATCH] x86_64: save FPU context slightly later
X-Git-Tag: v2.6.17-rc1~720
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=45948d7720e8bd0104696087c6305fdd90e3b298;p=pandora-kernel.git

[PATCH] x86_64: save FPU context slightly later

Touching of the floating point state in a kernel debugger must be
NMI-safe, specifically math_state_restore() must be able to deal with
being called out of an NMI context. In order to do that reliably, the
context switch code must take care to not leave a window open where
the current task's TS_USEDFPU flag and CR0.TS could get out of sync.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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