From: Paul Mundt <lethal@linux-sh.org>
Date: Wed, 26 Mar 2008 10:02:47 +0000 (+0900)
Subject: sh: Fix occasional FPU register corruption under preempt.
X-Git-Tag: v2.6.25-rc8~3^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9bbafce2eec190ef7e44b0eb1095ba17ce6ad3af;p=pandora-kernel.git

sh: Fix occasional FPU register corruption under preempt.

Presently with preempt enabled there's the possibility to be preempted
after the TIF_USEDFPU test and the register save, leading to bogus
state post-__switch_to(). Use an explicit preempt_disable()/enable()
pair around unlazy_fpu()/clear_fpu() to avoid this. Follows the x86
change.

Reported-by: Takuo Koguchi <takuo.koguchi.sw@hitachi.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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