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sh: Fix occasional FPU register corruption under preempt.

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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>
This commit is contained in:
Paul Mundt
2008-03-26 19:02:47 +09:00
parent 05dda977f2
commit 9bbafce2ee
10 changed files with 25 additions and 14 deletions
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1
include/asm-sh/processor.h
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@@ -2,7 +2,6 @@
#define __ASM_SH_PROCESSOR_H
#include <asm/cpu-features.h>
#include <asm/fpu.h>
#ifndef __ASSEMBLY__
/*